Sweden-Number/dlls/gdiplus/image.c

/*
 * Copyright (C) 2007 Google (Evan Stade)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <stdarg.h>

#define NONAMELESSUNION

#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "wingdi.h"

#define COBJMACROS
#include "objbase.h"
#include "olectl.h"
#include "ole2.h"

#include "initguid.h"
#include "wincodec.h"
#include "gdiplus.h"
#include "gdiplus_private.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);

#define PIXELFORMATBPP(x) ((x) ? ((x) >> 8) & 255 : 24)

static INT ipicture_pixel_height(IPicture *pic)
{
    HDC hdcref;
    OLE_YSIZE_HIMETRIC y;

    IPicture_get_Height(pic, &y);

    hdcref = GetDC(0);

    y = MulDiv(y, GetDeviceCaps(hdcref, LOGPIXELSY), INCH_HIMETRIC);
    ReleaseDC(0, hdcref);

    return y;
}

static INT ipicture_pixel_width(IPicture *pic)
{
    HDC hdcref;
    OLE_XSIZE_HIMETRIC x;

    IPicture_get_Width(pic, &x);

    hdcref = GetDC(0);

    x = MulDiv(x, GetDeviceCaps(hdcref, LOGPIXELSX), INCH_HIMETRIC);

    ReleaseDC(0, hdcref);

    return x;
}

GpStatus WINGDIPAPI GdipBitmapApplyEffect(GpBitmap* bitmap, CGpEffect* effect,
    RECT* roi, BOOL useAuxData, VOID** auxData, INT* auxDataSize)
{
    FIXME("(%p %p %p %d %p %p): stub\n", bitmap, effect, roi, useAuxData, auxData, auxDataSize);
    /*
     * Note: According to Jose Roca's GDI+ docs, this function is not
     * implemented in Windows's GDI+.
     */
    return NotImplemented;
}

GpStatus WINGDIPAPI GdipBitmapCreateApplyEffect(GpBitmap** inputBitmaps,
    INT numInputs, CGpEffect* effect, RECT* roi, RECT* outputRect,
    GpBitmap** outputBitmap, BOOL useAuxData, VOID** auxData, INT* auxDataSize)
{
    FIXME("(%p %d %p %p %p %p %d %p %p): stub\n", inputBitmaps, numInputs, effect, roi, outputRect, outputBitmap, useAuxData, auxData, auxDataSize);
    /*
     * Note: According to Jose Roca's GDI+ docs, this function is not
     * implemented in Windows's GDI+.
     */
    return NotImplemented;
}

static inline void getpixel_16bppGrayScale(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = *g = *b = row[x*2+1];
    *a = 255;
}

static inline void getpixel_16bppRGB555(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    WORD pixel = *((WORD*)(row)+x);
    *r = (pixel>>7&0xf8)|(pixel>>12&0x7);
    *g = (pixel>>2&0xf8)|(pixel>>6&0x7);
    *b = (pixel<<3&0xf8)|(pixel>>2&0x7);
    *a = 255;
}

static inline void getpixel_16bppRGB565(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    WORD pixel = *((WORD*)(row)+x);
    *r = (pixel>>8&0xf8)|(pixel>>13&0x7);
    *g = (pixel>>3&0xfc)|(pixel>>9&0x3);
    *b = (pixel<<3&0xf8)|(pixel>>2&0x7);
    *a = 255;
}

static inline void getpixel_16bppARGB1555(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    WORD pixel = *((WORD*)(row)+x);
    *r = (pixel>>7&0xf8)|(pixel>>12&0x7);
    *g = (pixel>>2&0xf8)|(pixel>>6&0x7);
    *b = (pixel<<3&0xf8)|(pixel>>2&0x7);
    if ((pixel&0x8000) == 0x8000)
        *a = 255;
    else
        *a = 0;
}

static inline void getpixel_24bppRGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = row[x*3+2];
    *g = row[x*3+1];
    *b = row[x*3];
    *a = 255;
}

static inline void getpixel_32bppRGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = row[x*4+2];
    *g = row[x*4+1];
    *b = row[x*4];
    *a = 255;
}

static inline void getpixel_32bppARGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = row[x*4+2];
    *g = row[x*4+1];
    *b = row[x*4];
    *a = row[x*4+3];
}

static inline void getpixel_32bppPARGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *a = row[x*4+3];
    if (*a == 0)
        *r = *g = *b = 0;
    else
    {
        *r = row[x*4+2] * 255 / *a;
        *g = row[x*4+1] * 255 / *a;
        *b = row[x*4] * 255 / *a;
    }
}

static inline void getpixel_48bppRGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = row[x*6+5];
    *g = row[x*6+3];
    *b = row[x*6+1];
    *a = 255;
}

static inline void getpixel_64bppARGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *r = row[x*8+5];
    *g = row[x*8+3];
    *b = row[x*8+1];
    *a = row[x*8+7];
}

static inline void getpixel_64bppPARGB(BYTE *r, BYTE *g, BYTE *b, BYTE *a,
    const BYTE *row, UINT x)
{
    *a = row[x*8+7];
    if (*a == 0)
        *r = *g = *b = 0;
    else
    {
        *r = row[x*8+5] * 255 / *a;
        *g = row[x*8+3] * 255 / *a;
        *b = row[x*8+1] * 255 / *a;
    }
}

GpStatus WINGDIPAPI GdipBitmapGetPixel(GpBitmap* bitmap, INT x, INT y,
    ARGB *color)
{
    BYTE r, g, b, a;
    BYTE *row;
    TRACE("%p %d %d %p\n", bitmap, x, y, color);

    if(!bitmap || !color ||
       x < 0 || y < 0 || x >= bitmap->width || y >= bitmap->height)
        return InvalidParameter;

    row = bitmap->bits+bitmap->stride*y;

    switch (bitmap->format)
    {
        case PixelFormat16bppGrayScale:
            getpixel_16bppGrayScale(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat16bppRGB555:
            getpixel_16bppRGB555(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat16bppRGB565:
            getpixel_16bppRGB565(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat16bppARGB1555:
            getpixel_16bppARGB1555(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat24bppRGB:
            getpixel_24bppRGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat32bppRGB:
            getpixel_32bppRGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat32bppARGB:
            getpixel_32bppARGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat32bppPARGB:
            getpixel_32bppPARGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat48bppRGB:
            getpixel_48bppRGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat64bppARGB:
            getpixel_64bppARGB(&r,&g,&b,&a,row,x);
            break;
        case PixelFormat64bppPARGB:
            getpixel_64bppPARGB(&r,&g,&b,&a,row,x);
            break;
        default:
            FIXME("not implemented for format 0x%x\n", bitmap->format);
            return NotImplemented;
    }

    *color = a<<24|r<<16|g<<8|b;

    return Ok;
}

static inline void setpixel_16bppGrayScale(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((WORD*)(row)+x) = (r+g+b)*85;
}

static inline void setpixel_16bppRGB555(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((WORD*)(row)+x) = (r<<7&0x7c00)|
                        (g<<2&0x03e0)|
                        (b>>3&0x001f);
}

static inline void setpixel_16bppRGB565(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((WORD*)(row)+x) = (r<<8&0xf800)|
                         (g<<3&0x07e0)|
                         (b>>3&0x001f);
}

static inline void setpixel_16bppARGB1555(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((WORD*)(row)+x) = (a<<8&0x8000)|
                        (r<<7&0x7c00)|
                        (g<<2&0x03e0)|
                        (b>>3&0x001f);
}

static inline void setpixel_24bppRGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    row[x*3+2] = r;
    row[x*3+1] = g;
    row[x*3] = b;
}

static inline void setpixel_32bppRGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((DWORD*)(row)+x) = (r<<16)|(g<<8)|b;
}

static inline void setpixel_32bppARGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    *((DWORD*)(row)+x) = (a<<24)|(r<<16)|(g<<8)|b;
}

static inline void setpixel_32bppPARGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    r = r * a / 255;
    g = g * a / 255;
    b = b * a / 255;
    *((DWORD*)(row)+x) = (a<<24)|(r<<16)|(g<<8)|b;
}

static inline void setpixel_48bppRGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    row[x*6+5] = row[x*6+4] = r;
    row[x*6+3] = row[x*6+2] = g;
    row[x*6+1] = row[x*6] = b;
}

static inline void setpixel_64bppARGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    UINT64 a64=a, r64=r, g64=g, b64=b;
    *((UINT64*)(row)+x) = (a64<<56)|(a64<<48)|(r64<<40)|(r64<<32)|(g64<<24)|(g64<<16)|(b64<<8)|b64;
}

static inline void setpixel_64bppPARGB(BYTE r, BYTE g, BYTE b, BYTE a,
    BYTE *row, UINT x)
{
    UINT64 a64, r64, g64, b64;
    a64 = a * 257;
    r64 = r * a / 255;
    g64 = g * a / 255;
    b64 = b * a / 255;
    *((UINT64*)(row)+x) = (a64<<48)|(r64<<32)|(g64<<16)|b64;
}

GpStatus WINGDIPAPI GdipBitmapSetPixel(GpBitmap* bitmap, INT x, INT y,
    ARGB color)
{
    BYTE a, r, g, b;
    BYTE *row;
    TRACE("bitmap:%p, x:%d, y:%d, color:%08x\n", bitmap, x, y, color);

    if(!bitmap || x < 0 || y < 0 || x >= bitmap->width || y >= bitmap->height)
        return InvalidParameter;

    a = color>>24;
    r = color>>16;
    g = color>>8;
    b = color;

    row = bitmap->bits + bitmap->stride * y;

    switch (bitmap->format)
    {
        case PixelFormat16bppGrayScale:
            setpixel_16bppGrayScale(r,g,b,a,row,x);
            break;
        case PixelFormat16bppRGB555:
            setpixel_16bppRGB555(r,g,b,a,row,x);
            break;
        case PixelFormat16bppRGB565:
            setpixel_16bppRGB565(r,g,b,a,row,x);
            break;
        case PixelFormat16bppARGB1555:
            setpixel_16bppARGB1555(r,g,b,a,row,x);
            break;
        case PixelFormat24bppRGB:
            setpixel_24bppRGB(r,g,b,a,row,x);
            break;
        case PixelFormat32bppRGB:
            setpixel_32bppRGB(r,g,b,a,row,x);
            break;
        case PixelFormat32bppARGB:
            setpixel_32bppARGB(r,g,b,a,row,x);
            break;
        case PixelFormat32bppPARGB:
            setpixel_32bppPARGB(r,g,b,a,row,x);
            break;
        case PixelFormat48bppRGB:
            setpixel_48bppRGB(r,g,b,a,row,x);
            break;
        case PixelFormat64bppARGB:
            setpixel_64bppARGB(r,g,b,a,row,x);
            break;
        case PixelFormat64bppPARGB:
            setpixel_64bppPARGB(r,g,b,a,row,x);
            break;
        default:
            FIXME("not implemented for format 0x%x\n", bitmap->format);
            return NotImplemented;
    }

    return Ok;
}

/* This function returns a pointer to an array of pixels that represents the
 * bitmap. The *entire* bitmap is locked according to the lock mode specified by
 * flags.  It is correct behavior that a user who calls this function with write
 * privileges can write to the whole bitmap (not just the area in rect).
 *
 * FIXME: only used portion of format is bits per pixel. */
GpStatus WINGDIPAPI GdipBitmapLockBits(GpBitmap* bitmap, GDIPCONST GpRect* rect,
    UINT flags, PixelFormat format, BitmapData* lockeddata)
{
    BOOL bm_is_selected;
    INT stride, bitspp = PIXELFORMATBPP(format);
    HDC hdc;
    HBITMAP hbm, old = NULL;
    BITMAPINFO *pbmi;
    BYTE *buff = NULL;
    UINT abs_height;
    GpRect act_rect; /* actual rect to be used */

    TRACE("%p %p %d %d %p\n", bitmap, rect, flags, format, lockeddata);

    if(!lockeddata || !bitmap)
        return InvalidParameter;

    if(rect){
        if(rect->X < 0 || rect->Y < 0 || (rect->X + rect->Width > bitmap->width) ||
          (rect->Y + rect->Height > bitmap->height) || !flags)
            return InvalidParameter;

        act_rect = *rect;
    }
    else{
        act_rect.X = act_rect.Y = 0;
        act_rect.Width  = bitmap->width;
        act_rect.Height = bitmap->height;
    }

    if(flags & ImageLockModeUserInputBuf)
        return NotImplemented;

    if(bitmap->lockmode)
        return WrongState;

    if (bitmap->bits && bitmap->format == format)
    {
        /* no conversion is necessary; just use the bits directly */
        lockeddata->Width = act_rect.Width;
        lockeddata->Height = act_rect.Height;
        lockeddata->PixelFormat = format;
        lockeddata->Reserved = flags;
        lockeddata->Stride = bitmap->stride;
        lockeddata->Scan0 = bitmap->bits + (bitspp / 8) * act_rect.X +
                            bitmap->stride * act_rect.Y;

        bitmap->lockmode = flags;
        bitmap->numlocks++;

        return Ok;
    }

    hbm = bitmap->hbitmap;
    hdc = bitmap->hdc;
    bm_is_selected = (hdc != 0);

    pbmi = GdipAlloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
    if (!pbmi)
        return OutOfMemory;
    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    pbmi->bmiHeader.biBitCount = 0;

    if(!bm_is_selected){
        hdc = CreateCompatibleDC(0);
        old = SelectObject(hdc, hbm);
    }

    /* fill out bmi */
    GetDIBits(hdc, hbm, 0, 0, NULL, pbmi, DIB_RGB_COLORS);

    abs_height = abs(pbmi->bmiHeader.biHeight);
    stride = pbmi->bmiHeader.biWidth * bitspp / 8;
    stride = (stride + 3) & ~3;

    buff = GdipAlloc(stride * abs_height);

    pbmi->bmiHeader.biBitCount = bitspp;

    if(buff)
        GetDIBits(hdc, hbm, 0, abs_height, buff, pbmi, DIB_RGB_COLORS);

    if(!bm_is_selected){
        SelectObject(hdc, old);
        DeleteDC(hdc);
    }

    if(!buff){
        GdipFree(pbmi);
        return OutOfMemory;
    }

    lockeddata->Width  = act_rect.Width;
    lockeddata->Height = act_rect.Height;
    lockeddata->PixelFormat = format;
    lockeddata->Reserved = flags;

    if(pbmi->bmiHeader.biHeight > 0){
        lockeddata->Stride = -stride;
        lockeddata->Scan0  = buff + (bitspp / 8) * act_rect.X +
                             stride * (abs_height - 1 - act_rect.Y);
    }
    else{
        lockeddata->Stride = stride;
        lockeddata->Scan0  = buff + (bitspp / 8) * act_rect.X + stride * act_rect.Y;
    }

    bitmap->lockmode = flags;
    bitmap->numlocks++;

    bitmap->bitmapbits = buff;

    GdipFree(pbmi);
    return Ok;
}

GpStatus WINGDIPAPI GdipBitmapSetResolution(GpBitmap* bitmap, REAL xdpi, REAL ydpi)
{
    TRACE("(%p, %.2f, %.2f)\n", bitmap, xdpi, ydpi);

    if (!bitmap || xdpi == 0.0 || ydpi == 0.0)
        return InvalidParameter;

    bitmap->image.xres = xdpi;
    bitmap->image.yres = ydpi;

    return Ok;
}

GpStatus WINGDIPAPI GdipBitmapUnlockBits(GpBitmap* bitmap,
    BitmapData* lockeddata)
{
    HDC hdc;
    HBITMAP hbm, old = NULL;
    BOOL bm_is_selected;
    BITMAPINFO *pbmi;

    TRACE("(%p,%p)\n", bitmap, lockeddata);

    if(!bitmap || !lockeddata)
        return InvalidParameter;

    if(!bitmap->lockmode)
        return WrongState;

    if(lockeddata->Reserved & ImageLockModeUserInputBuf)
        return NotImplemented;

    if(lockeddata->Reserved & ImageLockModeRead){
        if(!(--bitmap->numlocks))
            bitmap->lockmode = 0;

        GdipFree(bitmap->bitmapbits);
        bitmap->bitmapbits = NULL;
        return Ok;
    }

    if (!bitmap->bitmapbits)
    {
        /* we passed a direct reference; no need to do anything */
        bitmap->lockmode = 0;
        bitmap->numlocks = 0;
        return Ok;
    }

    hbm = bitmap->hbitmap;
    hdc = bitmap->hdc;
    bm_is_selected = (hdc != 0);

    pbmi = GdipAlloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    pbmi->bmiHeader.biBitCount = 0;

    if(!bm_is_selected){
        hdc = CreateCompatibleDC(0);
        old = SelectObject(hdc, hbm);
    }

    GetDIBits(hdc, hbm, 0, 0, NULL, pbmi, DIB_RGB_COLORS);
    pbmi->bmiHeader.biBitCount = PIXELFORMATBPP(lockeddata->PixelFormat);
    SetDIBits(hdc, hbm, 0, abs(pbmi->bmiHeader.biHeight),
              bitmap->bitmapbits, pbmi, DIB_RGB_COLORS);

    if(!bm_is_selected){
        SelectObject(hdc, old);
        DeleteDC(hdc);
    }

    GdipFree(pbmi);
    GdipFree(bitmap->bitmapbits);
    bitmap->bitmapbits = NULL;
    bitmap->lockmode = 0;
    bitmap->numlocks = 0;

    return Ok;
}

GpStatus WINGDIPAPI GdipCloneBitmapArea(REAL x, REAL y, REAL width, REAL height,
    PixelFormat format, GpBitmap* srcBitmap, GpBitmap** dstBitmap)
{
    BitmapData lockeddata_src, lockeddata_dst;
    int i;
    UINT row_size;
    Rect area;
    GpStatus stat;

    TRACE("(%f,%f,%f,%f,%i,%p,%p)\n", x, y, width, height, format, srcBitmap, dstBitmap);

    if (!srcBitmap || !dstBitmap || srcBitmap->image.type != ImageTypeBitmap ||
        x < 0 || y < 0 ||
        x + width > srcBitmap->width || y + height > srcBitmap->height)
    {
        TRACE("<-- InvalidParameter\n");
        return InvalidParameter;
    }

    if (format == PixelFormatDontCare)
        format = srcBitmap->format;

    area.X = roundr(x);
    area.Y = roundr(y);
    area.Width = roundr(width);
    area.Height = roundr(height);

    stat = GdipBitmapLockBits(srcBitmap, &area, ImageLockModeRead, format,
        &lockeddata_src);
    if (stat != Ok) return stat;

    stat = GdipCreateBitmapFromScan0(lockeddata_src.Width, lockeddata_src.Height,
        0, lockeddata_src.PixelFormat, NULL, dstBitmap);
    if (stat == Ok)
    {
        stat = GdipBitmapLockBits(*dstBitmap, NULL, ImageLockModeWrite,
            lockeddata_src.PixelFormat, &lockeddata_dst);

        if (stat == Ok)
        {
            /* copy the image data */
            row_size = (lockeddata_src.Width * PIXELFORMATBPP(lockeddata_src.PixelFormat) +7)/8;
            for (i=0; i<lockeddata_src.Height; i++)
                memcpy((BYTE*)lockeddata_dst.Scan0+lockeddata_dst.Stride*i,
                       (BYTE*)lockeddata_src.Scan0+lockeddata_src.Stride*i,
                       row_size);

            GdipBitmapUnlockBits(*dstBitmap, &lockeddata_dst);
        }

        if (stat != Ok)
            GdipDisposeImage((GpImage*)*dstBitmap);
    }

    GdipBitmapUnlockBits(srcBitmap, &lockeddata_src);

    if (stat != Ok)
    {
        *dstBitmap = NULL;
    }

    return stat;
}

GpStatus WINGDIPAPI GdipCloneBitmapAreaI(INT x, INT y, INT width, INT height,
    PixelFormat format, GpBitmap* srcBitmap, GpBitmap** dstBitmap)
{
    TRACE("(%i,%i,%i,%i,%i,%p,%p)\n", x, y, width, height, format, srcBitmap, dstBitmap);

    return GdipCloneBitmapArea(x, y, width, height, format, srcBitmap, dstBitmap);
}

GpStatus WINGDIPAPI GdipCloneImage(GpImage *image, GpImage **cloneImage)
{
    GpStatus stat = GenericError;

    TRACE("%p, %p\n", image, cloneImage);

    if (!image || !cloneImage)
        return InvalidParameter;

    if (image->picture)
    {
        IStream* stream;
        HRESULT hr;
        INT size;
        LARGE_INTEGER move;

        hr = CreateStreamOnHGlobal(0, TRUE, &stream);
        if (FAILED(hr))
            return GenericError;

        hr = IPicture_SaveAsFile(image->picture, stream, FALSE, &size);
        if(FAILED(hr))
        {
            WARN("Failed to save image on stream\n");
            goto out;
        }

        /* Set seek pointer back to the beginning of the picture */
        move.QuadPart = 0;
        hr = IStream_Seek(stream, move, STREAM_SEEK_SET, NULL);
        if (FAILED(hr))
            goto out;

        stat = GdipLoadImageFromStream(stream, cloneImage);
        if (stat != Ok) WARN("Failed to load image from stream\n");

    out:
        IStream_Release(stream);
        return stat;
    }
    else if (image->type == ImageTypeBitmap)
    {
        GpBitmap *bitmap = (GpBitmap*)image;
        BitmapData lockeddata_src, lockeddata_dst;
        int i;
        UINT row_size;

        stat = GdipBitmapLockBits(bitmap, NULL, ImageLockModeRead, bitmap->format,
            &lockeddata_src);
        if (stat != Ok) return stat;

        stat = GdipCreateBitmapFromScan0(lockeddata_src.Width, lockeddata_src.Height,
            0, lockeddata_src.PixelFormat, NULL, (GpBitmap**)cloneImage);
        if (stat == Ok)
        {
            stat = GdipBitmapLockBits((GpBitmap*)*cloneImage, NULL, ImageLockModeWrite,
                lockeddata_src.PixelFormat, &lockeddata_dst);

            if (stat == Ok)
            {
                /* copy the image data */
                row_size = (lockeddata_src.Width * PIXELFORMATBPP(lockeddata_src.PixelFormat) +7)/8;
                for (i=0; i<lockeddata_src.Height; i++)
                    memcpy((BYTE*)lockeddata_dst.Scan0+lockeddata_dst.Stride*i,
                           (BYTE*)lockeddata_src.Scan0+lockeddata_src.Stride*i,
                           row_size);

                GdipBitmapUnlockBits((GpBitmap*)*cloneImage, &lockeddata_dst);
            }

            if (stat != Ok)
                GdipDisposeImage(*cloneImage);
        }

        GdipBitmapUnlockBits(bitmap, &lockeddata_src);

        if (stat != Ok)
        {
            *cloneImage = NULL;
        }
        else memcpy(&(*cloneImage)->format, &image->format, sizeof(GUID));

        return stat;
    }
    else
    {
        ERR("GpImage with no IPicture or bitmap?!\n");
        return NotImplemented;
    }
}

GpStatus WINGDIPAPI GdipCreateBitmapFromFile(GDIPCONST WCHAR* filename,
    GpBitmap **bitmap)
{
    GpStatus stat;
    IStream *stream;

    TRACE("(%s) %p\n", debugstr_w(filename), bitmap);

    if(!filename || !bitmap)
        return InvalidParameter;

    stat = GdipCreateStreamOnFile(filename, GENERIC_READ, &stream);

    if(stat != Ok)
        return stat;

    stat = GdipCreateBitmapFromStream(stream, bitmap);

    IStream_Release(stream);

    return stat;
}

GpStatus WINGDIPAPI GdipCreateBitmapFromGdiDib(GDIPCONST BITMAPINFO* info,
                                               VOID *bits, GpBitmap **bitmap)
{
    DWORD height, stride;
    PixelFormat format;

    FIXME("(%p, %p, %p) - partially implemented\n", info, bits, bitmap);

    height = abs(info->bmiHeader.biHeight);
    stride = ((info->bmiHeader.biWidth * info->bmiHeader.biBitCount + 31) >> 3) & ~3;

    if(info->bmiHeader.biHeight > 0) /* bottom-up */
    {
        bits = (BYTE*)bits + (height - 1) * stride;
        stride = -stride;
    }

    switch(info->bmiHeader.biBitCount) {
    case 1:
        format = PixelFormat1bppIndexed;
        break;
    case 4:
        format = PixelFormat4bppIndexed;
        break;
    case 8:
        format = PixelFormat8bppIndexed;
        break;
    case 24:
        format = PixelFormat24bppRGB;
        break;
    default:
        FIXME("don't know how to handle %d bpp\n", info->bmiHeader.biBitCount);
        *bitmap = NULL;
        return InvalidParameter;
    }

    return GdipCreateBitmapFromScan0(info->bmiHeader.biWidth, height, stride, format,
                                     bits, bitmap);

}

/* FIXME: no icm */
GpStatus WINGDIPAPI GdipCreateBitmapFromFileICM(GDIPCONST WCHAR* filename,
    GpBitmap **bitmap)
{
    TRACE("(%s) %p\n", debugstr_w(filename), bitmap);

    return GdipCreateBitmapFromFile(filename, bitmap);
}

GpStatus WINGDIPAPI GdipCreateBitmapFromResource(HINSTANCE hInstance,
    GDIPCONST WCHAR* lpBitmapName, GpBitmap** bitmap)
{
    HBITMAP hbm;
    GpStatus stat = InvalidParameter;

    TRACE("%p (%s) %p\n", hInstance, debugstr_w(lpBitmapName), bitmap);

    if(!lpBitmapName || !bitmap)
        return InvalidParameter;

    /* load DIB */
    hbm = LoadImageW(hInstance, lpBitmapName, IMAGE_BITMAP, 0, 0,
                     LR_CREATEDIBSECTION);

    if(hbm){
        stat = GdipCreateBitmapFromHBITMAP(hbm, NULL, bitmap);
        DeleteObject(hbm);
    }

    return stat;
}

GpStatus WINGDIPAPI GdipCreateHBITMAPFromBitmap(GpBitmap* bitmap,
    HBITMAP* hbmReturn, ARGB background)
{
    GpStatus stat;
    HBITMAP result, oldbitmap;
    UINT width, height;
    HDC hdc;
    GpGraphics *graphics;
    BITMAPINFOHEADER bih;
    void *bits;
    TRACE("(%p,%p,%x)\n", bitmap, hbmReturn, background);

    if (!bitmap || !hbmReturn) return InvalidParameter;

    GdipGetImageWidth((GpImage*)bitmap, &width);
    GdipGetImageHeight((GpImage*)bitmap, &height);

    bih.biSize = sizeof(bih);
    bih.biWidth = width;
    bih.biHeight = height;
    bih.biPlanes = 1;
    bih.biBitCount = 32;
    bih.biCompression = BI_RGB;
    bih.biSizeImage = 0;
    bih.biXPelsPerMeter = 0;
    bih.biYPelsPerMeter = 0;
    bih.biClrUsed = 0;
    bih.biClrImportant = 0;

    hdc = CreateCompatibleDC(NULL);
    if (!hdc) return GenericError;

    result = CreateDIBSection(hdc, (BITMAPINFO*)&bih, DIB_RGB_COLORS, &bits,
        NULL, 0);

    if (result)
    {
        oldbitmap = SelectObject(hdc, result);

        stat = GdipCreateFromHDC(hdc, &graphics);
        if (stat == Ok)
        {
            stat = GdipGraphicsClear(graphics, background);

            if (stat == Ok)
                stat = GdipDrawImage(graphics, (GpImage*)bitmap, 0, 0);

            GdipDeleteGraphics(graphics);
        }

        SelectObject(hdc, oldbitmap);
    }
    else
        stat = GenericError;

    DeleteDC(hdc);

    if (stat != Ok && result)
    {
        DeleteObject(result);
        result = NULL;
    }

    *hbmReturn = result;

    return stat;
}

GpStatus WINGDIPAPI GdipConvertToEmfPlus(const GpGraphics* ref,
    GpMetafile* metafile, BOOL* succ, EmfType emfType,
    const WCHAR* description, GpMetafile** out_metafile)
{
    static int calls;

    TRACE("(%p,%p,%p,%u,%s,%p)\n", ref, metafile, succ, emfType,
        debugstr_w(description), out_metafile);

    if(!ref || !metafile || !out_metafile)
        return InvalidParameter;

    *succ = FALSE;
    *out_metafile = NULL;

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

/* FIXME: this should create a bitmap in the given size with the attributes
 * (resolution etc.) of the graphics object */
GpStatus WINGDIPAPI GdipCreateBitmapFromGraphics(INT width, INT height,
    GpGraphics* target, GpBitmap** bitmap)
{
    static int calls;
    GpStatus ret;

    if(!target || !bitmap)
        return InvalidParameter;

    if(!(calls++))
        FIXME("hacked stub\n");

    ret = GdipCreateBitmapFromScan0(width, height, 0, PixelFormat24bppRGB,
                                    NULL, bitmap);

    return ret;
}

GpStatus WINGDIPAPI GdipCreateBitmapFromHICON(HICON hicon, GpBitmap** bitmap)
{
    GpStatus stat;
    ICONINFO iinfo;
    BITMAP bm;
    int ret;
    UINT width, height;
    GpRect rect;
    BitmapData lockeddata;
    HDC screendc;
    BOOL has_alpha;
    int x, y;
    BYTE *bits;
    BITMAPINFOHEADER bih;
    DWORD *src;
    BYTE *dst_row;
    DWORD *dst;

    TRACE("%p, %p\n", hicon, bitmap);

    if(!bitmap || !GetIconInfo(hicon, &iinfo))
        return InvalidParameter;

    /* get the size of the icon */
    ret = GetObjectA(iinfo.hbmColor ? iinfo.hbmColor : iinfo.hbmMask, sizeof(bm), &bm);
    if (ret == 0) {
        DeleteObject(iinfo.hbmColor);
        DeleteObject(iinfo.hbmMask);
        return GenericError;
    }

    width = bm.bmWidth;

    if (iinfo.hbmColor)
        height = abs(bm.bmHeight);
    else /* combined bitmap + mask */
        height = abs(bm.bmHeight) / 2;

    bits = HeapAlloc(GetProcessHeap(), 0, 4*width*height);
    if (!bits) {
        DeleteObject(iinfo.hbmColor);
        DeleteObject(iinfo.hbmMask);
        return OutOfMemory;
    }

    stat = GdipCreateBitmapFromScan0(width, height, 0, PixelFormat32bppARGB, NULL, bitmap);
    if (stat != Ok) {
        DeleteObject(iinfo.hbmColor);
        DeleteObject(iinfo.hbmMask);
        HeapFree(GetProcessHeap(), 0, bits);
        return stat;
    }

    rect.X = 0;
    rect.Y = 0;
    rect.Width = width;
    rect.Height = height;

    stat = GdipBitmapLockBits(*bitmap, &rect, ImageLockModeWrite, PixelFormat32bppARGB, &lockeddata);
    if (stat != Ok) {
        DeleteObject(iinfo.hbmColor);
        DeleteObject(iinfo.hbmMask);
        HeapFree(GetProcessHeap(), 0, bits);
        GdipDisposeImage((GpImage*)*bitmap);
        return stat;
    }

    bih.biSize = sizeof(bih);
    bih.biWidth = width;
    bih.biHeight = -height;
    bih.biPlanes = 1;
    bih.biBitCount = 32;
    bih.biCompression = BI_RGB;
    bih.biSizeImage = 0;
    bih.biXPelsPerMeter = 0;
    bih.biYPelsPerMeter = 0;
    bih.biClrUsed = 0;
    bih.biClrImportant = 0;

    screendc = GetDC(0);
    if (iinfo.hbmColor)
    {
        GetDIBits(screendc, iinfo.hbmColor, 0, height, bits, (BITMAPINFO*)&bih, DIB_RGB_COLORS);

        if (bm.bmBitsPixel == 32)
        {
            has_alpha = FALSE;

            /* If any pixel has a non-zero alpha, ignore hbmMask */
            src = (DWORD*)bits;
            for (x=0; x<width && !has_alpha; x++)
                for (y=0; y<height && !has_alpha; y++)
                    if ((*src++ & 0xff000000) != 0)
                        has_alpha = TRUE;
        }
        else has_alpha = FALSE;
    }
    else
    {
        GetDIBits(screendc, iinfo.hbmMask, 0, height, bits, (BITMAPINFO*)&bih, DIB_RGB_COLORS);
        has_alpha = FALSE;
    }

    /* copy the image data to the Bitmap */
    src = (DWORD*)bits;
    dst_row = lockeddata.Scan0;
    for (y=0; y<height; y++)
    {
        memcpy(dst_row, src, width*4);
        src += width;
        dst_row += lockeddata.Stride;
    }

    if (!has_alpha)
    {
        if (iinfo.hbmMask)
        {
            /* read alpha data from the mask */
            if (iinfo.hbmColor)
                GetDIBits(screendc, iinfo.hbmMask, 0, height, bits, (BITMAPINFO*)&bih, DIB_RGB_COLORS);
            else
                GetDIBits(screendc, iinfo.hbmMask, height, height, bits, (BITMAPINFO*)&bih, DIB_RGB_COLORS);

            src = (DWORD*)bits;
            dst_row = lockeddata.Scan0;
            for (y=0; y<height; y++)
            {
                dst = (DWORD*)dst_row;
                for (x=0; x<height; x++)
                {
                    DWORD src_value = *src++;
                    if (src_value)
                        *dst++ = 0;
                    else
                        *dst++ |= 0xff000000;
                }
                dst_row += lockeddata.Stride;
            }
        }
        else
        {
            /* set constant alpha of 255 */
            dst_row = bits;
            for (y=0; y<height; y++)
            {
                dst = (DWORD*)dst_row;
                for (x=0; x<height; x++)
                    *dst++ |= 0xff000000;
                dst_row += lockeddata.Stride;
            }
        }
    }

    ReleaseDC(0, screendc);

    DeleteObject(iinfo.hbmColor);
    DeleteObject(iinfo.hbmMask);

    GdipBitmapUnlockBits(*bitmap, &lockeddata);

    HeapFree(GetProcessHeap(), 0, bits);

    return Ok;
}

static void generate_halftone_palette(ARGB *entries, UINT count)
{
    static const BYTE halftone_values[6]={0x00,0x33,0x66,0x99,0xcc,0xff};
    UINT i;

    for (i=0; i<8 && i<count; i++)
    {
        entries[i] = 0xff000000;
        if (i&1) entries[i] |= 0x800000;
        if (i&2) entries[i] |= 0x8000;
        if (i&4) entries[i] |= 0x80;
    }

    if (8 < count)
        entries[i] = 0xffc0c0c0;

    for (i=9; i<16 && i<count; i++)
    {
        entries[i] = 0xff000000;
        if (i&1) entries[i] |= 0xff0000;
        if (i&2) entries[i] |= 0xff00;
        if (i&4) entries[i] |= 0xff;
    }

    for (i=16; i<40 && i<count; i++)
    {
        entries[i] = 0;
    }

    for (i=40; i<256 && i<count; i++)
    {
        entries[i] = 0xff000000;
        entries[i] |= halftone_values[(i-40)%6];
        entries[i] |= halftone_values[((i-40)/6)%6] << 8;
        entries[i] |= halftone_values[((i-40)/36)%6] << 16;
    }
}

static GpStatus get_screen_resolution(REAL *xres, REAL *yres)
{
    HDC screendc = GetDC(0);

    if (!screendc) return GenericError;

    *xres = (REAL)GetDeviceCaps(screendc, LOGPIXELSX);
    *yres = (REAL)GetDeviceCaps(screendc, LOGPIXELSY);

    ReleaseDC(0, screendc);

    return Ok;
}

GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
    PixelFormat format, BYTE* scan0, GpBitmap** bitmap)
{
    BITMAPINFOHEADER bmih;
    HBITMAP hbitmap;
    INT row_size, dib_stride;
    HDC hdc;
    BYTE *bits;
    int i;
    REAL xres, yres;
    GpStatus stat;

    TRACE("%d %d %d %d %p %p\n", width, height, stride, format, scan0, bitmap);

    if (!bitmap) return InvalidParameter;

    if(width <= 0 || height <= 0 || (scan0 && (stride % 4))){
        *bitmap = NULL;
        return InvalidParameter;
    }

    if(scan0 && !stride)
        return InvalidParameter;

    stat = get_screen_resolution(&xres, &yres);
    if (stat != Ok) return stat;

    row_size = (width * PIXELFORMATBPP(format)+7) / 8;
    dib_stride = (row_size + 3) & ~3;

    if(stride == 0)
        stride = dib_stride;

    bmih.biSize = sizeof(BITMAPINFOHEADER);
    bmih.biWidth = width;
    bmih.biHeight = -height;
    bmih.biPlanes = 1;
    /* FIXME: use the rest of the data from format */
    bmih.biBitCount = PIXELFORMATBPP(format);
    bmih.biCompression = BI_RGB;
    bmih.biSizeImage = 0;
    bmih.biXPelsPerMeter = 0;
    bmih.biYPelsPerMeter = 0;
    bmih.biClrUsed = 0;
    bmih.biClrImportant = 0;

    hdc = CreateCompatibleDC(NULL);
    if (!hdc) return GenericError;

    hbitmap = CreateDIBSection(hdc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS, (void**)&bits,
        NULL, 0);

    DeleteDC(hdc);

    if (!hbitmap) return GenericError;

    /* copy bits to the dib if necessary */
    /* FIXME: should reference the bits instead of copying them */
    if (scan0)
        for (i=0; i<height; i++)
            memcpy(bits+i*dib_stride, scan0+i*stride, row_size);

    *bitmap = GdipAlloc(sizeof(GpBitmap));
    if(!*bitmap)
    {
        DeleteObject(hbitmap);
        return OutOfMemory;
    }

    (*bitmap)->image.type = ImageTypeBitmap;
    memcpy(&(*bitmap)->image.format, &ImageFormatMemoryBMP, sizeof(GUID));
    (*bitmap)->image.flags = ImageFlagsNone;
    (*bitmap)->image.palette_flags = 0;
    (*bitmap)->image.palette_count = 0;
    (*bitmap)->image.palette_size = 0;
    (*bitmap)->image.palette_entries = NULL;
    (*bitmap)->image.xres = xres;
    (*bitmap)->image.yres = yres;
    (*bitmap)->width = width;
    (*bitmap)->height = height;
    (*bitmap)->format = format;
    (*bitmap)->image.picture = NULL;
    (*bitmap)->hbitmap = hbitmap;
    (*bitmap)->hdc = NULL;
    (*bitmap)->bits = bits;
    (*bitmap)->stride = dib_stride;

    if (format == PixelFormat1bppIndexed ||
        format == PixelFormat4bppIndexed ||
        format == PixelFormat8bppIndexed)
    {
        (*bitmap)->image.palette_size = (*bitmap)->image.palette_count = 1 << PIXELFORMATBPP(format);
        (*bitmap)->image.palette_entries = GdipAlloc(sizeof(ARGB) * ((*bitmap)->image.palette_size));

        if (!(*bitmap)->image.palette_entries)
        {
            GdipDisposeImage(&(*bitmap)->image);
            *bitmap = NULL;
            return OutOfMemory;
        }

        if (format == PixelFormat1bppIndexed)
        {
            (*bitmap)->image.palette_flags = PaletteFlagsGrayScale;
            (*bitmap)->image.palette_entries[0] = 0xff000000;
            (*bitmap)->image.palette_entries[1] = 0xffffffff;
        }
        else
        {
            if (format == PixelFormat8bppIndexed)
                (*bitmap)->image.palette_flags = PaletteFlagsHalftone;

            generate_halftone_palette((*bitmap)->image.palette_entries,
                (*bitmap)->image.palette_count);
        }
    }

    TRACE("<-- %p\n", *bitmap);

    return Ok;
}

GpStatus WINGDIPAPI GdipCreateBitmapFromStream(IStream* stream,
    GpBitmap **bitmap)
{
    GpStatus stat;

    TRACE("%p %p\n", stream, bitmap);

    stat = GdipLoadImageFromStream(stream, (GpImage**) bitmap);

    if(stat != Ok)
        return stat;

    if((*bitmap)->image.type != ImageTypeBitmap){
        GdipDisposeImage(&(*bitmap)->image);
        *bitmap = NULL;
        return GenericError; /* FIXME: what error to return? */
    }

    return Ok;
}

/* FIXME: no icm */
GpStatus WINGDIPAPI GdipCreateBitmapFromStreamICM(IStream* stream,
    GpBitmap **bitmap)
{
    TRACE("%p %p\n", stream, bitmap);

    return GdipCreateBitmapFromStream(stream, bitmap);
}

GpStatus WINGDIPAPI GdipCreateCachedBitmap(GpBitmap *bitmap, GpGraphics *graphics,
    GpCachedBitmap **cachedbmp)
{
    GpStatus stat;

    TRACE("%p %p %p\n", bitmap, graphics, cachedbmp);

    if(!bitmap || !graphics || !cachedbmp)
        return InvalidParameter;

    *cachedbmp = GdipAlloc(sizeof(GpCachedBitmap));
    if(!*cachedbmp)
        return OutOfMemory;

    stat = GdipCloneImage(&(bitmap->image), &(*cachedbmp)->image);
    if(stat != Ok){
        GdipFree(*cachedbmp);
        return stat;
    }

    return Ok;
}

GpStatus WINGDIPAPI GdipCreateHICONFromBitmap(GpBitmap *bitmap, HICON *hicon)
{
    FIXME("(%p, %p)\n", bitmap, hicon);

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipDeleteCachedBitmap(GpCachedBitmap *cachedbmp)
{
    TRACE("%p\n", cachedbmp);

    if(!cachedbmp)
        return InvalidParameter;

    GdipDisposeImage(cachedbmp->image);
    GdipFree(cachedbmp);

    return Ok;
}

GpStatus WINGDIPAPI GdipDrawCachedBitmap(GpGraphics *graphics,
    GpCachedBitmap *cachedbmp, INT x, INT y)
{
    TRACE("%p %p %d %d\n", graphics, cachedbmp, x, y);

    if(!graphics || !cachedbmp)
        return InvalidParameter;

    return GdipDrawImage(graphics, cachedbmp->image, (REAL)x, (REAL)y);
}

GpStatus WINGDIPAPI GdipEmfToWmfBits(HENHMETAFILE hemf, UINT cbData16,
    LPBYTE pData16, INT iMapMode, INT eFlags)
{
    FIXME("(%p, %d, %p, %d, %d): stub\n", hemf, cbData16, pData16, iMapMode, eFlags);
    return NotImplemented;
}

GpStatus WINGDIPAPI GdipDisposeImage(GpImage *image)
{
    TRACE("%p\n", image);

    if(!image)
        return InvalidParameter;

    if (image->picture)
        IPicture_Release(image->picture);
    if (image->type == ImageTypeBitmap)
    {
        GdipFree(((GpBitmap*)image)->bitmapbits);
        DeleteDC(((GpBitmap*)image)->hdc);
    }
    GdipFree(image->palette_entries);
    GdipFree(image);

    return Ok;
}

GpStatus WINGDIPAPI GdipFindFirstImageItem(GpImage *image, ImageItemData* item)
{
    static int calls;

    TRACE("(%p,%p)\n", image, item);

    if(!image || !item)
        return InvalidParameter;

    if (!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipGetImageBounds(GpImage *image, GpRectF *srcRect,
    GpUnit *srcUnit)
{
    TRACE("%p %p %p\n", image, srcRect, srcUnit);

    if(!image || !srcRect || !srcUnit)
        return InvalidParameter;
    if(image->type == ImageTypeMetafile){
        *srcRect = ((GpMetafile*)image)->bounds;
        *srcUnit = ((GpMetafile*)image)->unit;
    }
    else if(image->type == ImageTypeBitmap){
        srcRect->X = srcRect->Y = 0.0;
        srcRect->Width = (REAL) ((GpBitmap*)image)->width;
        srcRect->Height = (REAL) ((GpBitmap*)image)->height;
        *srcUnit = UnitPixel;
    }
    else{
        srcRect->X = srcRect->Y = 0.0;
        srcRect->Width = ipicture_pixel_width(image->picture);
        srcRect->Height = ipicture_pixel_height(image->picture);
        *srcUnit = UnitPixel;
    }

    TRACE("returning (%f, %f) (%f, %f) unit type %d\n", srcRect->X, srcRect->Y,
          srcRect->Width, srcRect->Height, *srcUnit);

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageDimension(GpImage *image, REAL *width,
    REAL *height)
{
    TRACE("%p %p %p\n", image, width, height);

    if(!image || !height || !width)
        return InvalidParameter;

    if(image->type == ImageTypeMetafile){
        HDC hdc = GetDC(0);

        *height = convert_unit(hdc, ((GpMetafile*)image)->unit) *
                        ((GpMetafile*)image)->bounds.Height;

        *width = convert_unit(hdc, ((GpMetafile*)image)->unit) *
                        ((GpMetafile*)image)->bounds.Width;

        ReleaseDC(0, hdc);
    }

    else if(image->type == ImageTypeBitmap){
        *height = ((GpBitmap*)image)->height;
        *width = ((GpBitmap*)image)->width;
    }
    else{
        *height = ipicture_pixel_height(image->picture);
        *width = ipicture_pixel_width(image->picture);
    }

    TRACE("returning (%f, %f)\n", *height, *width);
    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageGraphicsContext(GpImage *image,
    GpGraphics **graphics)
{
    HDC hdc;

    TRACE("%p %p\n", image, graphics);

    if(!image || !graphics)
        return InvalidParameter;

    if(image->type != ImageTypeBitmap){
        FIXME("not implemented for image type %d\n", image->type);
        return NotImplemented;
    }

    hdc = ((GpBitmap*)image)->hdc;

    if(!hdc){
        hdc = CreateCompatibleDC(0);
        SelectObject(hdc, ((GpBitmap*)image)->hbitmap);
        ((GpBitmap*)image)->hdc = hdc;
    }

    return GdipCreateFromHDC(hdc, graphics);
}

GpStatus WINGDIPAPI GdipGetImageHeight(GpImage *image, UINT *height)
{
    TRACE("%p %p\n", image, height);

    if(!image || !height)
        return InvalidParameter;

    if(image->type == ImageTypeMetafile){
        HDC hdc = GetDC(0);

        *height = roundr(convert_unit(hdc, ((GpMetafile*)image)->unit) *
                        ((GpMetafile*)image)->bounds.Height);

        ReleaseDC(0, hdc);
    }
    else if(image->type == ImageTypeBitmap)
        *height = ((GpBitmap*)image)->height;
    else
        *height = ipicture_pixel_height(image->picture);

    TRACE("returning %d\n", *height);

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageHorizontalResolution(GpImage *image, REAL *res)
{
    if(!image || !res)
        return InvalidParameter;

    *res = image->xres;

    TRACE("(%p) <-- %0.2f\n", image, *res);

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImagePaletteSize(GpImage *image, INT *size)
{
    TRACE("%p %p\n", image, size);

    if(!image || !size)
        return InvalidParameter;

    if (image->palette_count == 0)
        *size = sizeof(ColorPalette);
    else
        *size = sizeof(UINT)*2 + sizeof(ARGB)*image->palette_count;

    TRACE("<-- %u\n", *size);

    return Ok;
}

/* FIXME: test this function for non-bitmap types */
GpStatus WINGDIPAPI GdipGetImagePixelFormat(GpImage *image, PixelFormat *format)
{
    TRACE("%p %p\n", image, format);

    if(!image || !format)
        return InvalidParameter;

    if(image->type != ImageTypeBitmap)
        *format = PixelFormat24bppRGB;
    else
        *format = ((GpBitmap*) image)->format;

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageRawFormat(GpImage *image, GUID *format)
{
    if(!image || !format)
        return InvalidParameter;

    memcpy(format, &image->format, sizeof(GUID));

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageType(GpImage *image, ImageType *type)
{
    TRACE("%p %p\n", image, type);

    if(!image || !type)
        return InvalidParameter;

    *type = image->type;

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageVerticalResolution(GpImage *image, REAL *res)
{
    if(!image || !res)
        return InvalidParameter;

    *res = image->yres;

    TRACE("(%p) <-- %0.2f\n", image, *res);

    return Ok;
}

GpStatus WINGDIPAPI GdipGetImageWidth(GpImage *image, UINT *width)
{
    TRACE("%p %p\n", image, width);

    if(!image || !width)
        return InvalidParameter;

    if(image->type == ImageTypeMetafile){
        HDC hdc = GetDC(0);

        *width = roundr(convert_unit(hdc, ((GpMetafile*)image)->unit) *
                        ((GpMetafile*)image)->bounds.Width);

        ReleaseDC(0, hdc);
    }
    else if(image->type == ImageTypeBitmap)
        *width = ((GpBitmap*)image)->width;
    else
        *width = ipicture_pixel_width(image->picture);

    TRACE("returning %d\n", *width);

    return Ok;
}

GpStatus WINGDIPAPI GdipGetMetafileHeaderFromMetafile(GpMetafile * metafile,
    MetafileHeader * header)
{
    static int calls;

    if(!metafile || !header)
        return InvalidParameter;

    if(!(calls++))
        FIXME("not implemented\n");

    return Ok;
}

GpStatus WINGDIPAPI GdipGetAllPropertyItems(GpImage *image, UINT size,
    UINT num, PropertyItem* items)
{
    static int calls;

    if(!(calls++))
        FIXME("not implemented\n");

    return InvalidParameter;
}

GpStatus WINGDIPAPI GdipGetPropertyCount(GpImage *image, UINT* num)
{
    static int calls;

    if(!(calls++))
        FIXME("not implemented\n");

    return InvalidParameter;
}

GpStatus WINGDIPAPI GdipGetPropertyIdList(GpImage *image, UINT num, PROPID* list)
{
    static int calls;

    if(!(calls++))
        FIXME("not implemented\n");

    return InvalidParameter;
}

GpStatus WINGDIPAPI GdipGetPropertyItem(GpImage *image, PROPID id, UINT size,
    PropertyItem* buffer)
{
    static int calls;

    if(!(calls++))
        FIXME("not implemented\n");

    return InvalidParameter;
}

GpStatus WINGDIPAPI GdipGetPropertyItemSize(GpImage *image, PROPID pid,
    UINT* size)
{
    static int calls;

    TRACE("%p %x %p\n", image, pid, size);

    if(!size || !image)
        return InvalidParameter;

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipGetPropertySize(GpImage *image, UINT* size, UINT* num)
{
    static int calls;

    TRACE("(%p,%p,%p)\n", image, size, num);

    if(!(calls++))
        FIXME("not implemented\n");

    return InvalidParameter;
}

struct image_format_dimension
{
    const GUID *format;
    const GUID *dimension;
};

struct image_format_dimension image_format_dimensions[] =
{
    {&ImageFormatGIF, &FrameDimensionTime},
    {&ImageFormatIcon, &FrameDimensionResolution},
    {NULL}
};

GpStatus WINGDIPAPI GdipImageGetFrameCount(GpImage *image,
    GDIPCONST GUID* dimensionID, UINT* count)
{
    static int calls;

    TRACE("(%p,%s,%p)\n", image, debugstr_guid(dimensionID), count);

    if(!image || !dimensionID || !count)
        return InvalidParameter;

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipImageGetFrameDimensionsCount(GpImage *image,
    UINT* count)
{
    /* Native gdiplus 1.1 does not yet support multiple frame dimensions. */

    if(!image || !count)
        return InvalidParameter;

    *count = 1;

    return Ok;
}

GpStatus WINGDIPAPI GdipImageGetFrameDimensionsList(GpImage* image,
    GUID* dimensionIDs, UINT count)
{
    int i;
    const GUID *result=NULL;

    TRACE("(%p,%p,%u)\n", image, dimensionIDs, count);

    if(!image || !dimensionIDs || count != 1)
        return InvalidParameter;

    for (i=0; image_format_dimensions[i].format; i++)
    {
        if (IsEqualGUID(&image->format, image_format_dimensions[i].format))
        {
            result = image_format_dimensions[i].dimension;
            break;
        }
    }

    if (!result)
        result = &FrameDimensionPage;

    memcpy(dimensionIDs, result, sizeof(GUID));

    return Ok;
}

GpStatus WINGDIPAPI GdipImageSelectActiveFrame(GpImage *image,
    GDIPCONST GUID* dimensionID, UINT frameidx)
{
    static int calls;

    if(!image || !dimensionID)
        return InvalidParameter;

    if(!(calls++))
        FIXME("not implemented\n");

    return Ok;
}

GpStatus WINGDIPAPI GdipLoadImageFromFile(GDIPCONST WCHAR* filename,
                                          GpImage **image)
{
    GpStatus stat;
    IStream *stream;

    TRACE("(%s) %p\n", debugstr_w(filename), image);

    if (!filename || !image)
        return InvalidParameter;

    stat = GdipCreateStreamOnFile(filename, GENERIC_READ, &stream);

    if (stat != Ok)
        return stat;

    stat = GdipLoadImageFromStream(stream, image);

    IStream_Release(stream);

    return stat;
}

/* FIXME: no icm handling */
GpStatus WINGDIPAPI GdipLoadImageFromFileICM(GDIPCONST WCHAR* filename,GpImage **image)
{
    TRACE("(%s) %p\n", debugstr_w(filename), image);

    return GdipLoadImageFromFile(filename, image);
}

static const WICPixelFormatGUID *wic_pixel_formats[] = {
    &GUID_WICPixelFormat16bppBGR555,
    &GUID_WICPixelFormat24bppBGR,
    &GUID_WICPixelFormat32bppBGR,
    &GUID_WICPixelFormat32bppBGRA,
    &GUID_WICPixelFormat32bppPBGRA,
    NULL
};

static const PixelFormat wic_gdip_formats[] = {
    PixelFormat16bppRGB555,
    PixelFormat24bppRGB,
    PixelFormat32bppRGB,
    PixelFormat32bppARGB,
    PixelFormat32bppPARGB,
};

static GpStatus decode_image_wic(IStream* stream, REFCLSID clsid, GpImage **image)
{
    GpStatus status=Ok;
    GpBitmap *bitmap;
    HRESULT hr;
    IWICBitmapDecoder *decoder;
    IWICBitmapFrameDecode *frame;
    IWICBitmapSource *source=NULL;
    WICPixelFormatGUID wic_format;
    PixelFormat gdip_format=0;
    int i;
    UINT width, height;
    BitmapData lockeddata;
    WICRect wrc;
    HRESULT initresult;

    initresult = CoInitialize(NULL);

    hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER,
        &IID_IWICBitmapDecoder, (void**)&decoder);
    if (FAILED(hr)) goto end;

    hr = IWICBitmapDecoder_Initialize(decoder, (IStream*)stream, WICDecodeMetadataCacheOnLoad);
    if (SUCCEEDED(hr))
        hr = IWICBitmapDecoder_GetFrame(decoder, 0, &frame);

    if (SUCCEEDED(hr)) /* got frame */
    {
        hr = IWICBitmapFrameDecode_GetPixelFormat(frame, &wic_format);

        if (SUCCEEDED(hr))
        {
            for (i=0; wic_pixel_formats[i]; i++)
            {
                if (IsEqualGUID(&wic_format, wic_pixel_formats[i]))
                {
                    source = (IWICBitmapSource*)frame;
                    IWICBitmapSource_AddRef(source);
                    gdip_format = wic_gdip_formats[i];
                    break;
                }
            }
            if (!source)
            {
                /* unknown format; fall back on 32bppARGB */
                hr = WICConvertBitmapSource(&GUID_WICPixelFormat32bppBGRA, (IWICBitmapSource*)frame, &source);
                gdip_format = PixelFormat32bppARGB;
            }
        }

        if (SUCCEEDED(hr)) /* got source */
        {
            hr = IWICBitmapSource_GetSize(source, &width, &height);

            if (SUCCEEDED(hr))
                status = GdipCreateBitmapFromScan0(width, height, 0, gdip_format,
                    NULL, &bitmap);

            if (SUCCEEDED(hr) && status == Ok) /* created bitmap */
            {
                status = GdipBitmapLockBits(bitmap, NULL, ImageLockModeWrite,
                    gdip_format, &lockeddata);
                if (status == Ok) /* locked bitmap */
                {
                    wrc.X = 0;
                    wrc.Width = width;
                    wrc.Height = 1;
                    for (i=0; i<height; i++)
                    {
                        wrc.Y = i;
                        hr = IWICBitmapSource_CopyPixels(source, &wrc, abs(lockeddata.Stride),
                            abs(lockeddata.Stride), (BYTE*)lockeddata.Scan0+lockeddata.Stride*i);
                        if (FAILED(hr)) break;
                    }

                    GdipBitmapUnlockBits(bitmap, &lockeddata);
                }

                if (SUCCEEDED(hr) && status == Ok)
                    *image = (GpImage*)bitmap;
                else
                {
                    *image = NULL;
                    GdipDisposeImage((GpImage*)bitmap);
                }
            }

            IWICBitmapSource_Release(source);
        }

        IWICBitmapFrameDecode_Release(frame);
    }

    IWICBitmapDecoder_Release(decoder);

end:
    if (SUCCEEDED(initresult)) CoUninitialize();

    if (FAILED(hr) && status == Ok) status = hresult_to_status(hr);

    return status;
}

static GpStatus decode_image_icon(IStream* stream, REFCLSID clsid, GpImage **image)
{
    return decode_image_wic(stream, &CLSID_WICIcoDecoder, image);
}

static GpStatus decode_image_bmp(IStream* stream, REFCLSID clsid, GpImage **image)
{
    GpStatus status;
    GpBitmap* bitmap;

    status = decode_image_wic(stream, &CLSID_WICBmpDecoder, image);

    bitmap = (GpBitmap*)*image;

    if (status == Ok && bitmap->format == PixelFormat32bppARGB)
    {
        /* WIC supports bmp files with alpha, but gdiplus does not */
        bitmap->format = PixelFormat32bppRGB;
    }

    return status;
}

static GpStatus decode_image_jpeg(IStream* stream, REFCLSID clsid, GpImage **image)
{
    return decode_image_wic(stream, &CLSID_WICJpegDecoder, image);
}

static GpStatus decode_image_png(IStream* stream, REFCLSID clsid, GpImage **image)
{
    return decode_image_wic(stream, &CLSID_WICPngDecoder, image);
}

static GpStatus decode_image_gif(IStream* stream, REFCLSID clsid, GpImage **image)
{
    return decode_image_wic(stream, &CLSID_WICGifDecoder, image);
}

static GpStatus decode_image_olepicture_metafile(IStream* stream, REFCLSID clsid, GpImage **image)
{
    IPicture *pic;

    TRACE("%p %p\n", stream, image);

    if(!stream || !image)
        return InvalidParameter;

    if(OleLoadPicture(stream, 0, FALSE, &IID_IPicture,
        (LPVOID*) &pic) != S_OK){
        TRACE("Could not load picture\n");
        return GenericError;
    }

    /* FIXME: missing initialization code */
    *image = GdipAlloc(sizeof(GpMetafile));
    if(!*image) return OutOfMemory;
    (*image)->type = ImageTypeMetafile;
    (*image)->picture = pic;
    (*image)->flags   = ImageFlagsNone;
    (*image)->palette_flags = 0;
    (*image)->palette_count = 0;
    (*image)->palette_size = 0;
    (*image)->palette_entries = NULL;

    TRACE("<-- %p\n", *image);

    return Ok;
}

typedef GpStatus (*encode_image_func)(GpImage *image, IStream* stream,
    GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params);

typedef GpStatus (*decode_image_func)(IStream *stream, REFCLSID clsid, GpImage** image);

typedef struct image_codec {
    ImageCodecInfo info;
    encode_image_func encode_func;
    decode_image_func decode_func;
} image_codec;

typedef enum {
    BMP,
    JPEG,
    GIF,
    EMF,
    WMF,
    PNG,
    ICO,
    NUM_CODECS
} ImageFormat;

static const struct image_codec codecs[NUM_CODECS];

static GpStatus get_decoder_info(IStream* stream, const struct image_codec **result)
{
    BYTE signature[8];
    LARGE_INTEGER seek;
    HRESULT hr;
    UINT bytesread;
    int i, j;

    /* seek to the start of the stream */
    seek.QuadPart = 0;
    hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
    if (FAILED(hr)) return hresult_to_status(hr);

    /* read the first 8 bytes */
    /* FIXME: This assumes all codecs have one signature <= 8 bytes in length */
    hr = IStream_Read(stream, signature, 8, &bytesread);
    if (FAILED(hr)) return hresult_to_status(hr);
    if (hr == S_FALSE || bytesread == 0) return GenericError;

    for (i = 0; i < NUM_CODECS; i++) {
        if ((codecs[i].info.Flags & ImageCodecFlagsDecoder) &&
            bytesread >= codecs[i].info.SigSize)
        {
            for (j=0; j<codecs[i].info.SigSize; j++)
                if ((signature[j] & codecs[i].info.SigMask[j]) != codecs[i].info.SigPattern[j])
                    break;
            if (j == codecs[i].info.SigSize)
            {
                *result = &codecs[i];
                return Ok;
            }
        }
    }

    TRACE("no match for %i byte signature %x %x %x %x %x %x %x %x\n", bytesread,
        signature[0],signature[1],signature[2],signature[3],
        signature[4],signature[5],signature[6],signature[7]);

    return GenericError;
}

GpStatus WINGDIPAPI GdipLoadImageFromStream(IStream* stream, GpImage **image)
{
    GpStatus stat;
    LARGE_INTEGER seek;
    HRESULT hr;
    const struct image_codec *codec=NULL;

    /* choose an appropriate image decoder */
    stat = get_decoder_info(stream, &codec);
    if (stat != Ok) return stat;

    /* seek to the start of the stream */
    seek.QuadPart = 0;
    hr = IStream_Seek(stream, seek, STREAM_SEEK_SET, NULL);
    if (FAILED(hr)) return hresult_to_status(hr);

    /* call on the image decoder to do the real work */
    stat = codec->decode_func(stream, &codec->info.Clsid, image);

    /* take note of the original data format */
    if (stat == Ok)
    {
        memcpy(&(*image)->format, &codec->info.FormatID, sizeof(GUID));
    }

    return stat;
}

/* FIXME: no ICM */
GpStatus WINGDIPAPI GdipLoadImageFromStreamICM(IStream* stream, GpImage **image)
{
    TRACE("%p %p\n", stream, image);

    return GdipLoadImageFromStream(stream, image);
}

GpStatus WINGDIPAPI GdipRemovePropertyItem(GpImage *image, PROPID propId)
{
    static int calls;

    TRACE("(%p,%u)\n", image, propId);

    if(!image)
        return InvalidParameter;

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipSetPropertyItem(GpImage *image, GDIPCONST PropertyItem* item)
{
    static int calls;

    TRACE("(%p,%p)\n", image, item);

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipSaveImageToFile(GpImage *image, GDIPCONST WCHAR* filename,
                                        GDIPCONST CLSID *clsidEncoder,
                                        GDIPCONST EncoderParameters *encoderParams)
{
    GpStatus stat;
    IStream *stream;

    TRACE("%p (%s) %p %p\n", image, debugstr_w(filename), clsidEncoder, encoderParams);

    if (!image || !filename|| !clsidEncoder)
        return InvalidParameter;

    stat = GdipCreateStreamOnFile(filename, GENERIC_WRITE, &stream);
    if (stat != Ok)
        return GenericError;

    stat = GdipSaveImageToStream(image, stream, clsidEncoder, encoderParams);

    IStream_Release(stream);
    return stat;
}

/*************************************************************************
 * Encoding functions -
 *   These functions encode an image in different image file formats.
 */
#define BITMAP_FORMAT_BMP   0x4d42 /* "BM" */
#define BITMAP_FORMAT_JPEG  0xd8ff
#define BITMAP_FORMAT_GIF   0x4947
#define BITMAP_FORMAT_PNG   0x5089
#define BITMAP_FORMAT_APM   0xcdd7

static GpStatus encode_image_WIC(GpImage *image, IStream* stream,
    GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params)
{
    GpStatus stat;
    GpBitmap *bitmap;
    IWICBitmapEncoder *encoder;
    IWICBitmapFrameEncode *frameencode;
    IPropertyBag2 *encoderoptions;
    HRESULT hr;
    UINT width, height;
    PixelFormat gdipformat=0;
    WICPixelFormatGUID wicformat;
    GpRect rc;
    BitmapData lockeddata;
    HRESULT initresult;
    UINT i;

    if (image->type != ImageTypeBitmap)
        return GenericError;

    bitmap = (GpBitmap*)image;

    GdipGetImageWidth(image, &width);
    GdipGetImageHeight(image, &height);

    rc.X = 0;
    rc.Y = 0;
    rc.Width = width;
    rc.Height = height;

    initresult = CoInitialize(NULL);

    hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER,
        &IID_IWICBitmapEncoder, (void**)&encoder);
    if (FAILED(hr))
    {
        if (SUCCEEDED(initresult)) CoUninitialize();
        return hresult_to_status(hr);
    }

    hr = IWICBitmapEncoder_Initialize(encoder, stream, WICBitmapEncoderNoCache);

    if (SUCCEEDED(hr))
    {
        hr = IWICBitmapEncoder_CreateNewFrame(encoder, &frameencode, &encoderoptions);
    }

    if (SUCCEEDED(hr)) /* created frame */
    {
        hr = IWICBitmapFrameEncode_Initialize(frameencode, encoderoptions);

        if (SUCCEEDED(hr))
            hr = IWICBitmapFrameEncode_SetSize(frameencode, width, height);

        if (SUCCEEDED(hr))
            /* FIXME: use the resolution from the image */
            hr = IWICBitmapFrameEncode_SetResolution(frameencode, 96.0, 96.0);

        if (SUCCEEDED(hr))
        {
            for (i=0; wic_pixel_formats[i]; i++)
            {
                if (wic_gdip_formats[i] == bitmap->format)
                    break;
            }
            if (wic_pixel_formats[i])
                memcpy(&wicformat, wic_pixel_formats[i], sizeof(GUID));
            else
                memcpy(&wicformat, &GUID_WICPixelFormat32bppBGRA, sizeof(GUID));

            hr = IWICBitmapFrameEncode_SetPixelFormat(frameencode, &wicformat);

            for (i=0; wic_pixel_formats[i]; i++)
            {
                if (IsEqualGUID(&wicformat, wic_pixel_formats[i]))
                    break;
            }
            if (wic_pixel_formats[i])
                gdipformat = wic_gdip_formats[i];
            else
            {
                ERR("cannot provide pixel format %s\n", debugstr_guid(&wicformat));
                hr = E_FAIL;
            }
        }

        if (SUCCEEDED(hr))
        {
            stat = GdipBitmapLockBits(bitmap, &rc, ImageLockModeRead, gdipformat,
                &lockeddata);

            if (stat == Ok)
            {
                UINT row_size = (lockeddata.Width * PIXELFORMATBPP(gdipformat) + 7)/8;
                BYTE *row;

                /* write one row at a time in case stride is negative */
                row = lockeddata.Scan0;
                for (i=0; i<lockeddata.Height; i++)
                {
                    hr = IWICBitmapFrameEncode_WritePixels(frameencode, 1, row_size, row_size, row);
                    if (FAILED(hr)) break;
                    row += lockeddata.Stride;
                }

                GdipBitmapUnlockBits(bitmap, &lockeddata);
            }
            else
                hr = E_FAIL;
        }

        if (SUCCEEDED(hr))
            hr = IWICBitmapFrameEncode_Commit(frameencode);

        IWICBitmapFrameEncode_Release(frameencode);
        IPropertyBag2_Release(encoderoptions);
    }

    if (SUCCEEDED(hr))
        hr = IWICBitmapEncoder_Commit(encoder);

    IWICBitmapEncoder_Release(encoder);

    if (SUCCEEDED(initresult)) CoUninitialize();

    return hresult_to_status(hr);
}

static GpStatus encode_image_BMP(GpImage *image, IStream* stream,
    GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params)
{
    return encode_image_WIC(image, stream, &CLSID_WICBmpEncoder, params);
}

static GpStatus encode_image_png(GpImage *image, IStream* stream,
    GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params)
{
    return encode_image_WIC(image, stream, &CLSID_WICPngEncoder, params);
}

/*****************************************************************************
 * GdipSaveImageToStream [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipSaveImageToStream(GpImage *image, IStream* stream,
    GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params)
{
    GpStatus stat;
    encode_image_func encode_image;
    int i;

    TRACE("%p %p %p %p\n", image, stream, clsid, params);

    if(!image || !stream)
        return InvalidParameter;

    /* select correct encoder */
    encode_image = NULL;
    for (i = 0; i < NUM_CODECS; i++) {
        if ((codecs[i].info.Flags & ImageCodecFlagsEncoder) &&
            IsEqualCLSID(clsid, &codecs[i].info.Clsid))
            encode_image = codecs[i].encode_func;
    }
    if (encode_image == NULL)
        return UnknownImageFormat;

    stat = encode_image(image, stream, clsid, params);

    return stat;
}

/*****************************************************************************
 * GdipGetImagePalette [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImagePalette(GpImage *image, ColorPalette *palette, INT size)
{
    TRACE("(%p,%p,%i)\n", image, palette, size);

    if (!image || !palette)
        return InvalidParameter;

    if (size < (sizeof(UINT)*2+sizeof(ARGB)*image->palette_count))
    {
        TRACE("<-- InsufficientBuffer\n");
        return InsufficientBuffer;
    }

    palette->Flags = image->palette_flags;
    palette->Count = image->palette_count;
    memcpy(palette->Entries, image->palette_entries, sizeof(ARGB)*image->palette_count);

    return Ok;
}

/*****************************************************************************
 * GdipSetImagePalette [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipSetImagePalette(GpImage *image,
    GDIPCONST ColorPalette *palette)
{
    TRACE("(%p,%p)\n", image, palette);

    if(!image || !palette || palette->Count > 256)
        return InvalidParameter;

    if (palette->Count > image->palette_size)
    {
        ARGB *new_palette;

        new_palette = GdipAlloc(sizeof(ARGB) * palette->Count);
        if (!new_palette) return OutOfMemory;

        GdipFree(image->palette_entries);
        image->palette_entries = new_palette;
        image->palette_size = palette->Count;
    }

    image->palette_flags = palette->Flags;
    image->palette_count = palette->Count;
    memcpy(image->palette_entries, palette->Entries, sizeof(ARGB)*palette->Count);

    return Ok;
}

/*************************************************************************
 * Encoders -
 *   Structures that represent which formats we support for encoding.
 */

/* ImageCodecInfo creation routines taken from libgdiplus */
static const WCHAR bmp_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'B', 'M', 'P', 0}; /* Built-in BMP */
static const WCHAR bmp_extension[] = {'*','.','B', 'M', 'P',';', '*','.', 'D','I', 'B',';', '*','.', 'R', 'L', 'E',0}; /* *.BMP;*.DIB;*.RLE */
static const WCHAR bmp_mimetype[] = {'i', 'm', 'a','g', 'e', '/', 'b', 'm', 'p', 0}; /* image/bmp */
static const WCHAR bmp_format[] = {'B', 'M', 'P', 0}; /* BMP */
static const BYTE bmp_sig_pattern[] = { 0x42, 0x4D };
static const BYTE bmp_sig_mask[] = { 0xFF, 0xFF };

static const WCHAR jpeg_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'J','P','E','G', 0};
static const WCHAR jpeg_extension[] = {'*','.','J','P','G',';', '*','.','J','P','E','G',';', '*','.','J','P','E',';', '*','.','J','F','I','F',0};
static const WCHAR jpeg_mimetype[] = {'i','m','a','g','e','/','j','p','e','g', 0};
static const WCHAR jpeg_format[] = {'J','P','E','G',0};
static const BYTE jpeg_sig_pattern[] = { 0xFF, 0xD8 };
static const BYTE jpeg_sig_mask[] = { 0xFF, 0xFF };

static const WCHAR gif_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'G','I','F', 0};
static const WCHAR gif_extension[] = {'*','.','G','I','F',0};
static const WCHAR gif_mimetype[] = {'i','m','a','g','e','/','g','i','f', 0};
static const WCHAR gif_format[] = {'G','I','F',0};
static const BYTE gif_sig_pattern[4] = "GIF8";
static const BYTE gif_sig_mask[] = { 0xFF, 0xFF, 0xFF, 0xFF };

static const WCHAR emf_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'E','M','F', 0};
static const WCHAR emf_extension[] = {'*','.','E','M','F',0};
static const WCHAR emf_mimetype[] = {'i','m','a','g','e','/','x','-','e','m','f', 0};
static const WCHAR emf_format[] = {'E','M','F',0};
static const BYTE emf_sig_pattern[] = { 0x01, 0x00, 0x00, 0x00 };
static const BYTE emf_sig_mask[] = { 0xFF, 0xFF, 0xFF, 0xFF };

static const WCHAR wmf_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'W','M','F', 0};
static const WCHAR wmf_extension[] = {'*','.','W','M','F',0};
static const WCHAR wmf_mimetype[] = {'i','m','a','g','e','/','x','-','w','m','f', 0};
static const WCHAR wmf_format[] = {'W','M','F',0};
static const BYTE wmf_sig_pattern[] = { 0xd7, 0xcd };
static const BYTE wmf_sig_mask[] = { 0xFF, 0xFF };

static const WCHAR png_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'P','N','G', 0};
static const WCHAR png_extension[] = {'*','.','P','N','G',0};
static const WCHAR png_mimetype[] = {'i','m','a','g','e','/','p','n','g', 0};
static const WCHAR png_format[] = {'P','N','G',0};
static const BYTE png_sig_pattern[] = { 137, 80, 78, 71, 13, 10, 26, 10, };
static const BYTE png_sig_mask[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

static const WCHAR ico_codecname[] = {'B', 'u', 'i','l', 't', '-','i', 'n', ' ', 'I','C','O', 0};
static const WCHAR ico_extension[] = {'*','.','I','C','O',0};
static const WCHAR ico_mimetype[] = {'i','m','a','g','e','/','x','-','i','c','o','n', 0};
static const WCHAR ico_format[] = {'I','C','O',0};
static const BYTE ico_sig_pattern[] = { 0x00, 0x00, 0x01, 0x00 };
static const BYTE ico_sig_mask[] = { 0xFF, 0xFF, 0xFF, 0xFF };

static const struct image_codec codecs[NUM_CODECS] = {
    {
        { /* BMP */
            /* Clsid */              { 0x557cf400, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cabU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          bmp_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  bmp_format,
            /* FilenameExtension */  bmp_extension,
            /* MimeType */           bmp_mimetype,
            /* Flags */              ImageCodecFlagsEncoder | ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            2,
            /* SigPattern */         bmp_sig_pattern,
            /* SigMask */            bmp_sig_mask,
        },
        encode_image_BMP,
        decode_image_bmp
    },
    {
        { /* JPEG */
            /* Clsid */              { 0x557cf401, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3caeU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          jpeg_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  jpeg_format,
            /* FilenameExtension */  jpeg_extension,
            /* MimeType */           jpeg_mimetype,
            /* Flags */              ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            2,
            /* SigPattern */         jpeg_sig_pattern,
            /* SigMask */            jpeg_sig_mask,
        },
        NULL,
        decode_image_jpeg
    },
    {
        { /* GIF */
            /* Clsid */              { 0x557cf402, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cb0U, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          gif_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  gif_format,
            /* FilenameExtension */  gif_extension,
            /* MimeType */           gif_mimetype,
            /* Flags */              ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            4,
            /* SigPattern */         gif_sig_pattern,
            /* SigMask */            gif_sig_mask,
        },
        NULL,
        decode_image_gif
    },
    {
        { /* EMF */
            /* Clsid */              { 0x557cf403, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cacU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          emf_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  emf_format,
            /* FilenameExtension */  emf_extension,
            /* MimeType */           emf_mimetype,
            /* Flags */              ImageCodecFlagsDecoder | ImageCodecFlagsSupportVector | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            4,
            /* SigPattern */         emf_sig_pattern,
            /* SigMask */            emf_sig_mask,
        },
        NULL,
        decode_image_olepicture_metafile
    },
    {
        { /* WMF */
            /* Clsid */              { 0x557cf404, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cadU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          wmf_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  wmf_format,
            /* FilenameExtension */  wmf_extension,
            /* MimeType */           wmf_mimetype,
            /* Flags */              ImageCodecFlagsDecoder | ImageCodecFlagsSupportVector | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            2,
            /* SigPattern */         wmf_sig_pattern,
            /* SigMask */            wmf_sig_mask,
        },
        NULL,
        decode_image_olepicture_metafile
    },
    {
        { /* PNG */
            /* Clsid */              { 0x557cf406, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cafU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          png_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  png_format,
            /* FilenameExtension */  png_extension,
            /* MimeType */           png_mimetype,
            /* Flags */              ImageCodecFlagsEncoder | ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            8,
            /* SigPattern */         png_sig_pattern,
            /* SigMask */            png_sig_mask,
        },
        encode_image_png,
        decode_image_png
    },
    {
        { /* ICO */
            /* Clsid */              { 0x557cf407, 0x1a04, 0x11d3, { 0x9a, 0x73, 0x0, 0x0, 0xf8, 0x1e, 0xf3, 0x2e } },
            /* FormatID */           { 0xb96b3cabU, 0x0728U, 0x11d3U, {0x9d, 0x7b, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e} },
            /* CodecName */          ico_codecname,
            /* DllName */            NULL,
            /* FormatDescription */  ico_format,
            /* FilenameExtension */  ico_extension,
            /* MimeType */           ico_mimetype,
            /* Flags */              ImageCodecFlagsDecoder | ImageCodecFlagsSupportBitmap | ImageCodecFlagsBuiltin,
            /* Version */            1,
            /* SigCount */           1,
            /* SigSize */            4,
            /* SigPattern */         ico_sig_pattern,
            /* SigMask */            ico_sig_mask,
        },
        NULL,
        decode_image_icon
    },
};

/*****************************************************************************
 * GdipGetImageDecodersSize [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageDecodersSize(UINT *numDecoders, UINT *size)
{
    int decoder_count=0;
    int i;
    TRACE("%p %p\n", numDecoders, size);

    if (!numDecoders || !size)
        return InvalidParameter;

    for (i=0; i<NUM_CODECS; i++)
    {
        if (codecs[i].info.Flags & ImageCodecFlagsDecoder)
            decoder_count++;
    }

    *numDecoders = decoder_count;
    *size = decoder_count * sizeof(ImageCodecInfo);

    return Ok;
}

/*****************************************************************************
 * GdipGetImageDecoders [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageDecoders(UINT numDecoders, UINT size, ImageCodecInfo *decoders)
{
    int i, decoder_count=0;
    TRACE("%u %u %p\n", numDecoders, size, decoders);

    if (!decoders ||
        size != numDecoders * sizeof(ImageCodecInfo))
        return GenericError;

    for (i=0; i<NUM_CODECS; i++)
    {
        if (codecs[i].info.Flags & ImageCodecFlagsDecoder)
        {
            if (decoder_count == numDecoders) return GenericError;
            memcpy(&decoders[decoder_count], &codecs[i].info, sizeof(ImageCodecInfo));
            decoder_count++;
        }
    }

    if (decoder_count < numDecoders) return GenericError;

    return Ok;
}

/*****************************************************************************
 * GdipGetImageEncodersSize [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageEncodersSize(UINT *numEncoders, UINT *size)
{
    int encoder_count=0;
    int i;
    TRACE("%p %p\n", numEncoders, size);

    if (!numEncoders || !size)
        return InvalidParameter;

    for (i=0; i<NUM_CODECS; i++)
    {
        if (codecs[i].info.Flags & ImageCodecFlagsEncoder)
            encoder_count++;
    }

    *numEncoders = encoder_count;
    *size = encoder_count * sizeof(ImageCodecInfo);

    return Ok;
}

/*****************************************************************************
 * GdipGetImageEncoders [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageEncoders(UINT numEncoders, UINT size, ImageCodecInfo *encoders)
{
    int i, encoder_count=0;
    TRACE("%u %u %p\n", numEncoders, size, encoders);

    if (!encoders ||
        size != numEncoders * sizeof(ImageCodecInfo))
        return GenericError;

    for (i=0; i<NUM_CODECS; i++)
    {
        if (codecs[i].info.Flags & ImageCodecFlagsEncoder)
        {
            if (encoder_count == numEncoders) return GenericError;
            memcpy(&encoders[encoder_count], &codecs[i].info, sizeof(ImageCodecInfo));
            encoder_count++;
        }
    }

    if (encoder_count < numEncoders) return GenericError;

    return Ok;
}

/*****************************************************************************
 * GdipCreateBitmapFromHBITMAP [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipCreateBitmapFromHBITMAP(HBITMAP hbm, HPALETTE hpal, GpBitmap** bitmap)
{
    BITMAP bm;
    GpStatus retval;
    PixelFormat format;
    BitmapData lockeddata;
    INT y;

    TRACE("%p %p %p\n", hbm, hpal, bitmap);

    if(!hbm || !bitmap)
        return InvalidParameter;

    /* TODO: Support for device-dependent bitmaps */
    if(hpal){
        FIXME("no support for device-dependent bitmaps\n");
        return NotImplemented;
    }

    if (GetObjectA(hbm, sizeof(bm), &bm) != sizeof(bm))
            return InvalidParameter;

    /* TODO: Figure out the correct format for 16, 32, 64 bpp */
    switch(bm.bmBitsPixel) {
        case 1:
            format = PixelFormat1bppIndexed;
            break;
        case 4:
            format = PixelFormat4bppIndexed;
            break;
        case 8:
            format = PixelFormat8bppIndexed;
            break;
        case 24:
            format = PixelFormat24bppRGB;
            break;
        case 32:
            format = PixelFormat32bppRGB;
            break;
        case 48:
            format = PixelFormat48bppRGB;
            break;
        default:
            FIXME("don't know how to handle %d bpp\n", bm.bmBitsPixel);
            return InvalidParameter;
    }

    retval = GdipCreateBitmapFromScan0(bm.bmWidth, bm.bmHeight, 0,
        format, NULL, bitmap);

    if (retval == Ok)
    {
        retval = GdipBitmapLockBits(*bitmap, NULL, ImageLockModeWrite,
            format, &lockeddata);
        if (retval == Ok)
        {
            if (bm.bmBits)
            {
                for (y=0; y<bm.bmHeight; y++)
                {
                    memcpy((BYTE*)lockeddata.Scan0+lockeddata.Stride*y,
                           (BYTE*)bm.bmBits+bm.bmWidthBytes*(bm.bmHeight-1-y),
                           bm.bmWidthBytes);
                }
            }
            else
            {
                HDC hdc;
                HBITMAP oldhbm;
                BITMAPINFO *pbmi;
                INT src_height, dst_stride;
                BYTE *dst_bits;

                hdc = CreateCompatibleDC(NULL);
                oldhbm = SelectObject(hdc, hbm);

                pbmi = GdipAlloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));

                if (pbmi)
                {
                    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
                    pbmi->bmiHeader.biBitCount = 0;

                    GetDIBits(hdc, hbm, 0, 0, NULL, pbmi, DIB_RGB_COLORS);

                    src_height = abs(pbmi->bmiHeader.biHeight);

                    if (pbmi->bmiHeader.biHeight > 0)
                    {
                        dst_bits = (BYTE*)lockeddata.Scan0+lockeddata.Stride*(src_height-1);
                        dst_stride = -lockeddata.Stride;
                    }
                    else
                    {
                        dst_bits = lockeddata.Scan0;
                        dst_stride = lockeddata.Stride;
                    }

                    for (y=0; y<src_height; y++)
                    {
                        GetDIBits(hdc, hbm, y, 1, dst_bits+dst_stride*y,
                            pbmi, DIB_RGB_COLORS);
                    }

                    GdipFree(pbmi);
                }
                else
                    retval = OutOfMemory;

                SelectObject(hdc, oldhbm);
                DeleteDC(hdc);
            }

            GdipBitmapUnlockBits(*bitmap, &lockeddata);
        }
    }

    return retval;
}

GpStatus WINGDIPAPI GdipDeleteEffect(CGpEffect *effect)
{
    FIXME("(%p): stub\n", effect);
    /* note: According to Jose Roca's GDI+ Docs, this is not implemented
     * in Windows's gdiplus */
    return NotImplemented;
}

/*****************************************************************************
 * GdipSetEffectParameters [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipSetEffectParameters(CGpEffect *effect,
    const VOID *params, const UINT size)
{
    static int calls;

    TRACE("(%p,%p,%u)\n", effect, params, size);

    if(!(calls++))
        FIXME("not implemented\n");

    return NotImplemented;
}

/*****************************************************************************
 * GdipGetImageFlags [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageFlags(GpImage *image, UINT *flags)
{
    TRACE("%p %p\n", image, flags);

    if(!image || !flags)
        return InvalidParameter;

    *flags = image->flags;

    return Ok;
}

GpStatus WINGDIPAPI GdipTestControl(GpTestControlEnum control, void *param)
{
    TRACE("(%d, %p)\n", control, param);

    switch(control){
        case TestControlForceBilinear:
            if(param)
                FIXME("TestControlForceBilinear not handled\n");
            break;
        case TestControlNoICM:
            if(param)
                FIXME("TestControlNoICM not handled\n");
            break;
        case TestControlGetBuildNumber:
            *((DWORD*)param) = 3102;
            break;
    }

    return Ok;
}

GpStatus WINGDIPAPI GdipRecordMetafileFileName(GDIPCONST WCHAR* fileName,
                            HDC hdc, EmfType type, GDIPCONST GpRectF *pFrameRect,
                            MetafileFrameUnit frameUnit, GDIPCONST WCHAR *desc,
                            GpMetafile **metafile)
{
    FIXME("%s %p %d %p %d %s %p stub!\n", debugstr_w(fileName), hdc, type, pFrameRect,
                                 frameUnit, debugstr_w(desc), metafile);

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipRecordMetafileFileNameI(GDIPCONST WCHAR* fileName, HDC hdc, EmfType type,
                            GDIPCONST GpRect *pFrameRect, MetafileFrameUnit frameUnit,
                            GDIPCONST WCHAR *desc, GpMetafile **metafile)
{
    FIXME("%s %p %d %p %d %s %p stub!\n", debugstr_w(fileName), hdc, type, pFrameRect,
                                 frameUnit, debugstr_w(desc), metafile);

    return NotImplemented;
}

GpStatus WINGDIPAPI GdipImageForceValidation(GpImage *image)
{
    FIXME("%p\n", image);

    return Ok;
}

/*****************************************************************************
 * GdipGetImageThumbnail [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipGetImageThumbnail(GpImage *image, UINT width, UINT height,
                            GpImage **ret_image, GetThumbnailImageAbort cb,
                            VOID * cb_data)
{
    FIXME("(%p %u %u %p %p %p) stub\n",
        image, width, height, ret_image, cb, cb_data);
    return NotImplemented;
}

/*****************************************************************************
 * GdipImageRotateFlip [GDIPLUS.@]
 */
GpStatus WINGDIPAPI GdipImageRotateFlip(GpImage *image, RotateFlipType type)
{
    FIXME("(%p %u) stub\n", image, type);
    return NotImplemented;
}