Sweden-Number/dlls/dwrite/gdiinterop.c

/*
 *    GDI Interop
 *
 * Copyright 2011 Huw Davies
 * Copyright 2012, 2014 Nikolay Sivov for CodeWeavers
 *
 * 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
 */

#define COBJMACROS

#include <stdarg.h>

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

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(dwrite);

struct gdiinterop {
    IDWriteGdiInterop IDWriteGdiInterop_iface;
    IDWriteFactory2 *factory;
};

struct dib_data {
    DWORD *ptr;
    int stride;
    int width;
};

struct rendertarget {
    IDWriteBitmapRenderTarget1 IDWriteBitmapRenderTarget1_iface;
    LONG ref;

    IDWriteFactory *factory;
    DWRITE_TEXT_ANTIALIAS_MODE antialiasmode;
    FLOAT ppdip;
    DWRITE_MATRIX m;
    SIZE size;
    HDC hdc;
    struct dib_data dib;
};

static inline int get_dib_stride(int width, int bpp)
{
    return ((width * bpp + 31) >> 3) & ~3;
}

static HRESULT create_target_dibsection(struct rendertarget *target, UINT32 width, UINT32 height)
{
    char bmibuf[FIELD_OFFSET(BITMAPINFO, bmiColors[256])];
    BITMAPINFO *bmi = (BITMAPINFO*)bmibuf;
    HBITMAP hbm;

    target->size.cx = width;
    target->size.cy = height;

    memset(bmi, 0, sizeof(bmibuf));
    bmi->bmiHeader.biSize = sizeof(bmi->bmiHeader);
    bmi->bmiHeader.biHeight = -height;
    bmi->bmiHeader.biWidth = width;
    bmi->bmiHeader.biBitCount = 32;
    bmi->bmiHeader.biPlanes = 1;
    bmi->bmiHeader.biCompression = BI_RGB;

    hbm = CreateDIBSection(target->hdc, bmi, DIB_RGB_COLORS, (void**)&target->dib.ptr, NULL, 0);
    if (!hbm) {
        hbm = CreateBitmap(1, 1, 1, 1, NULL);
        target->dib.ptr = NULL;
        target->dib.stride = 0;
        target->dib.width = 0;
    }
    else {
        target->dib.stride = get_dib_stride(width, 32);
        target->dib.width = width;
    }

    DeleteObject(SelectObject(target->hdc, hbm));
    return S_OK;
}

static inline struct rendertarget *impl_from_IDWriteBitmapRenderTarget1(IDWriteBitmapRenderTarget1 *iface)
{
    return CONTAINING_RECORD(iface, struct rendertarget, IDWriteBitmapRenderTarget1_iface);
}

static inline struct gdiinterop *impl_from_IDWriteGdiInterop(IDWriteGdiInterop *iface)
{
    return CONTAINING_RECORD(iface, struct gdiinterop, IDWriteGdiInterop_iface);
}

static HRESULT WINAPI rendertarget_QueryInterface(IDWriteBitmapRenderTarget1 *iface, REFIID riid, void **obj)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), obj);

    if (IsEqualIID(riid, &IID_IDWriteBitmapRenderTarget1) ||
        IsEqualIID(riid, &IID_IDWriteBitmapRenderTarget) ||
        IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IDWriteBitmapRenderTarget1_AddRef(iface);
        return S_OK;
    }

    *obj = NULL;

    return E_NOINTERFACE;
}

static ULONG WINAPI rendertarget_AddRef(IDWriteBitmapRenderTarget1 *iface)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    ULONG ref = InterlockedIncrement(&This->ref);
    TRACE("(%p)->(%d)\n", This, ref);
    return ref;
}

static ULONG WINAPI rendertarget_Release(IDWriteBitmapRenderTarget1 *iface)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    ULONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p)->(%d)\n", This, ref);

    if (!ref)
    {
        IDWriteFactory_Release(This->factory);
        DeleteDC(This->hdc);
        heap_free(This);
    }

    return ref;
}

static inline DWORD *get_pixel_ptr_32(struct dib_data *dib, int x, int y)
{
    return (DWORD *)((BYTE*)dib->ptr + y * dib->stride + x * 4);
}

static void blit_8(struct dib_data *dib, const BYTE *src, const RECT *rect, DWORD text_pixel)
{
    DWORD *dst_ptr = get_pixel_ptr_32(dib, rect->left, rect->top);
    int x, y, src_width = rect->right - rect->left;

    for (y = rect->top; y < rect->bottom; y++) {
        for (x = 0; x < src_width; x++) {
            if (src[x] < DWRITE_ALPHA_MAX) continue;
            dst_ptr[x] = text_pixel;
        }

        src += src_width;
        dst_ptr += dib->stride / 4;
    }
}

static inline BYTE blend_color(BYTE dst, BYTE src, BYTE alpha)
{
    return (src * alpha + dst * (255 - alpha) + 127) / 255;
}

static inline DWORD blend_subpixel(BYTE r, BYTE g, BYTE b, DWORD text, const BYTE *alpha)
{
    return blend_color(r, text >> 16, alpha[0]) << 16 |
           blend_color(g, text >> 8,  alpha[1]) << 8  |
           blend_color(b, text,       alpha[2]);
}

static void blit_subpixel_888(struct dib_data *dib, int dib_width, const BYTE *src,
    const RECT *rect, DWORD text_pixel)
{
    DWORD *dst_ptr = get_pixel_ptr_32(dib, rect->left, rect->top);
    int x, y, src_width = rect->right - rect->left;

    for (y = rect->top; y < rect->bottom; y++) {
        for (x = 0; x < src_width; x++) {
            if (src[3*x] == 0 && src[3*x+1] == 0 && src[3*x+2] == 0) continue;
            dst_ptr[x] = blend_subpixel(dst_ptr[x] >> 16, dst_ptr[x] >> 8, dst_ptr[x], text_pixel, &src[3*x]);
        }
        dst_ptr += dib->stride / 4;
        src += src_width * 3;
    }
}

static HRESULT WINAPI rendertarget_DrawGlyphRun(IDWriteBitmapRenderTarget1 *iface,
    FLOAT originX, FLOAT originY, DWRITE_MEASURING_MODE measuring_mode,
    DWRITE_GLYPH_RUN const *run, IDWriteRenderingParams *params, COLORREF color,
    RECT *bbox_ret)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    IDWriteGlyphRunAnalysis *analysis;
    DWRITE_RENDERING_MODE rendermode;
    DWRITE_TEXTURE_TYPE texturetype;
    RECT target, bounds;
    HRESULT hr;

    TRACE("(%p)->(%.2f %.2f %d %p %p 0x%08x %p)\n", This, originX, originY,
        measuring_mode, run, params, color, bbox_ret);

    if (!This->dib.ptr)
        return S_OK;

    hr = IDWriteFontFace_GetRecommendedRenderingMode(run->fontFace, run->fontEmSize,
        This->ppdip, measuring_mode, params, &rendermode);
    if (FAILED(hr))
        return hr;

    /* FIXME: outline mode rendering is not supported for this target yet */
    if (rendermode == DWRITE_RENDERING_MODE_OUTLINE)
        rendermode = DWRITE_RENDERING_MODE_ALIASED;

    hr = IDWriteFactory_CreateGlyphRunAnalysis(This->factory,
        run, This->ppdip, &This->m, rendermode, measuring_mode,
        originX, originY, &analysis);
    if (FAILED(hr)) {
        WARN("failed to create analysis instance, 0x%08x\n", hr);
        return hr;
    }

    SetRectEmpty(&bounds);
    texturetype = DWRITE_TEXTURE_ALIASED_1x1;
    hr = IDWriteGlyphRunAnalysis_GetAlphaTextureBounds(analysis, DWRITE_TEXTURE_ALIASED_1x1, &bounds);
    if (FAILED(hr) || IsRectEmpty(&bounds)) {
        hr = IDWriteGlyphRunAnalysis_GetAlphaTextureBounds(analysis, DWRITE_TEXTURE_CLEARTYPE_3x1, &bounds);
        texturetype = DWRITE_TEXTURE_CLEARTYPE_3x1;
    }

    target.left = target.top = 0;
    target.right = This->size.cx;
    target.bottom = This->size.cy;

    SetRectEmpty(bbox_ret);
    if (IntersectRect(&target, &target, &bounds)) {
        UINT32 size = (target.right - target.left) * (target.bottom - target.top);
        BYTE *bitmap;

        if (texturetype == DWRITE_TEXTURE_CLEARTYPE_3x1)
            size *= 3;
        bitmap = heap_alloc_zero(size);
        hr = IDWriteGlyphRunAnalysis_CreateAlphaTexture(analysis, texturetype, &target, bitmap, size);
        if (hr == S_OK) {
            /* blit to target dib */
            if (texturetype == DWRITE_TEXTURE_ALIASED_1x1)
                blit_8(&This->dib, bitmap, &target, color);
            else
                blit_subpixel_888(&This->dib, This->size.cx, bitmap, &target, color);

            *bbox_ret = target;
        }

        heap_free(bitmap);
    }

    IDWriteGlyphRunAnalysis_Release(analysis);

    return S_OK;
}

static HDC WINAPI rendertarget_GetMemoryDC(IDWriteBitmapRenderTarget1 *iface)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    TRACE("(%p)\n", This);
    return This->hdc;
}

static FLOAT WINAPI rendertarget_GetPixelsPerDip(IDWriteBitmapRenderTarget1 *iface)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    TRACE("(%p)\n", This);
    return This->ppdip;
}

static HRESULT WINAPI rendertarget_SetPixelsPerDip(IDWriteBitmapRenderTarget1 *iface, FLOAT ppdip)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%.2f)\n", This, ppdip);

    if (ppdip <= 0.0)
        return E_INVALIDARG;

    This->ppdip = ppdip;
    return S_OK;
}

static HRESULT WINAPI rendertarget_GetCurrentTransform(IDWriteBitmapRenderTarget1 *iface, DWRITE_MATRIX *transform)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%p)\n", This, transform);

    *transform = This->m;
    return S_OK;
}

static HRESULT WINAPI rendertarget_SetCurrentTransform(IDWriteBitmapRenderTarget1 *iface, DWRITE_MATRIX const *transform)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%p)\n", This, transform);

    This->m = transform ? *transform : identity;
    return S_OK;
}

static HRESULT WINAPI rendertarget_GetSize(IDWriteBitmapRenderTarget1 *iface, SIZE *size)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%p)\n", This, size);
    *size = This->size;
    return S_OK;
}

static HRESULT WINAPI rendertarget_Resize(IDWriteBitmapRenderTarget1 *iface, UINT32 width, UINT32 height)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%u %u)\n", This, width, height);

    if (This->size.cx == width && This->size.cy == height)
        return S_OK;

    return create_target_dibsection(This, width, height);
}

static DWRITE_TEXT_ANTIALIAS_MODE WINAPI rendertarget_GetTextAntialiasMode(IDWriteBitmapRenderTarget1 *iface)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);
    TRACE("(%p)\n", This);
    return This->antialiasmode;
}

static HRESULT WINAPI rendertarget_SetTextAntialiasMode(IDWriteBitmapRenderTarget1 *iface, DWRITE_TEXT_ANTIALIAS_MODE mode)
{
    struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget1(iface);

    TRACE("(%p)->(%d)\n", This, mode);

    if ((DWORD)mode > DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE)
        return E_INVALIDARG;

    This->antialiasmode = mode;
    return S_OK;
}

static const IDWriteBitmapRenderTarget1Vtbl rendertargetvtbl = {
    rendertarget_QueryInterface,
    rendertarget_AddRef,
    rendertarget_Release,
    rendertarget_DrawGlyphRun,
    rendertarget_GetMemoryDC,
    rendertarget_GetPixelsPerDip,
    rendertarget_SetPixelsPerDip,
    rendertarget_GetCurrentTransform,
    rendertarget_SetCurrentTransform,
    rendertarget_GetSize,
    rendertarget_Resize,
    rendertarget_GetTextAntialiasMode,
    rendertarget_SetTextAntialiasMode
};

static HRESULT create_rendertarget(IDWriteFactory *factory, HDC hdc, UINT32 width, UINT32 height, IDWriteBitmapRenderTarget **ret)
{
    struct rendertarget *target;
    HRESULT hr;

    *ret = NULL;

    target = heap_alloc(sizeof(struct rendertarget));
    if (!target) return E_OUTOFMEMORY;

    target->IDWriteBitmapRenderTarget1_iface.lpVtbl = &rendertargetvtbl;
    target->ref = 1;

    target->hdc = CreateCompatibleDC(hdc);
    hr = create_target_dibsection(target, width, height);
    if (FAILED(hr)) {
        IDWriteBitmapRenderTarget1_Release(&target->IDWriteBitmapRenderTarget1_iface);
        return hr;
    }

    target->m = identity;
    target->ppdip = 1.0;
    target->antialiasmode = DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE;
    target->factory = factory;
    IDWriteFactory_AddRef(factory);

    *ret = (IDWriteBitmapRenderTarget*)&target->IDWriteBitmapRenderTarget1_iface;

    return S_OK;
}

static HRESULT WINAPI gdiinterop_QueryInterface(IDWriteGdiInterop *iface, REFIID riid, void **obj)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);

    TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), obj);

    if (IsEqualIID(riid, &IID_IDWriteGdiInterop) ||
        IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IDWriteGdiInterop_AddRef(iface);
        return S_OK;
    }

    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI gdiinterop_AddRef(IDWriteGdiInterop *iface)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    TRACE("(%p)\n", This);
    return IDWriteFactory2_AddRef(This->factory);
}

static ULONG WINAPI gdiinterop_Release(IDWriteGdiInterop *iface)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    TRACE("(%p)\n", This);
    return IDWriteFactory2_Release(This->factory);
}

static HRESULT WINAPI gdiinterop_CreateFontFromLOGFONT(IDWriteGdiInterop *iface,
    LOGFONTW const *logfont, IDWriteFont **font)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    IDWriteFontCollection *collection;
    IDWriteFontFamily *family;
    DWRITE_FONT_STYLE style;
    BOOL exists = FALSE;
    UINT32 index;
    HRESULT hr;

    TRACE("(%p)->(%p %p)\n", This, logfont, font);

    *font = NULL;

    if (!logfont) return E_INVALIDARG;

    hr = IDWriteFactory2_GetSystemFontCollection(This->factory, &collection, FALSE);
    if (FAILED(hr)) {
        ERR("failed to get system font collection: 0x%08x.\n", hr);
        return hr;
    }

    hr = IDWriteFontCollection_FindFamilyName(collection, logfont->lfFaceName, &index, &exists);
    if (FAILED(hr)) {
        IDWriteFontCollection_Release(collection);
        goto done;
    }

    if (!exists) {
        hr = DWRITE_E_NOFONT;
        goto done;
    }

    hr = IDWriteFontCollection_GetFontFamily(collection, index, &family);
    if (FAILED(hr))
        goto done;

    style = logfont->lfItalic ? DWRITE_FONT_STYLE_ITALIC : DWRITE_FONT_STYLE_NORMAL;
    hr = IDWriteFontFamily_GetFirstMatchingFont(family, logfont->lfWeight, DWRITE_FONT_STRETCH_NORMAL, style, font);
    IDWriteFontFamily_Release(family);

done:
    IDWriteFontCollection_Release(collection);
    return hr;
}

static HRESULT WINAPI gdiinterop_ConvertFontToLOGFONT(IDWriteGdiInterop *iface,
    IDWriteFont *font, LOGFONTW *logfont, BOOL *is_systemfont)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    static const WCHAR enusW[] = {'e','n','-','u','s',0};
    DWRITE_FONT_SIMULATIONS simulations;
    IDWriteFontCollection *collection;
    IDWriteLocalizedStrings *name;
    IDWriteFontFamily *family;
    DWRITE_FONT_STYLE style;
    UINT32 index;
    BOOL exists;
    HRESULT hr;

    TRACE("(%p)->(%p %p %p)\n", This, font, logfont, is_systemfont);

    *is_systemfont = FALSE;

    if (!font)
        return E_INVALIDARG;

    hr = IDWriteFont_GetFontFamily(font, &family);
    if (FAILED(hr))
        return hr;

    hr = IDWriteFontFamily_GetFontCollection(family, &collection);
    IDWriteFontFamily_Release(family);
    if (FAILED(hr))
        return hr;

    *is_systemfont = is_system_collection(collection);
    IDWriteFontCollection_Release(collection);

    simulations = IDWriteFont_GetSimulations(font);
    style = IDWriteFont_GetStyle(font);

    logfont->lfCharSet = DEFAULT_CHARSET;
    logfont->lfWeight = IDWriteFont_GetWeight(font);
    logfont->lfItalic = style == DWRITE_FONT_STYLE_ITALIC || (simulations & DWRITE_FONT_SIMULATIONS_OBLIQUE);
    logfont->lfOutPrecision = OUT_OUTLINE_PRECIS;
    logfont->lfFaceName[0] = 0;

    exists = FALSE;
    hr = IDWriteFont_GetInformationalStrings(font, DWRITE_INFORMATIONAL_STRING_WIN32_FAMILY_NAMES, &name, &exists);
    if (FAILED(hr) || !exists)
        return hr;

    IDWriteLocalizedStrings_FindLocaleName(name, enusW, &index, &exists);
    IDWriteLocalizedStrings_GetString(name, index, logfont->lfFaceName, sizeof(logfont->lfFaceName)/sizeof(WCHAR));
    IDWriteLocalizedStrings_Release(name);

    return S_OK;
}

static HRESULT WINAPI gdiinterop_ConvertFontFaceToLOGFONT(IDWriteGdiInterop *iface,
    IDWriteFontFace *fontface, LOGFONTW *logfont)
{
    static const WCHAR enusW[] = {'e','n','-','u','s',0};
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    IDWriteLocalizedStrings *familynames;
    DWRITE_FONT_SIMULATIONS simulations;
    DWRITE_FONT_FACE_TYPE face_type;
    struct dwrite_font_props props;
    IDWriteFontFileStream *stream;
    IDWriteFontFile *file = NULL;
    UINT32 index;
    BOOL exists;
    HRESULT hr;

    TRACE("(%p)->(%p %p)\n", This, fontface, logfont);

    memset(logfont, 0, sizeof(*logfont));

    index = 1;
    hr = IDWriteFontFace_GetFiles(fontface, &index, &file);
    if (FAILED(hr) || !file)
        return hr;

    hr = get_filestream_from_file(file, &stream);
    if (FAILED(hr)) {
        IDWriteFontFile_Release(file);
        return hr;
    }

    index = IDWriteFontFace_GetIndex(fontface);
    face_type = IDWriteFontFace_GetType(fontface);
    opentype_get_font_properties(stream, face_type, index, &props);
    hr = get_family_names_from_stream(stream, index, face_type, &familynames);
    IDWriteFontFile_Release(file);
    IDWriteFontFileStream_Release(stream);
    if (FAILED(hr))
        return hr;

    simulations = IDWriteFontFace_GetSimulations(fontface);

    logfont->lfCharSet = DEFAULT_CHARSET;
    logfont->lfWeight = props.weight;
    logfont->lfItalic = props.style == DWRITE_FONT_STYLE_ITALIC || (simulations & DWRITE_FONT_SIMULATIONS_OBLIQUE);
    logfont->lfOutPrecision = OUT_OUTLINE_PRECIS;
    logfont->lfFaceName[0] = 0;

    exists = FALSE;
    hr = IDWriteLocalizedStrings_FindLocaleName(familynames, enusW, &index, &exists);
    if (FAILED(hr) || !exists) {
        /* fallback to 0 index */
        if (IDWriteLocalizedStrings_GetCount(familynames) > 0)
            index = 0;
        else {
            IDWriteLocalizedStrings_Release(familynames);
            return E_FAIL;
        }
    }

    hr = IDWriteLocalizedStrings_GetString(familynames, index, logfont->lfFaceName, sizeof(logfont->lfFaceName)/sizeof(WCHAR));
    IDWriteLocalizedStrings_Release(familynames);

    return hr;
}

static HRESULT WINAPI gdiinterop_CreateFontFaceFromHdc(IDWriteGdiInterop *iface,
    HDC hdc, IDWriteFontFace **fontface)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    IDWriteFont *font;
    LOGFONTW logfont;
    HFONT hfont;
    HRESULT hr;

    TRACE("(%p)->(%p %p)\n", This, hdc, fontface);

    *fontface = NULL;

    hfont = GetCurrentObject(hdc, OBJ_FONT);
    if (!hfont)
        return E_INVALIDARG;
    GetObjectW(hfont, sizeof(logfont), &logfont);

    hr = IDWriteGdiInterop_CreateFontFromLOGFONT(iface, &logfont, &font);
    if (FAILED(hr))
        return hr;

    hr = IDWriteFont_CreateFontFace(font, fontface);
    IDWriteFont_Release(font);

    return hr;
}

static HRESULT WINAPI gdiinterop_CreateBitmapRenderTarget(IDWriteGdiInterop *iface,
    HDC hdc, UINT32 width, UINT32 height, IDWriteBitmapRenderTarget **target)
{
    struct gdiinterop *This = impl_from_IDWriteGdiInterop(iface);
    TRACE("(%p)->(%p %u %u %p)\n", This, hdc, width, height, target);
    return create_rendertarget((IDWriteFactory*)This->factory, hdc, width, height, target);
}

static const struct IDWriteGdiInteropVtbl gdiinteropvtbl = {
    gdiinterop_QueryInterface,
    gdiinterop_AddRef,
    gdiinterop_Release,
    gdiinterop_CreateFontFromLOGFONT,
    gdiinterop_ConvertFontToLOGFONT,
    gdiinterop_ConvertFontFaceToLOGFONT,
    gdiinterop_CreateFontFaceFromHdc,
    gdiinterop_CreateBitmapRenderTarget
};

HRESULT create_gdiinterop(IDWriteFactory2 *factory, IDWriteGdiInterop **ret)
{
    struct gdiinterop *This;

    *ret = NULL;

    This = heap_alloc(sizeof(struct gdiinterop));
    if (!This) return E_OUTOFMEMORY;

    This->IDWriteGdiInterop_iface.lpVtbl = &gdiinteropvtbl;
    This->factory = factory;

    *ret= &This->IDWriteGdiInterop_iface;
    return S_OK;
}

void release_gdiinterop(IDWriteGdiInterop *iface)
{
    struct gdiinterop *interop = impl_from_IDWriteGdiInterop(iface);
    heap_free(interop);
}