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Sweden-Number/objects/dib.c

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/*
* GDI device-independent bitmaps
*
* Copyright 1993,1994 Alexandre Julliard
*/
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "dc.h"
#include "bitmap.h"
#include "callback.h"
#include "palette.h"
#include "stackframe.h"
#include "stddebug.h"
#include "color.h"
#include "debug.h"
#include "xmalloc.h"
extern void CLIPPING_UpdateGCRegion(DC* );
/***********************************************************************
* DIB_GetImageWidthBytes
*
* Return the width of an X image in bytes
*/
int DIB_GetImageWidthBytes( int width, int depth )
{
int words;
switch(depth)
{
case 1: words = (width + 31) / 32; break;
case 4: words = (width + 7) / 8; break;
case 8: words = (width + 3) / 4; break;
case 15:
case 16: words = (width + 1) / 2; break;
case 24: words = width; break;
default:
fprintf(stderr, "DIB: unsupported depth %d.\n", depth );
exit(1);
}
return 4 * words;
}
/***********************************************************************
* DIB_BitmapInfoSize
*
* Return the size of the bitmap info structure.
*/
int DIB_BitmapInfoSize( BITMAPINFO * info, WORD coloruse )
{
int colors;
if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
{
BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)info;
colors = (core->bcBitCount != 24) ? 1 << core->bcBitCount : 0;
return sizeof(BITMAPCOREHEADER) + colors *
((coloruse == DIB_RGB_COLORS) ? sizeof(RGBTRIPLE) : sizeof(WORD));
}
else /* assume BITMAPINFOHEADER */
{
colors = info->bmiHeader.biClrUsed;
if (!colors && (info->bmiHeader.biBitCount != 24))
colors = 1 << info->bmiHeader.biBitCount;
return sizeof(BITMAPINFOHEADER) + colors *
((coloruse == DIB_RGB_COLORS) ? sizeof(RGBQUAD) : sizeof(WORD));
}
}
/***********************************************************************
* DIB_DIBmpToImage
*
* Create an XImage pointing to the bitmap data.
*/
static XImage *DIB_DIBmpToImage( BITMAPINFOHEADER * bmp, void * bmpData )
{
extern void _XInitImageFuncPtrs( XImage* );
XImage * image;
image = XCreateImage(display, DefaultVisualOfScreen( screen ),
bmp->biBitCount, ZPixmap, 0, bmpData,
bmp->biWidth, bmp->biHeight, 32,
DIB_GetImageWidthBytes(bmp->biWidth,bmp->biBitCount));
if (!image) return 0;
image->byte_order = MSBFirst;
image->bitmap_bit_order = MSBFirst;
image->bitmap_unit = 16;
_XInitImageFuncPtrs(image);
return image;
}
/***********************************************************************
* DIB_GetBitmapInfo
*
* Get the info from a bitmap header.
* Return 1 for INFOHEADER, 0 for COREHEADER, -1 for error.
*/
static int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, DWORD *width,
DWORD *height, WORD *bpp )
{
if (header->biSize == sizeof(BITMAPINFOHEADER))
{
*width = header->biWidth;
*height = header->biHeight;
*bpp = header->biBitCount;
return 1;
}
if (header->biSize == sizeof(BITMAPCOREHEADER))
{
BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)header;
*width = core->bcWidth;
*height = core->bcHeight;
*bpp = core->bcBitCount;
return 0;
}
fprintf( stderr, "DIB_GetBitmapInfo: wrong size (%ld) for header\n",
header->biSize );
return -1;
}
/***********************************************************************
* DIB_BuildColorMap
*
* Build the color map from the bitmap palette. Should not be called
* for a 24-bit deep bitmap.
*/
static int *DIB_BuildColorMap( DC *dc, WORD coloruse, WORD depth,
BITMAPINFO *info )
{
int i, colors;
BOOL isInfo;
WORD *colorPtr;
int *colorMapping;
if ((isInfo = (info->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))))
{
colors = info->bmiHeader.biClrUsed;
if (!colors) colors = 1 << info->bmiHeader.biBitCount;
colorPtr = (WORD *)info->bmiColors;
}
else /* assume BITMAPCOREINFO */
{
colors = 1 << ((BITMAPCOREHEADER *)&info->bmiHeader)->bcBitCount;
colorPtr = (WORD *)((BITMAPCOREINFO *)info)->bmciColors;
}
if (!(colorMapping = (int *)malloc( colors * sizeof(int) ))) return NULL;
if (coloruse == DIB_RGB_COLORS)
{
if (isInfo)
{
RGBQUAD * rgb = (RGBQUAD *)colorPtr;
if (depth == 1) /* Monochrome */
for (i = 0; i < colors; i++, rgb++)
colorMapping[i] = (rgb->rgbRed + rgb->rgbGreen +
rgb->rgbBlue > 255*3/2);
else
for (i = 0; i < colors; i++, rgb++)
colorMapping[i] = COLOR_ToPhysical( dc, RGB(rgb->rgbRed,
rgb->rgbGreen,
rgb->rgbBlue));
}
else
{
RGBTRIPLE * rgb = (RGBTRIPLE *)colorPtr;
if (depth == 1) /* Monochrome */
for (i = 0; i < colors; i++, rgb++)
colorMapping[i] = (rgb->rgbtRed + rgb->rgbtGreen +
rgb->rgbtBlue > 255*3/2);
else
for (i = 0; i < colors; i++, rgb++)
colorMapping[i] = COLOR_ToPhysical( dc, RGB(rgb->rgbtRed,
rgb->rgbtGreen,
rgb->rgbtBlue));
}
}
else /* DIB_PAL_COLORS */
{
for (i = 0; i < colors; i++, colorPtr++)
colorMapping[i] = COLOR_ToPhysical( dc, PALETTEINDEX(*colorPtr) );
}
return colorMapping;
}
/***********************************************************************
* DIB_SetImageBits_1
*
* SetDIBits for a 1-bit deep DIB.
*/
static void DIB_SetImageBits_1( WORD lines, BYTE *bits, WORD width,
int *colors, XImage *bmpImage )
{
WORD i, x;
BYTE pad, pix;
if (!(width & 31)) pad = 0;
else pad = ((32 - (width & 31)) + 7) / 8;
while (lines--)
{
for (i = width/8, x = 0; (i > 0); i--)
{
pix = *bits++;
XPutPixel( bmpImage, x++, lines, colors[pix >> 7] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 6) & 1] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 5) & 1] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 4) & 1] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 3) & 1] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 2) & 1] );
XPutPixel( bmpImage, x++, lines, colors[(pix >> 1) & 1] );
XPutPixel( bmpImage, x++, lines, colors[pix & 1] );
}
pix = *bits;
switch(width & 7)
{
case 7: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 6: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 5: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 4: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 3: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 2: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] ); pix <<= 1;
case 1: XPutPixel( bmpImage, x++, lines, colors[pix >> 7] );
}
bits += pad;
}
}
/***********************************************************************
* DIB_SetImageBits_4
*
* SetDIBits for a 4-bit deep DIB.
*/
static void DIB_SetImageBits_4( WORD lines, BYTE *bits, WORD width,
int *colors, XImage *bmpImage )
{
WORD i, x;
BYTE pad;
if (!(width & 7)) pad = 0;
else pad = ((8 - (width & 7)) + 1) / 2;
while (lines--)
{
for (i = width/2, x = 0; i > 0; i--)
{
BYTE pix = *bits++;
XPutPixel( bmpImage, x++, lines, colors[pix >> 4] );
XPutPixel( bmpImage, x++, lines, colors[pix & 0x0f] );
}
if (width & 1) XPutPixel( bmpImage, x, lines, colors[*bits >> 4] );
bits += pad;
}
}
#define check_xy(x,y) \
if (x > width) { \
x = 0; \
if (lines) \
lines--; \
}
/***********************************************************************
* DIB_SetImageBits_RLE4
*
* SetDIBits for a 4-bit deep compressed DIB.
*/
static void DIB_SetImageBits_RLE4( WORD lines, BYTE *bits, WORD width,
int *colors, XImage *bmpImage )
{
int x = 0, c, length;
BYTE *begin = bits;
lines--;
while ((short)lines >= 0)
{
length = *bits++;
if (length) { /* encoded */
c = *bits++;
while (length--) {
XPutPixel(bmpImage, x++, lines, colors[c >> 4]);
check_xy(x, y);
if (length) {
length--;
XPutPixel(bmpImage, x++, lines, colors[c & 0xf]);
check_xy(x, y);
}
}
} else {
length = *bits++;
switch (length) {
case 0: /* eol */
x = 0;
lines--;
continue;
case 1: /* eopicture */
return;
case 2: /* delta */
x += *bits++;
lines -= *bits++;
continue;
default: /* absolute */
while (length--) {
c = *bits++;
XPutPixel(bmpImage, x++, lines, colors[c >> 4]);
check_xy(x, y);
if (length) {
length--;
XPutPixel(bmpImage, x++, lines, colors[c & 0xf]);
check_xy(x, y);
}
}
if ((bits - begin) & 1)
bits++;
}
}
}
}
/***********************************************************************
* DIB_SetImageBits_8
*
* SetDIBits for an 8-bit deep DIB.
*/
static void DIB_SetImageBits_8( WORD lines, BYTE *bits, WORD width,
int *colors, XImage *bmpImage )
{
WORD x;
BYTE pad = (4 - (width & 3)) & 3;
while (lines--)
{
for (x = 0; x < width; x++)
XPutPixel( bmpImage, x, lines, colors[*bits++] );
bits += pad;
}
}
/***********************************************************************
* DIB_SetImageBits_RLE8
*
* SetDIBits for an 8-bit deep compressed DIB.
*
* This function rewritten 941113 by James Youngman. WINE blew out when I
* first ran it because my desktop wallpaper is a (large) RLE8 bitmap.
*
* This was because the algorithm assumed that all RLE8 bitmaps end with the
* 'End of bitmap' escape code. This code is very much laxer in what it
* allows to end the expansion. Possibly too lax. See the note by
* case RleDelta. BTW, MS's documentation implies that a correct RLE8
* bitmap should end with RleEnd, but on the other hand, software exists
* that produces ones that don't and Windows 3.1 doesn't complain a bit
* about it.
*
* (No) apologies for my English spelling. [Emacs users: c-indent-level=4].
* James A. Youngman <mbcstjy@afs.man.ac.uk>
* [JAY]
*/
enum Rle8_EscapeCodes
{
/*
* Apologies for polluting your file's namespace...
*/
RleEol = 0, /* End of line */
RleEnd = 1, /* End of bitmap */
RleDelta = 2 /* Delta */
};
static void DIB_SetImageBits_RLE8(WORD lines,
BYTE *bits,
WORD width,
int *colors,
XImage *bmpImage)
{
int x; /* X-positon on each line. Increases. */
int line; /* Line #. Starts at lines-1, decreases */
BYTE *pIn = bits; /* Pointer to current position in bits */
BYTE length; /* The length pf a run */
BYTE color_index; /* index into colors[] as read from bits */
BYTE escape_code; /* See enum Rle8_EscapeCodes.*/
WORD color; /* value of colour[color_index] */
if (lines == 0) /* Let's hope this doesn't happen. */
return;
/*
* Note that the bitmap data is stored by Windows starting at the
* bottom line of the bitmap and going upwards. Within each line,
* the data is stored left-to-right. That's the reason why line
* goes from lines-1 to 0. [JAY]
*/
x = 0;
line = lines-1;
do
{
length = *pIn++;
/*
* If the length byte is not zero (which is the escape value),
* We have a run of length pixels all the same colour. The colour
* index is stored next.
*
* If the length byte is zero, we need to read the next byte to
* know what to do. [JAY]
*/
if (length != 0)
{
/*
* [Run-Length] Encoded mode
*/
color_index = (*pIn++); /* Get the colour index. */
color = colors[color_index];
while(length--)
XPutPixel(bmpImage, x++, line, color);
}
else
{
/*
* Escape codes (may be an absolute sequence though)
*/
escape_code = (*pIn++);
switch(escape_code)
{
case RleEol: /* =0, end of line */
{
x = 0;
line--;
break;
}
case RleEnd: /* =1, end of bitmap */
{
/*
* Not all RLE8 bitmaps end with this
* code. For example, Paint Shop Pro
* produces some that don't. That's (I think)
* what caused the previous implementation to
* fail. [JAY]
*/
line=-1; /* Cause exit from do loop. */
break;
}
case RleDelta: /* =2, a delta */
{
/*
* Note that deltaing to line 0
* will cause an exit from the loop,
* which may not be what is intended.
* The fact that there is a delta in the bits
* almost certainly implies that there is data
* to follow. You may feel that we should
* jump to the top of the loop to avoid exiting
* in this case.
*
* TODO: Decide what to do here in that case. [JAY]
*/
x += (*pIn++);
line -= (*pIn++);
if (line == 0)
{
dprintf_bitmap(stddeb,
"DIB_SetImageBits_RLE8(): "
"Delta to last line of bitmap "
"(wrongly?) causes loop exit\n");
}
break;
}
default: /* >2, switch to absolute mode */
{
/*
* Absolute Mode
*/
length = escape_code;
while(length--)
{
color_index = (*pIn++);
XPutPixel(bmpImage, x++, line,
colors[color_index]);
}
/*
* If you think for a moment you'll realise that the
* only time we could ever possibly read an odd
* number of bytes is when there is a 0x00 (escape),
* a value >0x02 (absolute mode) and then an odd-
* length run. Therefore this is the only place we
* need to worry about it. Everywhere else the
* bytes are always read in pairs. [JAY]
*/
if (escape_code & 1)
pIn++; /* Throw away the pad byte. */
break;
}
} /* switch (escape_code) : Escape sequence */
} /* process either an encoded sequence or an escape sequence */
/* We expect to come here more than once per line. */
} while (line >= 0); /* Do this until the bitmap is filled */
/*
* Everybody comes here at the end.
* Check how we exited the loop and print a message if it's a bit odd.
* [JAY]
*/
if ( (*(pIn-2) != 0/*escape*/) || (*(pIn-1)!= RleEnd) )
{
dprintf_bitmap(stddeb, "DIB_SetImageBits_RLE8(): End-of-bitmap "
"without (strictly) proper escape code. Last two "
"bytes were: %02X %02X.\n",
(int)*(pIn-2),
(int)*(pIn-1));
}
}
/***********************************************************************
* DIB_SetImageBits_24
*
* SetDIBits for a 24-bit deep DIB.
*/
static void DIB_SetImageBits_24( WORD lines, BYTE *bits, WORD width,
DC *dc, XImage *bmpImage )
{
WORD x;
BYTE pad = (4 - ((width*3) & 3)) & 3;
while (lines--)
{
for (x = 0; x < width; x++, bits += 3)
{
XPutPixel( bmpImage, x, lines,
COLOR_ToPhysical( dc, RGB(bits[0],bits[1],bits[2]) ));
}
bits += pad;
}
}
/***********************************************************************
* DIB_SetImageBits
*
* Transfer the bits to an X image.
* Helper function for SetDIBits() and SetDIBitsToDevice().
*/
static int DIB_SetImageBits( DC *dc, WORD lines, WORD depth, LPSTR bits,
DWORD infoWidth, WORD infoBpp, DWORD compression,
BITMAPINFO *info, WORD coloruse,
Drawable drawable, GC gc, int xSrc, int ySrc,
int xDest, int yDest, int width, int height )
{
int *colorMapping;
XImage *bmpImage;
/* Build the color mapping table */
if (infoBpp == 24) colorMapping = NULL;
else
if (!(colorMapping = DIB_BuildColorMap( dc, coloruse, depth, info )))
return 0;
if( dc->w.flags & DC_DIRTY ) CLIPPING_UpdateGCRegion(dc);
/* Transfer the pixels */
XCREATEIMAGE(bmpImage, infoWidth, lines, depth );
switch(infoBpp)
{
case 1:
DIB_SetImageBits_1( lines, bits, infoWidth,
colorMapping, bmpImage );
break;
case 4:
if (compression) DIB_SetImageBits_RLE4( lines, bits, infoWidth,
colorMapping, bmpImage );
else DIB_SetImageBits_4( lines, bits, infoWidth,
colorMapping, bmpImage );
break;
case 8:
if (compression) DIB_SetImageBits_RLE8( lines, bits, infoWidth,
colorMapping, bmpImage );
else DIB_SetImageBits_8( lines, bits, infoWidth,
colorMapping, bmpImage );
break;
case 24:
DIB_SetImageBits_24( lines, bits, infoWidth, dc, bmpImage );
break;
default:
fprintf( stderr, "Invalid depth %d for SetDIBits!\n", infoBpp );
break;
}
if (colorMapping) free(colorMapping);
XPutImage( display, drawable, gc, bmpImage, xSrc, ySrc,
xDest, yDest, width, height );
XDestroyImage( bmpImage );
return lines;
}
/***********************************************************************
* StretchDIBits (GDI.439)
*/
int StretchDIBits( HDC hdc,
WORD xDest, WORD yDest, WORD wDestWidth, WORD wDestHeight,
WORD xSrc, WORD ySrc, WORD wSrcWidth, WORD wSrcHeight,
LPSTR bits, LPBITMAPINFO info, WORD wUsage, DWORD dwRop )
{
HBITMAP hBitmap, hOldBitmap;
HDC hdcMem;
hBitmap = CreateDIBitmap( hdc, &info->bmiHeader, CBM_INIT,
bits, info, wUsage );
hdcMem = CreateCompatibleDC( hdc );
hOldBitmap = SelectObject( hdcMem, hBitmap );
StretchBlt( hdc, xDest, yDest, wDestWidth, wDestHeight,
hdcMem, xSrc, ySrc, wSrcWidth, wSrcHeight, dwRop );
SelectObject( hdcMem, hOldBitmap );
DeleteDC( hdcMem );
DeleteObject( hBitmap );
return wSrcHeight;
}
/***********************************************************************
* SetDIBits (GDI.440) (GDI32.312)
*/
INT16 SetDIBits( HDC32 hdc, HBITMAP32 hbitmap, UINT32 startscan, UINT32 lines,
LPCVOID bits, const BITMAPINFO *info, UINT32 coloruse )
{
DC * dc;
BITMAPOBJ * bmp;
DWORD width, height, compression = 0;
WORD bpp;
/* Check parameters */
if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
if (!(bmp = (BITMAPOBJ *)GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
return 0;
if (DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &bpp ) == -1)
return 0;
if (info->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))
compression = info->bmiHeader.biCompression;
if (!lines || (startscan >= (WORD)height)) return 0;
if (startscan + lines > height) lines = height - startscan;
return CallTo32_LargeStack( (int(*)())DIB_SetImageBits, 17,
dc, lines, bmp->bitmap.bmBitsPixel,
bits, width, bpp, compression, info,
coloruse, bmp->pixmap, BITMAP_GC(bmp), 0, 0, 0,
startscan, bmp->bitmap.bmWidth, lines );
}
/***********************************************************************
* SetDIBitsToDevice (GDI.443) (GDI32.313)
*/
INT16 SetDIBitsToDevice( HDC32 hdc, INT32 xDest, INT32 yDest, DWORD cx,
DWORD cy, INT32 xSrc, INT32 ySrc, UINT32 startscan,
UINT32 lines, LPCVOID bits, const BITMAPINFO *info,
UINT32 coloruse )
{
DC * dc;
DWORD width, height, compression = 0;
WORD bpp;
/* Check parameters */
if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
if (DIB_GetBitmapInfo( &info->bmiHeader, &width, &height, &bpp ) == -1)
return 0;
if (info->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))
compression = info->bmiHeader.biCompression;
if (!lines || (startscan >= height)) return 0;
if (startscan + lines > height) lines = height - startscan;
if (ySrc < startscan) ySrc = startscan;
else if (ySrc >= startscan + lines) return 0;
if (xSrc >= width) return 0;
if (ySrc + cy >= startscan + lines) cy = startscan + lines - ySrc;
if (xSrc + cx >= width) cx = width - xSrc;
if (!cx || !cy) return 0;
DC_SetupGCForText( dc ); /* To have the correct colors */
XSetFunction( display, dc->u.x.gc, DC_XROPfunction[dc->w.ROPmode-1] );
return CallTo32_LargeStack( (int(*)())DIB_SetImageBits, 17,
dc, lines, dc->w.bitsPerPixel, bits, width,
bpp, compression, info, coloruse,
dc->u.x.drawable, dc->u.x.gc,
xSrc, ySrc - startscan,
dc->w.DCOrgX + XLPTODP( dc, xDest ),
dc->w.DCOrgY + YLPTODP( dc, yDest ),
cx, cy );
}
/***********************************************************************
* GetDIBits (GDI.441)
*/
int GetDIBits( HDC hdc, HBITMAP hbitmap, WORD startscan, WORD lines,
LPSTR bits, BITMAPINFO * info, WORD coloruse )
{
DC * dc;
BITMAPOBJ * bmp;
PALETTEENTRY * palEntry;
PALETTEOBJ * palette;
XImage * bmpImage, * dibImage;
int i, x, y;
if (!lines) return 0;
if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
if (!(bmp = (BITMAPOBJ *)GDI_GetObjPtr( hbitmap, BITMAP_MAGIC )))
return 0;
if (!(palette = (PALETTEOBJ*)GDI_GetObjPtr( dc->w.hPalette, PALETTE_MAGIC )))
return 0;
/* Transfer color info */
palEntry = palette->logpalette.palPalEntry;
for (i = 0; i < info->bmiHeader.biClrUsed; i++, palEntry++)
{
if (coloruse == DIB_RGB_COLORS)
{
info->bmiColors[i].rgbRed = palEntry->peRed;
info->bmiColors[i].rgbGreen = palEntry->peGreen;
info->bmiColors[i].rgbBlue = palEntry->peBlue;
info->bmiColors[i].rgbReserved = 0;
}
else ((WORD *)info->bmiColors)[i] = (WORD)i;
}
/* Transfer the pixels (very slow...) */
if (bits)
{
bmpImage = (XImage *)CallTo32_LargeStack( (int (*)())XGetImage, 8,
display, bmp->pixmap, 0, 0, bmp->bitmap.bmWidth,
bmp->bitmap.bmHeight, AllPlanes, ZPixmap );
dibImage = DIB_DIBmpToImage( &info->bmiHeader, bits );
for (y = 0; y < lines; y++)
{
for (x = 0; x < info->bmiHeader.biWidth; x++)
{
XPutPixel( dibImage, x, y,
XGetPixel(bmpImage, x, bmp->bitmap.bmHeight-startscan-y-1) );
}
}
dibImage->data = NULL;
XDestroyImage( dibImage );
XDestroyImage( bmpImage );
}
info->bmiHeader.biCompression = 0;
return lines;
}
/***********************************************************************
* CreateDIBitmap (GDI.442)
*/
HBITMAP CreateDIBitmap( HDC hdc, BITMAPINFOHEADER * header, DWORD init,
LPVOID bits, BITMAPINFO * data, UINT coloruse )
{
HBITMAP handle;
BOOL fColor;
DWORD width, height;
WORD bpp;
if (DIB_GetBitmapInfo( header, &width, &height, &bpp ) == -1) return 0;
/* Check if we should create a monochrome or color bitmap. */
/* We create a monochrome bitmap only if it has exactly 2 */
/* colors, which are either black or white, nothing else. */
/* In all other cases, we create a color bitmap. */
if (bpp != 1) fColor = TRUE;
else if ((coloruse != DIB_RGB_COLORS) ||
(init != CBM_INIT) || !data) fColor = FALSE;
else
{
if (data->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))
{
RGBQUAD *rgb = data->bmiColors;
DWORD col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
{
rgb++;
col = RGB( rgb->rgbRed, rgb->rgbGreen, rgb->rgbBlue );
fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
}
else fColor = TRUE;
}
else if (data->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
{
RGBTRIPLE *rgb = ((BITMAPCOREINFO *)data)->bmciColors;
DWORD col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
if ((col == RGB(0,0,0)) || (col == RGB(0xff,0xff,0xff)))
{
rgb++;
col = RGB( rgb->rgbtRed, rgb->rgbtGreen, rgb->rgbtBlue );
fColor = ((col != RGB(0,0,0)) && (col != RGB(0xff,0xff,0xff)));
}
else fColor = TRUE;
}
else
{
fprintf( stderr, "CreateDIBitmap: wrong size (%ld) for data\n",
data->bmiHeader.biSize );
return 0;
}
}
/* Now create the bitmap */
handle = fColor ? CreateCompatibleBitmap( hdc, width, height ) :
CreateBitmap( width, height, 1, 1, NULL );
if (!handle) return 0;
if (init == CBM_INIT)
SetDIBits( hdc, handle, 0, height, bits, data, coloruse );
return handle;
}
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