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Jean-Claude Batista (Macadamian/Corel) 

Top-down images have a negative biHeight, the scanlines of theses
images were inverted in X11DRV_DIB_GetImageBits_xx. To prevent this I
simply changed the sign of lines, the scanlines were correctly handled
afterwards
This commit is contained in:
Alexandre Julliard 2000-05-07 18:27:57 +00:00
parent 508911b446
commit 40aa8c92a8
1 changed files with 9 additions and 1 deletions
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10
graphics/x11drv/dib.c
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@ -2878,6 +2878,14 @@ INT X11DRV_DIB_GetDIBits(
return 0; return 0;
if( lines > info->bmiHeader.biHeight ) lines = info->bmiHeader.biHeight; if( lines > info->bmiHeader.biHeight ) lines = info->bmiHeader.biHeight;
/* Top-down images have a negative biHeight, the scanlines of theses images
* were inverted in X11DRV_DIB_GetImageBits_xx
* To prevent this we simply change the sign of lines
* (the number of scan lines to copy).
* Negative lines are correctly handled by X11DRV_DIB_GetImageBits_xx.
*/
if( info->bmiHeader.biHeight < 0 && lines > 0) lines = -lines;
if( startscan >= bmp->bitmap.bmHeight ) return FALSE; if( startscan >= bmp->bitmap.bmHeight ) return FALSE;
if (DIB_GetBitmapInfo( &info->bmiHeader, &descr.infoWidth, &descr.lines, if (DIB_GetBitmapInfo( &info->bmiHeader, &descr.infoWidth, &descr.lines,
@ -3306,7 +3314,7 @@ HBITMAP X11DRV_DIB_CreateDIBSection(
bm.bmBits = MapViewOfFile(section, FILE_MAP_ALL_ACCESS, bm.bmBits = MapViewOfFile(section, FILE_MAP_ALL_ACCESS,
0L, offset, totalSize); 0L, offset, totalSize);
else if (ovr_pitch && offset) else if (ovr_pitch && offset)
bm.bmBits = offset; bm.bmBits = (LPVOID) offset;
else { else {
offset = 0; offset = 0;
bm.bmBits = VirtualAlloc(NULL, totalSize, bm.bmBits = VirtualAlloc(NULL, totalSize,