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gdi32: Add a couple of helper functions for converting and stretching DIBs.

This commit is contained in:
Alexandre Julliard 2011-09-14 11:25:19 +02:00
parent 7696168dce
commit 27516babd6
1 changed files with 45 additions and 29 deletions
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74
dlls/gdi32/bitblt.c
View File

@ -157,6 +157,45 @@ void free_heap_bits( struct gdi_image_bits *bits )
HeapFree( GetProcessHeap(), 0, bits->ptr );
}
static DWORD convert_bits( const BITMAPINFO *src_info, struct bitblt_coords *src,
BITMAPINFO *dst_info, struct gdi_image_bits *bits )
{
void *ptr;
DWORD err;
dst_info->bmiHeader.biWidth = src->visrect.right - src->visrect.left;
if (!(ptr = HeapAlloc( GetProcessHeap(), 0, get_dib_image_size( dst_info ))))
return ERROR_OUTOFMEMORY;
err = convert_bitmapinfo( src_info, bits->ptr, src, dst_info, ptr );
if (bits->free) bits->free( bits );
bits->ptr = ptr;
bits->is_copy = TRUE;
bits->free = free_heap_bits;
return err;
}
static DWORD stretch_bits( const BITMAPINFO *src_info, struct bitblt_coords *src,
BITMAPINFO *dst_info, struct bitblt_coords *dst,
struct gdi_image_bits *bits, int mode )
{
void *ptr;
DWORD err;
dst_info->bmiHeader.biWidth = dst->visrect.right - dst->visrect.left;
dst_info->bmiHeader.biHeight = dst->visrect.bottom - dst->visrect.top;
if (src_info->bmiHeader.biHeight < 0) dst_info->bmiHeader.biHeight = -dst_info->bmiHeader.biHeight;
if (!(ptr = HeapAlloc( GetProcessHeap(), 0, get_dib_image_size( dst_info ))))
return ERROR_OUTOFMEMORY;
err = stretch_bitmapinfo( src_info, bits->ptr, src, dst_info, ptr, dst, mode );
if (bits->free) bits->free( bits );
bits->ptr = ptr;
bits->is_copy = TRUE;
bits->free = free_heap_bits;
return err;
}
/* nulldrv fallback implementation using StretchDIBits */
BOOL nulldrv_StretchBlt( PHYSDEV dst_dev, struct bitblt_coords *dst,
PHYSDEV src_dev, struct bitblt_coords *src, DWORD rop )
@ -168,7 +207,6 @@ BOOL nulldrv_StretchBlt( PHYSDEV dst_dev, struct bitblt_coords *dst,
BITMAPINFO *dst_info = (BITMAPINFO *)dst_buffer;
DWORD err;
struct gdi_image_bits bits;
LPVOID ptr;
if (!(dc_src = get_dc_ptr( src_dev->hdc ))) return FALSE;
src_dev = GET_DC_PHYSDEV( dc_src, pGetImage );
@ -209,42 +247,20 @@ BOOL nulldrv_StretchBlt( PHYSDEV dst_dev, struct bitblt_coords *dst,
dst_info->bmiHeader.biClrUsed = 1;
}
dst_info->bmiHeader.biWidth = src->visrect.right - src->visrect.left;
if ((ptr = HeapAlloc( GetProcessHeap(), 0, get_dib_image_size( dst_info ))))
if (!(err = convert_bits( src_info, src, dst_info, &bits )))
{
err = convert_bitmapinfo( src_info, bits.ptr, src, dst_info, ptr );
if (bits.free) bits.free( &bits );
bits.ptr = ptr;
bits.is_copy = TRUE;
bits.free = free_heap_bits;
if (!err)
{
/* get rid of the fake 1-bpp table */
if (dst_info->bmiHeader.biClrUsed == 1) dst_info->bmiHeader.biClrUsed = 0;
err = dst_dev->funcs->pPutImage( dst_dev, 0, 0, dst_info, &bits, src, dst, rop );
}
/* get rid of the fake 1-bpp table */
if (dst_info->bmiHeader.biClrUsed == 1) dst_info->bmiHeader.biClrUsed = 0;
err = dst_dev->funcs->pPutImage( dst_dev, 0, 0, dst_info, &bits, src, dst, rop );
}
else err = ERROR_OUTOFMEMORY;
}
if (err == ERROR_TRANSFORM_NOT_SUPPORTED &&
((src->width != dst->width) || (src->height != dst->height)))
{
memcpy( src_info, dst_info, FIELD_OFFSET( BITMAPINFO, bmiColors[256] ));
dst_info->bmiHeader.biWidth = dst->visrect.right - dst->visrect.left;
dst_info->bmiHeader.biHeight = dst->visrect.bottom - dst->visrect.top;
if (src_info->bmiHeader.biHeight < 0) dst_info->bmiHeader.biHeight = -dst_info->bmiHeader.biHeight;
if ((ptr = HeapAlloc( GetProcessHeap(), 0, get_dib_image_size( dst_info ))))
{
err = stretch_bitmapinfo( src_info, bits.ptr, src, dst_info, ptr, dst,
GetStretchBltMode( dst_dev->hdc ) );
if (bits.free) bits.free( &bits );
bits.ptr = ptr;
bits.is_copy = TRUE;
bits.free = free_heap_bits;
if (!err) err = dst_dev->funcs->pPutImage( dst_dev, 0, 0, dst_info, &bits, src, dst, rop );
}
else err = ERROR_OUTOFMEMORY;
err = stretch_bits( src_info, src, dst_info, dst, &bits, GetStretchBltMode( dst_dev->hdc ));
if (!err) err = dst_dev->funcs->pPutImage( dst_dev, 0, 0, dst_info, &bits, src, dst, rop );
}
if (bits.free) bits.free( &bits );