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gdiplus: Use StretchBlt instead of GdiAlphaBlend if device doesn't support alpha blending.

This commit is contained in:
Dmitry Timoshkov 2012-04-13 14:03:49 +09:00 committed by Alexandre Julliard
parent 1dba866e61
commit 600cbb7874
1 changed files with 32 additions and 31 deletions
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63
dlls/gdiplus/graphics.c
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@ -340,6 +340,30 @@ static void transform_and_round_points(GpGraphics *graphics, POINT *pti,
}
}
static void gdi_alpha_blend(GpGraphics *graphics, INT dst_x, INT dst_y, INT dst_width, INT dst_height,
HDC hdc, INT src_x, INT src_y, INT src_width, INT src_height)
{
if (GetDeviceCaps(graphics->hdc, SHADEBLENDCAPS) == SB_NONE)
{
TRACE("alpha blending not supported by device, fallback to StretchBlt\n");
StretchBlt(graphics->hdc, dst_x, dst_y, dst_width, dst_height,
hdc, src_x, src_y, src_width, src_height, SRCCOPY);
}
else
{
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 255;
bf.AlphaFormat = AC_SRC_ALPHA;
GdiAlphaBlend(graphics->hdc, dst_x, dst_y, dst_width, dst_height,
hdc, src_x, src_y, src_width, src_height, bf);
}
}
/* Draw non-premultiplied ARGB data to the given graphics object */
static GpStatus alpha_blend_pixels(GpGraphics *graphics, INT dst_x, INT dst_y,
const BYTE *src, INT src_width, INT src_height, INT src_stride)
@ -370,10 +394,9 @@ static GpStatus alpha_blend_pixels(GpGraphics *graphics, INT dst_x, INT dst_y,
else
{
HDC hdc;
HBITMAP hbitmap, old_hbm=NULL;
HBITMAP hbitmap;
BITMAPINFOHEADER bih;
BYTE *temp_bits;
BLENDFUNCTION bf;
hdc = CreateCompatibleDC(0);
@ -395,17 +418,9 @@ static GpStatus alpha_blend_pixels(GpGraphics *graphics, INT dst_x, INT dst_y,
convert_32bppARGB_to_32bppPARGB(src_width, src_height, temp_bits,
4 * src_width, src, src_stride);
old_hbm = SelectObject(hdc, hbitmap);
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 255;
bf.AlphaFormat = AC_SRC_ALPHA;
GdiAlphaBlend(graphics->hdc, dst_x, dst_y, src_width, src_height,
hdc, 0, 0, src_width, src_height, bf);
SelectObject(hdc, old_hbm);
SelectObject(hdc, hbitmap);
gdi_alpha_blend(graphics, dst_x, dst_y, src_width, src_height,
hdc, 0, 0, src_width, src_height);
DeleteDC(hdc);
DeleteObject(hbitmap);
@ -918,19 +933,12 @@ static void brush_fill_path(GpGraphics *graphics, GpBrush* brush)
if (GetClipBox(graphics->hdc, &rc) != NULLREGION)
{
HDC hdc = CreateCompatibleDC(NULL);
BLENDFUNCTION bf;
if (!hdc) break;
SelectObject(hdc, bmp);
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 255;
bf.AlphaFormat = AC_SRC_ALPHA;
GdiAlphaBlend(graphics->hdc, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top, hdc, 0, 0, 1, 1, bf);
gdi_alpha_blend(graphics, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top,
hdc, 0, 0, 1, 1);
DeleteDC(hdc);
}
@ -3288,15 +3296,8 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
if (bitmap->format & (PixelFormatAlpha|PixelFormatPAlpha))
{
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = 255;
bf.AlphaFormat = AC_SRC_ALPHA;
GdiAlphaBlend(graphics->hdc, pti[0].x, pti[0].y, pti[1].x-pti[0].x, pti[2].y-pti[0].y,
hdc, srcx, srcy, srcwidth, srcheight, bf);
gdi_alpha_blend(graphics, pti[0].x, pti[0].y, pti[1].x - pti[0].x, pti[2].y - pti[0].y,
hdc, srcx, srcy, srcwidth, srcheight);
}
else
{