[PATCH (try2)] gdiplus: Avoid unnecessary pre-multiplied alpha conversions in GdipDrawImagePointsRect
Vincent Povirk
madewokherd at gmail.com
Wed Apr 1 12:53:48 CDT 2015
I think we also need resample_bitmap_pixel to be set up to handle
PARGB. Nearest neighbor interpolation should work OK as is, but
bilinear interpolation uses blend_colors which only works correctly
for ARGB. (The implementation of blend_colors that we had before
9c579023f0750539bdf7815f8545c4620540387a should actually be correct
for PARGB.)
On Wed, Apr 1, 2015 at 11:38 AM, Andrew Eikum <aeikum at codeweavers.com> wrote:
> Not all of the operations we perform in the DrawImage family need to
> be post-multiplied. We can avoid doing a pre-to-post-multiplied alpha
> conversion by detecting whether we need post-multiplied ahead of time.
> Avoiding this conversion saves considerable time, about 3/1000s in my
> particular test case.
>
> ---
>
> try2: Fix return value from color_over_fgpremult
>
> dlls/gdiplus/gdiplus_private.h | 20 +++++++++++++
> dlls/gdiplus/graphics.c | 66 ++++++++++++++++++++++++++++--------------
> 2 files changed, 65 insertions(+), 21 deletions(-)
>
> diff --git a/dlls/gdiplus/gdiplus_private.h b/dlls/gdiplus/gdiplus_private.h
> index 065f5ed..57b3de3 100644
> --- a/dlls/gdiplus/gdiplus_private.h
> +++ b/dlls/gdiplus/gdiplus_private.h
> @@ -121,6 +121,26 @@ static inline ARGB color_over(ARGB bg, ARGB fg)
> return (a<<24)|(r<<16)|(g<<8)|b;
> }
>
> +/* fg is premult, bg and return value are not */
> +static inline ARGB color_over_fgpremult(ARGB bg, ARGB fg)
> +{
> + BYTE b, g, r, a;
> + BYTE bg_alpha, fg_alpha;
> +
> + fg_alpha = (fg>>24)&0xff;
> +
> + if (fg_alpha == 0) return bg;
> +
> + bg_alpha = (((bg>>24)&0xff) * (0xff-fg_alpha)) / 0xff;
> +
> + a = bg_alpha + fg_alpha;
> + b = ((bg&0xff)*bg_alpha + (fg&0xff)*0xff)/a;
> + g = (((bg>>8)&0xff)*bg_alpha + ((fg>>8)&0xff)*0xff)/a;
> + r = (((bg>>16)&0xff)*bg_alpha + ((fg>>16)&0xff)*0xff)/a;
> +
> + return (a<<24)|(r<<16)|(g<<8)|b;
> +}
> +
> extern const char *debugstr_rectf(const RectF* rc) DECLSPEC_HIDDEN;
>
> extern const char *debugstr_pointf(const PointF* pt) DECLSPEC_HIDDEN;
> diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
> index 580390f..89c108e 100644
> --- a/dlls/gdiplus/graphics.c
> +++ b/dlls/gdiplus/graphics.c
> @@ -354,9 +354,9 @@ static GpStatus get_clip_hrgn(GpGraphics *graphics, HRGN *hrgn)
> return GdipGetRegionHRgn(graphics->clip, NULL, hrgn);
> }
>
> -/* Draw non-premultiplied ARGB data to the given graphics object */
> +/* Draw ARGB data to the given graphics object */
> static GpStatus alpha_blend_bmp_pixels(GpGraphics *graphics, INT dst_x, INT dst_y,
> - const BYTE *src, INT src_width, INT src_height, INT src_stride)
> + const BYTE *src, INT src_width, INT src_height, INT src_stride, const PixelFormat fmt)
> {
> GpBitmap *dst_bitmap = (GpBitmap*)graphics->image;
> INT x, y;
> @@ -372,7 +372,10 @@ static GpStatus alpha_blend_bmp_pixels(GpGraphics *graphics, INT dst_x, INT dst_
> continue;
>
> GdipBitmapGetPixel(dst_bitmap, x+dst_x, y+dst_y, &dst_color);
> - GdipBitmapSetPixel(dst_bitmap, x+dst_x, y+dst_y, color_over(dst_color, src_color));
> + if (fmt & PixelFormatPAlpha)
> + GdipBitmapSetPixel(dst_bitmap, x+dst_x, y+dst_y, color_over_fgpremult(dst_color, src_color));
> + else
> + GdipBitmapSetPixel(dst_bitmap, x+dst_x, y+dst_y, color_over(dst_color, src_color));
> }
> }
>
> @@ -380,7 +383,7 @@ static GpStatus alpha_blend_bmp_pixels(GpGraphics *graphics, INT dst_x, INT dst_
> }
>
> static GpStatus alpha_blend_hdc_pixels(GpGraphics *graphics, INT dst_x, INT dst_y,
> - const BYTE *src, INT src_width, INT src_height, INT src_stride)
> + const BYTE *src, INT src_width, INT src_height, INT src_stride, PixelFormat fmt)
> {
> HDC hdc;
> HBITMAP hbitmap;
> @@ -404,7 +407,8 @@ static GpStatus alpha_blend_hdc_pixels(GpGraphics *graphics, INT dst_x, INT dst_
> hbitmap = CreateDIBSection(hdc, (BITMAPINFO*)&bih, DIB_RGB_COLORS,
> (void**)&temp_bits, NULL, 0);
>
> - if (GetDeviceCaps(graphics->hdc, SHADEBLENDCAPS) == SB_NONE)
> + if (GetDeviceCaps(graphics->hdc, SHADEBLENDCAPS) == SB_NONE ||
> + fmt & PixelFormatPAlpha)
> memcpy(temp_bits, src, src_width * src_height * 4);
> else
> convert_32bppARGB_to_32bppPARGB(src_width, src_height, temp_bits,
> @@ -420,7 +424,7 @@ static GpStatus alpha_blend_hdc_pixels(GpGraphics *graphics, INT dst_x, INT dst_
> }
>
> static GpStatus alpha_blend_pixels_hrgn(GpGraphics *graphics, INT dst_x, INT dst_y,
> - const BYTE *src, INT src_width, INT src_height, INT src_stride, HRGN hregion)
> + const BYTE *src, INT src_width, INT src_height, INT src_stride, HRGN hregion, PixelFormat fmt)
> {
> GpStatus stat=Ok;
>
> @@ -470,7 +474,7 @@ static GpStatus alpha_blend_pixels_hrgn(GpGraphics *graphics, INT dst_x, INT dst
> stat = alpha_blend_bmp_pixels(graphics, rects[i].left, rects[i].top,
> &src[(rects[i].left - dst_x) * 4 + (rects[i].top - dst_y) * src_stride],
> rects[i].right - rects[i].left, rects[i].bottom - rects[i].top,
> - src_stride);
> + src_stride, fmt);
> }
>
> GdipFree(rgndata);
> @@ -503,7 +507,7 @@ static GpStatus alpha_blend_pixels_hrgn(GpGraphics *graphics, INT dst_x, INT dst
> ExtSelectClipRgn(graphics->hdc, hregion, RGN_AND);
>
> stat = alpha_blend_hdc_pixels(graphics, dst_x, dst_y, src, src_width,
> - src_height, src_stride);
> + src_height, src_stride, fmt);
>
> RestoreDC(graphics->hdc, save);
>
> @@ -514,9 +518,9 @@ static GpStatus alpha_blend_pixels_hrgn(GpGraphics *graphics, INT dst_x, INT dst
> }
>
> 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)
> + const BYTE *src, INT src_width, INT src_height, INT src_stride, PixelFormat fmt)
> {
> - return alpha_blend_pixels_hrgn(graphics, dst_x, dst_y, src, src_width, src_height, src_stride, NULL);
> + return alpha_blend_pixels_hrgn(graphics, dst_x, dst_y, src, src_width, src_height, src_stride, NULL, fmt);
> }
>
> static ARGB blend_colors(ARGB start, ARGB end, REAL position)
> @@ -656,8 +660,9 @@ static BOOL color_is_gray(ARGB color)
> return (r == g) && (g == b);
> }
>
> -static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE data,
> - UINT width, UINT height, INT stride, ColorAdjustType type)
> +/* returns preferred pixel format for the applied attributes */
> +static PixelFormat apply_image_attributes(const GpImageAttributes *attributes, LPBYTE data,
> + UINT width, UINT height, INT stride, ColorAdjustType type, PixelFormat fmt)
> {
> UINT x, y;
> INT i;
> @@ -669,6 +674,9 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
> BYTE min_blue, min_green, min_red;
> BYTE max_blue, max_green, max_red;
>
> + if (!data || fmt != PixelFormat32bppARGB)
> + return PixelFormat32bppARGB;
> +
> if (attributes->colorkeys[type].enabled)
> key = &attributes->colorkeys[type];
> else
> @@ -702,6 +710,9 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
> {
> const struct color_remap_table *table;
>
> + if (!data || fmt != PixelFormat32bppARGB)
> + return PixelFormat32bppARGB;
> +
> if (attributes->colorremaptables[type].enabled)
> table = &attributes->colorremaptables[type];
> else
> @@ -731,6 +742,9 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
> int gray_matrix[5][5];
> BOOL identity;
>
> + if (!data || fmt != PixelFormat32bppARGB)
> + return PixelFormat32bppARGB;
> +
> if (attributes->colormatrices[type].enabled)
> colormatrices = &attributes->colormatrices[type];
> else
> @@ -769,6 +783,9 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
> {
> REAL gamma;
>
> + if (!data || fmt != PixelFormat32bppARGB)
> + return PixelFormat32bppARGB;
> +
> if (attributes->gamma_enabled[type])
> gamma = attributes->gamma[type];
> else
> @@ -793,6 +810,8 @@ static void apply_image_attributes(const GpImageAttributes *attributes, LPBYTE d
> *src_color = (*src_color & 0xff000000) | (red << 16) | (green << 8) | blue;
> }
> }
> +
> + return fmt;
> }
>
> /* Given a bitmap and its source rectangle, find the smallest rectangle in the
> @@ -1237,7 +1256,7 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
> if (stat == Ok)
> apply_image_attributes(fill->imageattributes, fill->bitmap_bits,
> bitmap->width, bitmap->height,
> - src_stride, ColorAdjustTypeBitmap);
> + src_stride, ColorAdjustTypeBitmap, lockeddata.PixelFormat);
>
> if (stat != Ok)
> {
> @@ -2990,15 +3009,18 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
> return OutOfMemory;
> src_stride = sizeof(ARGB) * src_area.Width;
>
> - /* Read the bits we need from the source bitmap into an ARGB buffer. */
> + /* Read the bits we need from the source bitmap into a compatible buffer. */
> lockeddata.Width = src_area.Width;
> lockeddata.Height = src_area.Height;
> lockeddata.Stride = src_stride;
> - lockeddata.PixelFormat = PixelFormat32bppARGB;
> lockeddata.Scan0 = src_data;
> + if (bitmap->format == PixelFormat32bppPARGB)
> + lockeddata.PixelFormat = apply_image_attributes(imageAttributes, NULL, 0, 0, 0, ColorAdjustTypeBitmap, bitmap->format);
> + else
> + lockeddata.PixelFormat = PixelFormat32bppARGB;
>
> stat = GdipBitmapLockBits(bitmap, &src_area, ImageLockModeRead|ImageLockModeUserInputBuf,
> - PixelFormat32bppARGB, &lockeddata);
> + lockeddata.PixelFormat, &lockeddata);
>
> if (stat == Ok)
> stat = GdipBitmapUnlockBits(bitmap, &lockeddata);
> @@ -3011,7 +3033,7 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
>
> apply_image_attributes(imageAttributes, src_data,
> src_area.Width, src_area.Height,
> - src_stride, ColorAdjustTypeBitmap);
> + src_stride, ColorAdjustTypeBitmap, lockeddata.PixelFormat);
>
> if (do_resampling)
> {
> @@ -3059,7 +3081,8 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image
> }
>
> stat = alpha_blend_pixels(graphics, dst_area.left, dst_area.top,
> - dst_data, dst_area.right - dst_area.left, dst_area.bottom - dst_area.top, dst_stride);
> + dst_data, dst_area.right - dst_area.left, dst_area.bottom - dst_area.top, dst_stride,
> + lockeddata.PixelFormat);
>
> GdipFree(src_data);
>
> @@ -4009,7 +4032,8 @@ static GpStatus SOFTWARE_GdipFillRegion(GpGraphics *graphics, GpBrush *brush,
> if (stat == Ok)
> stat = alpha_blend_pixels_hrgn(graphics, gp_bound_rect.X,
> gp_bound_rect.Y, (BYTE*)pixel_data, gp_bound_rect.Width,
> - gp_bound_rect.Height, gp_bound_rect.Width * 4, hregion);
> + gp_bound_rect.Height, gp_bound_rect.Width * 4, hregion,
> + PixelFormat32bppARGB);
>
> GdipFree(pixel_data);
> }
> @@ -5811,7 +5835,7 @@ GpStatus WINGDIPAPI GdipReleaseDC(GpGraphics *graphics, HDC hdc)
> /* Write the changed pixels to the real target. */
> alpha_blend_pixels(graphics, 0, 0, graphics->temp_bits,
> graphics->temp_hbitmap_width, graphics->temp_hbitmap_height,
> - graphics->temp_hbitmap_width * 4);
> + graphics->temp_hbitmap_width * 4, PixelFormat32bppARGB);
>
> /* Clean up. */
> DeleteDC(graphics->temp_hdc);
> @@ -6366,7 +6390,7 @@ static GpStatus SOFTWARE_GdipDrawDriverString(GpGraphics *graphics, GDIPCONST UI
>
> /* draw the result */
> stat = alpha_blend_pixels(graphics, min_x, min_y, pixel_data, pixel_area.Width,
> - pixel_area.Height, pixel_data_stride);
> + pixel_area.Height, pixel_data_stride, PixelFormat32bppARGB);
>
> GdipFree(pixel_data);
>
> --
> 2.3.5
>
>
>
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