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gdiplus: Do some actual color blending when drawing path gradients.

This commit is contained in:
Vincent Povirk 2012-02-22 15:10:04 -06:00 committed by Alexandre Julliard
parent 703b31b2e8
commit 5ed5daf4da
1 changed files with 17 additions and 1 deletions
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18
dlls/gdiplus/graphics.c
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@ -1191,6 +1191,7 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
REAL min_yf, max_yf, line1_xf, line2_xf; REAL min_yf, max_yf, line1_xf, line2_xf;
INT min_y, max_y, min_x, max_x; INT min_y, max_y, min_x, max_x;
INT x, y; INT x, y;
ARGB outer_color=0xffffffff;
stat = GdipClonePath(fill->path, &flat_path); stat = GdipClonePath(fill->path, &flat_path);
@ -1225,6 +1226,7 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
{ {
int start_center_line=0, end_center_line=0; int start_center_line=0, end_center_line=0;
int seen_start=0, seen_end=0, seen_center=0; int seen_start=0, seen_end=0, seen_center=0;
REAL center_distance;
type = flat_path->pathdata.Types[i]; type = flat_path->pathdata.Types[i];
@ -1258,6 +1260,10 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
else else
max_y = (INT)ceil(max_yf); max_y = (INT)ceil(max_yf);
/* This is proportional to the distance from start-end line to center point. */
center_distance = (end_point.Y - start_point.Y) * (start_point.X - center_point.X) +
(end_point.X - start_point.X) * (center_point.Y - start_point.Y);
for (y=min_y; y<max_y; y++) for (y=min_y; y<max_y; y++)
{ {
REAL yf = (REAL)y; REAL yf = (REAL)y;
@ -1306,7 +1312,17 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
max_x = fill_area->X + fill_area->Width; max_x = fill_area->X + fill_area->Width;
for (x=min_x; x<max_x; x++) for (x=min_x; x<max_x; x++)
argb_pixels[(x-fill_area->X) + (y-fill_area->Y)*cdwStride] = fill->centercolor; {
REAL distance;
distance = (end_point.Y - start_point.Y) * (start_point.X - (REAL)x) +
(end_point.X - start_point.X) * (yf - start_point.Y);
distance = distance / center_distance;
argb_pixels[(x-fill_area->X) + (y-fill_area->Y)*cdwStride] =
blend_colors(outer_color, fill->centercolor, distance);
}
} }
} }