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gdiplus: Fill path gradients with a solid color.

This commit is contained in:
Vincent Povirk 2012-02-20 17:08:05 -06:00 committed by Alexandre Julliard
parent 7b918934e6
commit 703b31b2e8
1 changed files with 140 additions and 0 deletions
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140
dlls/gdiplus/graphics.c
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@ -875,6 +875,11 @@ static ARGB resample_bitmap_pixel(GDIPCONST GpRect *src_rect, LPBYTE bits, UINT
}
}
static REAL intersect_line_scanline(const GpPointF *p1, const GpPointF *p2, REAL y)
{
return (p1->X - p2->X) * (p2->Y - y) / (p2->Y - p1->Y) + p2->X;
}
static INT brush_can_fill_path(GpBrush *brush)
{
switch (brush->bt)
@ -958,6 +963,7 @@ static INT brush_can_fill_pixels(GpBrush *brush)
case BrushTypeHatchFill:
case BrushTypeLinearGradient:
case BrushTypeTextureFill:
case BrushTypePathGradient:
return 1;
default:
return 0;
@ -1173,6 +1179,140 @@ static GpStatus brush_fill_pixels(GpGraphics *graphics, GpBrush *brush,
return stat;
}
case BrushTypePathGradient:
{
GpPathGradient *fill = (GpPathGradient*)brush;
GpPath *flat_path;
GpMatrix *world_to_device;
GpStatus stat;
int i, figure_start=0;
GpPointF start_point, end_point, center_point;
BYTE type;
REAL min_yf, max_yf, line1_xf, line2_xf;
INT min_y, max_y, min_x, max_x;
INT x, y;
stat = GdipClonePath(fill->path, &flat_path);
if (stat != Ok)
return stat;
stat = get_graphics_transform(graphics, CoordinateSpaceDevice,
CoordinateSpaceWorld, &world_to_device);
if (stat == Ok)
{
stat = GdipTransformPath(flat_path, world_to_device);
if (stat == Ok)
{
center_point = fill->center;
stat = GdipTransformMatrixPoints(world_to_device, &center_point, 1);
}
if (stat == Ok)
stat = GdipFlattenPath(flat_path, NULL, 0.5);
GdipDeleteMatrix(world_to_device);
}
if (stat != Ok)
{
GdipDeletePath(flat_path);
return stat;
}
for (i=0; i<flat_path->pathdata.Count; i++)
{
int start_center_line=0, end_center_line=0;
int seen_start=0, seen_end=0, seen_center=0;
type = flat_path->pathdata.Types[i];
if ((type&PathPointTypePathTypeMask) == PathPointTypeStart)
figure_start = i;
start_point = flat_path->pathdata.Points[i];
if ((type&PathPointTypeCloseSubpath) == PathPointTypeCloseSubpath || i+1 >= flat_path->pathdata.Count)
end_point = flat_path->pathdata.Points[figure_start];
else if ((flat_path->pathdata.Types[i+1] & PathPointTypePathTypeMask) == PathPointTypeLine)
end_point = flat_path->pathdata.Points[i+1];
else
continue;
min_yf = center_point.Y;
if (min_yf > start_point.Y) min_yf = start_point.Y;
if (min_yf > end_point.Y) min_yf = end_point.Y;
if (min_yf < fill_area->Y)
min_y = fill_area->Y;
else
min_y = (INT)ceil(min_yf);
max_yf = center_point.Y;
if (max_yf < start_point.Y) max_yf = start_point.Y;
if (max_yf < end_point.Y) max_yf = end_point.Y;
if (max_yf > fill_area->Y + fill_area->Height)
max_y = fill_area->Y + fill_area->Height;
else
max_y = (INT)ceil(max_yf);
for (y=min_y; y<max_y; y++)
{
REAL yf = (REAL)y;
if (!seen_start && yf >= start_point.Y)
{
seen_start = 1;
start_center_line ^= 1;
}
if (!seen_end && yf >= end_point.Y)
{
seen_end = 1;
end_center_line ^= 1;
}
if (!seen_center && yf >= center_point.Y)
{
seen_center = 1;
start_center_line ^= 1;
end_center_line ^= 1;
}
if (start_center_line)
line1_xf = intersect_line_scanline(&start_point, &center_point, yf);
else
line1_xf = intersect_line_scanline(&start_point, &end_point, yf);
if (end_center_line)
line2_xf = intersect_line_scanline(&end_point, &center_point, yf);
else
line2_xf = intersect_line_scanline(&start_point, &end_point, yf);
if (line1_xf < line2_xf)
{
min_x = (INT)ceil(line1_xf);
max_x = (INT)ceil(line2_xf);
}
else
{
min_x = (INT)ceil(line2_xf);
max_x = (INT)ceil(line1_xf);
}
if (min_x < fill_area->X)
min_x = fill_area->X;
if (max_x > fill_area->X + fill_area->Width)
max_x = fill_area->X + fill_area->Width;
for (x=min_x; x<max_x; x++)
argb_pixels[(x-fill_area->X) + (y-fill_area->Y)*cdwStride] = fill->centercolor;
}
}
GdipDeletePath(flat_path);
return stat;
}
default:
return NotImplemented;
}