Vincent Povirk : gdiplus: Support line gradient brushes in GdipFillPath.
Alexandre Julliard
julliard at winehq.org
Tue Mar 24 09:02:01 CDT 2009
Module: wine
Branch: master
Commit: 68dba4eff3cd3e696d964142637b0c03c496aa66
URL: http://source.winehq.org/git/wine.git/?a=commit;h=68dba4eff3cd3e696d964142637b0c03c496aa66
Author: Vincent Povirk <vincent at codeweavers.com>
Date: Mon Mar 16 12:51:04 2009 -0500
gdiplus: Support line gradient brushes in GdipFillPath.
---
dlls/gdiplus/graphics.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 159 insertions(+), 2 deletions(-)
diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index 9df9e21..5d1cbd6 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -172,6 +172,164 @@ static void transform_and_round_points(GpGraphics *graphics, POINT *pti,
}
}
+static ARGB blend_colors(ARGB start, ARGB end, int current, int total)
+{
+ ARGB result=0;
+ ARGB i;
+ for (i=0xff; i<=0xff0000; i = i << 8)
+ result |= (((start&i)*(total - current)+(end&i)*(current))/total)&i;
+ return result;
+}
+
+static void brush_fill_path(GpGraphics *graphics, GpBrush* brush)
+{
+ switch (brush->bt)
+ {
+ case BrushTypeLinearGradient:
+ {
+ GpLineGradient *line = (GpLineGradient*)brush;
+ RECT rc;
+ int num_steps = 255;
+
+ SelectClipPath(graphics->hdc, RGN_AND);
+ if (GetClipBox(graphics->hdc, &rc) != NULLREGION)
+ {
+ GpPointF endpointsf[2];
+ POINT endpointsi[2];
+ POINT poly[4];
+
+ SelectObject(graphics->hdc, GetStockObject(NULL_PEN));
+
+ /* fill with starting color */
+ FillRect(graphics->hdc, &rc, brush->gdibrush);
+
+ endpointsf[0] = line->startpoint;
+ endpointsf[1] = line->endpoint;
+ transform_and_round_points(graphics, endpointsi, endpointsf, 2);
+
+ if (abs(endpointsi[0].x-endpointsi[1].x) > abs(endpointsi[0].y-endpointsi[1].y))
+ {
+ /* vertical-ish gradient */
+ int endborderx; /* vertical rectangle boundary near endpoint */
+ int startx, endx; /* x co-ordinates of endpoints shifted to intersect the top of the visible rectangle */
+ int startbottomx, endbottomx; /* x co-ordinate of endpoints shifted to intersect the bottom of the visible rectangle */
+ int width;
+ COLORREF col;
+ HBRUSH hbrush, hprevbrush;
+ int i;
+
+ if (endpointsi[1].x > endpointsi[0].x)
+ endborderx = rc.right;
+ else
+ endborderx = rc.left;
+
+ startx = roundr((rc.top - endpointsf[0].Y) * (endpointsf[1].Y - endpointsf[0].Y) / (endpointsf[0].X - endpointsf[1].X) + endpointsf[0].X);
+ endx = roundr((rc.top - endpointsf[1].Y) * (endpointsf[1].Y - endpointsf[0].Y) / (endpointsf[0].X - endpointsf[1].X) + endpointsf[1].X);
+ width = endx - startx;
+ startbottomx = roundr((rc.bottom - endpointsf[0].Y) * (endpointsf[1].Y - endpointsf[0].Y) / (endpointsf[0].X - endpointsf[1].X) + endpointsf[0].X);
+ endbottomx = startbottomx+width;
+
+ if (num_steps > abs(width)) num_steps = abs(width);
+
+ poly[0].x = endborderx;
+ poly[0].y = rc.bottom;
+ poly[1].x = endborderx;
+ poly[1].y = rc.top;
+ poly[2].y = rc.top;
+ poly[3].y = rc.bottom;
+
+ for (i=1; i<num_steps; i++)
+ {
+ ARGB argb = blend_colors(line->startcolor, line->endcolor, i, num_steps);
+ int ofs = width * i / num_steps;
+ col = ARGB2COLORREF(argb);
+ hbrush = CreateSolidBrush(col);
+ hprevbrush = SelectObject(graphics->hdc, hbrush);
+ poly[2].x = startx + ofs;
+ poly[3].x = startbottomx + ofs;
+ Polygon(graphics->hdc, poly, 4);
+ SelectObject(graphics->hdc, hprevbrush);
+ DeleteObject(hbrush);
+ }
+
+ poly[2].x = endx;
+ poly[3].x = endbottomx;
+
+ /* draw the ending color */
+ col = ARGB2COLORREF(line->endcolor);
+ hbrush = CreateSolidBrush(col);
+ hprevbrush = SelectObject(graphics->hdc, hbrush);
+ Polygon(graphics->hdc, poly, 4);
+ SelectObject(graphics->hdc, hprevbrush);
+ DeleteObject(hbrush);
+ }
+ else if (endpointsi[0].y != endpointsi[1].y)
+ {
+ /* horizontal-ish gradient */
+ int endbordery; /* horizontal rectangle boundary near endpoint */
+ int starty, endy; /* y co-ordinates of endpoints shifted to intersect the left of the visible rectangle */
+ int startrighty, endrighty; /* y co-ordinate of endpoints shifted to intersect the right of the visible rectangle */
+ int height;
+ COLORREF col;
+ HBRUSH hbrush, hprevbrush;
+ int i;
+
+ if (endpointsi[1].y > endpointsi[0].y)
+ endbordery = rc.bottom;
+ else
+ endbordery = rc.top;
+
+ starty = roundr((rc.left - endpointsf[0].X) * (endpointsf[0].X - endpointsf[1].X) / (endpointsf[1].Y - endpointsf[0].Y) + endpointsf[0].Y);
+ endy = roundr((rc.left - endpointsf[1].X) * (endpointsf[0].X - endpointsf[1].X) / (endpointsf[1].Y - endpointsf[0].Y) + endpointsf[1].Y);
+ height = endy - starty;
+ startrighty = roundr((rc.right - endpointsf[0].X) * (endpointsf[0].X - endpointsf[1].X) / (endpointsf[1].Y - endpointsf[0].Y) + endpointsf[0].Y);
+ endrighty = startrighty+height;
+
+ if (num_steps > abs(height)) num_steps = abs(height);
+
+ poly[0].x = rc.right;
+ poly[0].y = endbordery;
+ poly[1].x = rc.left;
+ poly[1].y = endbordery;
+ poly[2].x = rc.left;
+ poly[3].x = rc.right;
+
+ for (i=1; i<num_steps; i++)
+ {
+ ARGB argb = blend_colors(line->startcolor, line->endcolor, i, num_steps);
+ int ofs = height * i / num_steps;
+ col = ARGB2COLORREF(argb);
+ hbrush = CreateSolidBrush(col);
+ hprevbrush = SelectObject(graphics->hdc, hbrush);
+ poly[2].y = starty + ofs;
+ poly[3].y = startrighty + ofs;
+ Polygon(graphics->hdc, poly, 4);
+ SelectObject(graphics->hdc, hprevbrush);
+ DeleteObject(hbrush);
+ }
+
+ poly[2].y = endy;
+ poly[3].y = endrighty;
+
+ /* draw the ending color */
+ col = ARGB2COLORREF(line->endcolor);
+ hbrush = CreateSolidBrush(col);
+ hprevbrush = SelectObject(graphics->hdc, hbrush);
+ Polygon(graphics->hdc, poly, 4);
+ SelectObject(graphics->hdc, hprevbrush);
+ DeleteObject(hbrush);
+ }
+ /* else startpoint == endpoint */
+ }
+ break;
+ }
+ default:
+ SelectObject(graphics->hdc, brush->gdibrush);
+ FillPath(graphics->hdc);
+ break;
+ }
+}
+
/* GdipDrawPie/GdipFillPie helper function */
static void draw_pie(GpGraphics *graphics, REAL x, REAL y, REAL width,
REAL height, REAL startAngle, REAL sweepAngle)
@@ -2086,7 +2244,6 @@ GpStatus WINGDIPAPI GdipFillPath(GpGraphics *graphics, GpBrush *brush, GpPath *p
save_state = SaveDC(graphics->hdc);
EndPath(graphics->hdc);
- SelectObject(graphics->hdc, brush->gdibrush);
SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
: WINDING));
@@ -2098,7 +2255,7 @@ GpStatus WINGDIPAPI GdipFillPath(GpGraphics *graphics, GpBrush *brush, GpPath *p
goto end;
EndPath(graphics->hdc);
- FillPath(graphics->hdc);
+ brush_fill_path(graphics, brush);
retval = Ok;
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