Vincent Povirk : gdiplus: Support line gradient brushes in GdipFillPath.
Module: wine Branch: master Commit: 68dba4eff3cd3e696d964142637b0c03c496aa66 URL: http://source.winehq.org/git/wine.git/?a=commit;h=68dba4eff3cd3e696d96414263... Author: Vincent Povirk <vincent(a)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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Alexandre Julliard