Vincent Povirk : gdiplus: Properly draw points outside of line gradients.
Module: wine Branch: master Commit: 966fd5ec092a3745fe8d2d371e24d4b3161dd0b8 URL: http://source.winehq.org/git/wine.git/?a=commit;h=966fd5ec092a3745fe8d2d371e... Author: Vincent Povirk <vincent(a)codeweavers.com> Date: Fri May 1 15:23:02 2009 -0500 gdiplus: Properly draw points outside of line gradients. Theoretically, a line gradient covers the area enclosed by the starting and ending gradient lines, which intersect the start and end points respectively and are perpendicular to a line joining the start and end points. --- dlls/gdiplus/graphics.c | 115 ++++++++++++++++++++++------------------------ 1 files changed, 55 insertions(+), 60 deletions(-) diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c index b467dc7..219ed75 100644 --- a/dlls/gdiplus/graphics.c +++ b/dlls/gdiplus/graphics.c @@ -185,6 +185,19 @@ static ARGB blend_line_gradient(GpLineGradient* brush, REAL position) { REAL blendfac; + /* clamp to between 0.0 and 1.0, using the wrap mode */ + if (brush->wrap == WrapModeTile) + { + position = fmodf(position, 1.0f); + if (position < 0.0f) position += 1.0f; + } + else /* WrapModeFlip* */ + { + position = fmodf(position, 2.0f); + if (position < 0.0f) position += 2.0f; + if (position > 1.0f) position = 2.0f - position; + } + if (brush->blendcount == 1) blendfac = position; else @@ -217,7 +230,6 @@ static void brush_fill_path(GpGraphics *graphics, GpBrush* brush) { GpLineGradient *line = (GpLineGradient*)brush; RECT rc; - int num_steps = 255; SelectClipPath(graphics->hdc, RGN_AND); if (GetClipBox(graphics->hdc, &rc) != NULLREGION) @@ -228,9 +240,6 @@ static void brush_fill_path(GpGraphics *graphics, GpBrush* brush) 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); @@ -238,114 +247,100 @@ static void brush_fill_path(GpGraphics *graphics, GpBrush* brush) 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 startbottomx; /* x co-ordinate of start point 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; + int leftx, rightx; /* x co-ordinates where the leftmost and rightmost gradient lines hit the top of the visible rectangle */ + int x; + int tilt; /* horizontal distance covered by a gradient line */ 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; + tilt = startx - startbottomx; - if (num_steps > abs(width)) num_steps = abs(width); + if (startx >= startbottomx) + { + leftx = rc.left; + rightx = rc.right + tilt; + } + else + { + leftx = rc.left + tilt; + rightx = rc.right; + } - poly[0].x = endborderx; + poly[0].x = rc.right; poly[0].y = rc.bottom; - poly[1].x = endborderx; + poly[1].x = rc.right; poly[1].y = rc.top; poly[2].y = rc.top; poly[3].y = rc.bottom; - for (i=1; i<num_steps; i++) + for (x=leftx; x<=rightx; x++) { - ARGB argb = blend_line_gradient(line, i/(REAL)num_steps); - int ofs = width * i / num_steps; + ARGB argb = blend_line_gradient(line, (x-startx)/(REAL)width); col = ARGB2COLORREF(argb); hbrush = CreateSolidBrush(col); hprevbrush = SelectObject(graphics->hdc, hbrush); - poly[2].x = startx + ofs; - poly[3].x = startbottomx + ofs; + poly[2].x = x; + poly[3].x = x - tilt; 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 startrighty; /* y co-ordinate of start point 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; + int topy, bottomy; /* y co-ordinates where the topmost and bottommost gradient lines hit the left of the visible rectangle */ + int y; + int tilt; /* vertical distance covered by a gradient line */ 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; + tilt = starty - startrighty; - if (num_steps > abs(height)) num_steps = abs(height); + if (starty >= startrighty) + { + topy = rc.top; + bottomy = rc.bottom + tilt; + } + else + { + topy = rc.top + tilt; + bottomy = rc.bottom; + } poly[0].x = rc.right; - poly[0].y = endbordery; + poly[0].y = rc.bottom; poly[1].x = rc.left; - poly[1].y = endbordery; + poly[1].y = rc.bottom; poly[2].x = rc.left; poly[3].x = rc.right; - for (i=1; i<num_steps; i++) + for (y=topy; y<=bottomy; y++) { - ARGB argb = blend_line_gradient(line, i/(REAL)num_steps); - int ofs = height * i / num_steps; + ARGB argb = blend_line_gradient(line, (y-starty)/(REAL)height); col = ARGB2COLORREF(argb); hbrush = CreateSolidBrush(col); hprevbrush = SelectObject(graphics->hdc, hbrush); - poly[2].y = starty + ofs; - poly[3].y = startrighty + ofs; + poly[2].y = y; + poly[3].y = y - tilt; 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 */ }
participants (1)
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Alexandre Julliard