void MyCanvas::shadeRect(const GRect& rect, GShader* shader)
{
assert(shader != nullptr);
if (rect.isEmpty())
{
printf("Error: ShadeRect rectangle is empty\n");
return;
}
/* Convert the rectangle into points, then CTM the resulting points */
auto Points = Utility::RectToPoints(rect);
CTMPoints(Points);
if ( !CTM.preservesRect()) //If the CTM does not preserve a rectangle, draw a polygon
{
auto Edges = pointsToEdges(Points);
shadeDevicePolygon(Edges, shader);
return;
}
//Convert the CTM'd points back into a rect since we know it preserves it
GIRect ConvertedRect = Utility::PointsToRect(Points).round();
// Make sure rect is not an empty one and clip the edges from the bitmap with intersect
if (ConvertedRect.isEmpty() || !ConvertedRect.intersect(BmpRect)) { return; }
shadeDeviceRect(ConvertedRect, shader);
}
virtual void fillRect(const GRect& rect, const GColor& color) {
GPixel c = color.premulToPixel();
if (0 == GPixel_GetA(c)) {
return;
}
GIRect ir = fIBounds;
if (ir.intersect(rect.round())) {
srcover_rect(fDevice, ir, c);
}
}
