From: Bartosz Kosiorek gang65@poczta.onet.pl
Using TransformMatrixPoints is not needed and all values could be taken from transformation matrix: - ShearX from m11, m12 - ShearY from m21, m22 - Translation mdx, mdy
The result could be calculated by taking destination points values: {{0.0, 0.0}, {1.0, 0.0}, {0.0, 1.0}}
and calculating it with GdipTransformMatrixPoints function: dst_to_src_points[0].X = dst_to_src.matrix[4]; dst_to_src_points[0].Y = dst_to_src.matrix[5]; dst_to_src_points[1].X = dst_to_src.matrix[0] + dst_to_src.matrix[4]; dst_to_src_points[1].Y = dst_to_src.matrix[1] + dst_to_src.matrix[5]; dst_to_src_points[2].X = dst_to_src.matrix[2] + dst_to_src.matrix[4]; dst_to_src_points[2].Y = dst_to_src.matrix[3] + dst_to_src.matrix[5]; --- dlls/gdiplus/graphics.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-)
diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c index 985a003f685..26faf4fbb4d 100644 --- a/dlls/gdiplus/graphics.c +++ b/dlls/gdiplus/graphics.c @@ -3234,13 +3234,12 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image { GpMatrix dst_to_src; REAL m11, m12, m21, m22, mdx, mdy; - GpPointF dst_to_src_points[3] = {{0.0, 0.0}, {1.0, 0.0}, {0.0, 1.0}}; REAL x_dx, x_dy, y_dx, y_dy; GpPointF src_pointf_row, src_pointf;
m11 = (ptf[1].X - ptf[0].X) / srcwidth; - m21 = (ptf[2].X - ptf[0].X) / srcheight; m12 = (ptf[1].Y - ptf[0].Y) / srcwidth; + m21 = (ptf[2].X - ptf[0].X) / srcheight; m22 = (ptf[2].Y - ptf[0].Y) / srcheight; mdx = ptf[0].X - m11 * srcx - m21 * srcy; mdy = ptf[0].Y - m12 * srcx - m22 * srcy; @@ -3259,19 +3258,16 @@ GpStatus WINGDIPAPI GdipDrawImagePointsRect(GpGraphics *graphics, GpImage *image }
dst_stride = sizeof(ARGB) * (dst_area.right - dst_area.left); - - GdipTransformMatrixPoints(&dst_to_src, dst_to_src_points, 3); - - x_dx = dst_to_src_points[1].X - dst_to_src_points[0].X; - x_dy = dst_to_src_points[1].Y - dst_to_src_points[0].Y; - y_dx = dst_to_src_points[2].X - dst_to_src_points[0].X; - y_dy = dst_to_src_points[2].Y - dst_to_src_points[0].Y; + x_dx = dst_to_src.matrix[0]; + x_dy = dst_to_src.matrix[1]; + y_dx = dst_to_src.matrix[2]; + y_dy = dst_to_src.matrix[3];
/* Calculate top left point of transformed image. It would be used as reference point for adding */ - src_pointf_row.X = dst_to_src_points[0].X + + src_pointf_row.X = dst_to_src.matrix[4] + dst_area.left * x_dx + dst_area.top * y_dx; - src_pointf_row.Y = dst_to_src_points[0].Y + + src_pointf_row.Y = dst_to_src.matrix[5] + dst_area.left * x_dy + dst_area.top * y_dy;
for (y = dst_area.top; y < dst_area.bottom;