[PATCH v2 0/1] MR2847: gdiplus: Improve performance of gdip_transform_points.

[Bartosz Kosiorek (＠gang65)]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53947

--
  v2: gdiplus: Improve performance of gdip_transform_points.

https://gitlab.winehq.org/wine/wine/-/merge_requests/2847

[PATCH v2 1/1] gdiplus: Improve performance of gdip_transform_points.

[Bartosz Kosiorek]

From: Bartosz Kosiorek

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53947
---
 dlls/gdiplus/graphics.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index fca66c8654b..6831cfcb247 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -6887,13 +6887,15 @@ GpStatus get_graphics_transform(GpGraphics *graphics, GpCoordinateSpace dst_spac

if (dst_space != src_space)
     {
-        scale_x = units_to_pixels(1.0, graphics->unit, graphics->xres, graphics->printer_display);
-        scale_y = units_to_pixels(1.0, graphics->unit, graphics->yres, graphics->printer_display);
-
         if(graphics->unit != UnitDisplay)
         {
-            scale_x *= graphics->scale;
-            scale_y *= graphics->scale;
+            scale_x = units_to_pixels(graphics->scale, graphics->unit, graphics->xres, graphics->printer_display);
+            scale_y = units_to_pixels(graphics->scale, graphics->unit, graphics->yres, graphics->printer_display);
+        }
+        else
+        {
+            scale_x = units_to_pixels(1.0, graphics->unit, graphics->xres, graphics->printer_display);
+            scale_y = units_to_pixels(1.0, graphics->unit, graphics->yres, graphics->printer_display);
         }

if (dst_space < src_space)
@@ -6903,12 +6905,11 @@ GpStatus get_graphics_transform(GpGraphics *graphics, GpCoordinateSpace dst_spac
             {
             case WineCoordinateSpaceGdiDevice:
             {
-                GpMatrix gdixform;
-                gdixform = graphics->gdi_transform;
+                GpMatrix gdixform = graphics->gdi_transform;
                 stat = GdipInvertMatrix(&gdixform);
                 if (stat != Ok)
                     break;
-                GdipMultiplyMatrix(matrix, &gdixform, MatrixOrderAppend);
+                memcpy(matrix->matrix, gdixform.matrix, sizeof(matrix->matrix));
                 if (dst_space == CoordinateSpaceDevice)
                     break;
                 /* else fall-through */
@@ -6934,7 +6935,7 @@ GpStatus get_graphics_transform(GpGraphics *graphics, GpCoordinateSpace dst_spac
             switch ((int)src_space)
             {
             case CoordinateSpaceWorld:
-                GdipMultiplyMatrix(matrix, &graphics->worldtrans, MatrixOrderAppend);
+                memcpy(matrix->matrix, &graphics->worldtrans, sizeof(matrix->matrix));
                 if (dst_space == CoordinateSpacePage)
                     break;
                 /* else fall-through */

[Bartosz Kosiorek (＠gang65)]

On Wed May 17 20:12:41 2023 +0000, Bartosz Kosiorek wrote:
> changed this line in [version 2 of the diff](/wine/wine/-/merge_requests/2847/diffs?diff_id=47433&start_sha=bc552d6c21ad2199621aadf692e098ce918d543c#aaf93e29527c1cbc47ec54679da5828ebd679128_6958_6958)

I have removed inline

[PATCH v2 0/1] MR2847: gdiplus: Improve performance of gdip_transform_points. - approved

[Torge Matthies (＠tmatthies)]

This merge request was approved by Torge Matthies.

[Torge Matthies (＠tmatthies)]

This gets my approval but ultimately Esme's approval (or lack thereof) is what counts (see MAINTAINERS file)

[PATCH v2 0/1] MR2847: gdiplus: Improve performance of gdip_transform_points. - approved

[Esme Povirk (＠madewokherd)]

This merge request was approved by Esme Povirk.

[Esme Povirk (＠madewokherd)]

If this function is called often enough that the performance matters so much, maybe it'd be worth caching some of these transform matrices (perhaps world<->device and world<->gdidevice). Most of the calls probably have the exact same inputs and result, and we know exactly when those inputs change.