tdf#163152 don't convert image's sRGB colorspace

With Skia/Raster or Skia disabled, converting the image's
colorspace to match the window's colorspace causes more than
an expected amount of color saturation so let the window's
underlying CGContext handle any necessary colorspace conversion
in CGContextDrawImage().

With Skia/Metal, this bug is caused by the CAMetalLayer being
set to the same colorspace as its matching window. So set the
CAMetalLayer's colorspace to sRGB so that, like with Skia/Raster
and Skia disabled, any colorspace conversion is handled when the
CAMetalLayer is drawn to the window.

Change-Id: Ifa2abe46d34bfcf5acd478fffd346603f869157b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173962
Tested-by: Jenkins
Reviewed-by: Patrick Luby <guibomacdev@gmail.com>
(cherry picked from commit e4ab68142c7bc4e04ffe429567dda974b86985a7)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173923
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

2 files changed, 41 insertions, 31 deletions

diff --git a/external/skia/UnpackedTarball_skia.mk b/external/skia/UnpackedTarball_skia.mk
index b985d8aa9744..bbc51141cda6 100644
--- a/external/skia/UnpackedTarball_skia.mk
+++ b/external/skia/UnpackedTarball_skia.mk
@@ -33,7 +33,7 @@ skia_patches := \
     windows-libraries-system32.patch.1 \
     allow-no-es2restrictions.patch.1 \
     vk_mem_alloc.patch.1 \
-    tdf147342.patch.0 \
+    macosmetal.patch.0 \
     redefinition-of-op.patch.0 \
     0001-Added-missing-include-cstdio.patch \
     fix-SkDebugf-link-error.patch.1 \
diff --git a/external/skia/tdf147342.patch.0 b/external/skia/macosmetal.patch.0
index 3b50038c07ac..3da9fc693fe9 100644
--- a/external/skia/tdf147342.patch.0
+++ b/external/skia/macosmetal.patch.0
@@ -18,36 +18,6 @@
  
  namespace window_context_factory {
  
---- tools/sk_app/mac/MetalWindowContext_mac.mm	2021-11-25 10:39:27.000000000 -0500
-+++ tools/sk_app/mac/MetalWindowContext_mac.mm	2023-01-28 14:55:57.000000000 -0500
-@@ -11,6 +11,8 @@
- #import <Cocoa/Cocoa.h>
- #import <QuartzCore/CAConstraintLayoutManager.h>
- 
-+#include <sal/log.hxx>
-+
- using sk_app::DisplayParams;
- using sk_app::window_context_factory::MacWindowInfo;
- using sk_app::MetalWindowContext;
-@@ -87,6 +89,18 @@
-     fMetalLayer.drawableSize = backingSize;
-     fMetalLayer.contentsScale = backingScaleFactor;
- 
-+    // Related: tdf#147342 Copy layer's colorspace to window's colorspace
-+    // This method is now called when the window's backing properties have
-+    // changed so copy any colorspace changes.
-+    NSColorSpace* cs = fMainView.window.colorSpace;
-+    fMetalLayer.colorspace = cs.CGColorSpace;
-+    // Related tdf#145988 Reset layer's pixel format to MTLPixelFormatBGRA8Unorm
-+    // Skia initally sets the layer's pixel format to be BGRA8888 but macOS
-+    // may change the layer's pixel format when a window has moved to a screen
-+    // with 30-bit color depth so reset it back to BGRA8888.
-+    SAL_WARN_IF(fMetalLayer.pixelFormat != MTLPixelFormatBGRA8Unorm, "vcl.skia.metal", "CAMetalLayer pixel format is " << fMetalLayer.pixelFormat << " but should be " << MTLPixelFormatBGRA8Unorm << " (MTLPixelFormatBGRA8Unorm)");
-+    fMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
-+
-     fWidth = backingSize.width;
-     fHeight = backingSize.height;
- }
 --- /dev/null	2023-01-25 09:20:55.000000000 -0500
 +++ tools/sk_app/mac/WindowContextFactory_mac.mm	2023-01-25 09:21:22.000000000 -0500
 @@ -0,0 +1,57 @@
@@ -108,3 +78,43 @@
 +}
 +
 +}  // namespace sk_app
+--- tools/sk_app/mac/MetalWindowContext_mac.mm	2024-08-31 15:49:57
++++ tools/sk_app/mac/MetalWindowContext_mac.mm	2024-09-25 20:09:32
+@@ -11,6 +11,8 @@
+ #import <Cocoa/Cocoa.h>
+ #import <QuartzCore/CAConstraintLayoutManager.h>
+ 
++#include <sal/log.hxx>
++
+ using sk_app::DisplayParams;
+ using sk_app::window_context_factory::MacWindowInfo;
+ using sk_app::MetalWindowContext;
+@@ -66,8 +68,7 @@
+     fMetalLayer.autoresizingMask = kCALayerHeightSizable | kCALayerWidthSizable;
+     fMetalLayer.contentsGravity = kCAGravityTopLeft;
+     fMetalLayer.magnificationFilter = kCAFilterNearest;
+-    NSColorSpace* cs = fMainView.window.colorSpace;
+-    fMetalLayer.colorspace = cs.CGColorSpace;
++    fMetalLayer.colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
+ 
+     fMainView.layer = fMetalLayer;
+     fMainView.wantsLayer = YES;
+@@ -86,6 +87,18 @@
+     fMetalLayer.drawableSize = backingSize;
+     fMetalLayer.contentsScale = backingScaleFactor;
+ 
++    // Related: tdf#147342 Copy layer's colorspace to window's colorspace
++    // This method is now called when the window's backing properties have
++    // changed so copy any colorspace changes.
++    fMetalLayer.colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
++
++    // Related tdf#145988 Reset layer's pixel format to MTLPixelFormatBGRA8Unorm
++    // Skia initally sets the layer's pixel format to be BGRA8888 but macOS
++    // may change the layer's pixel format when a window has moved to a screen
++    // with 30-bit color depth so reset it back to BGRA8888.
++    SAL_WARN_IF(fMetalLayer.pixelFormat != MTLPixelFormatBGRA8Unorm, "vcl.skia.metal", "CAMetalLayer pixel format is " << fMetalLayer.pixelFormat << " but should be " << MTLPixelFormatBGRA8Unorm << " (MTLPixelFormatBGRA8Unorm)");
++    fMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
++
+     fWidth = backingSize.width;
+     fHeight = backingSize.height;
+ }