[gtk/matthiasc/color-profiles] ngl: Linearize colors too

[Matthias Clasen <matthiasc src gnome org>]

commit 94b1f09cbb22abf8c579668308069da97ed0be9e
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Sep 29 23:27:57 2021 -0400

    ngl: Linearize colors too
    
    Convert all the GdkRGBA colors that we have
    in render nodes to linear sRGB before using
    them. This brings the rendering back in line
    with what cairo produces, except for the video.

 gsk/ngl/gsknglrenderjob.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)
---
diff --git a/gsk/ngl/gsknglrenderjob.c b/gsk/ngl/gsknglrenderjob.c
index 5a03e5f5b6..adecb988d2 100644
--- a/gsk/ngl/gsknglrenderjob.c
+++ b/gsk/ngl/gsknglrenderjob.c
@@ -30,6 +30,7 @@
 #include <gsk/gskglshaderprivate.h>
 #include <gdk/gdktextureprivate.h>
 #include <gdk/gdkcolorprofileprivate.h>
+#include <gdk/gdkmemoryformatprivate.h>
 #include <gsk/gsktransformprivate.h>
 #include <gsk/gskroundedrectprivate.h>
 #include <math.h>
@@ -929,7 +930,19 @@ static inline void
 rgba_to_half (const GdkRGBA *rgba,
               guint16        h[4])
 {
-  float_to_half4 ((const float *)rgba, h);
+  GdkRGBA d;
+  gdk_memory_convert ((guchar *) &d,
+                      sizeof (float) * 4,
+                      GDK_MEMORY_R32G32B32_FLOAT,
+                      gdk_color_profile_get_srgb_linear (),
+                      (guchar *) rgba,
+                      sizeof (float) * 4,
+                      GDK_MEMORY_R32G32B32_FLOAT,
+                      gdk_color_profile_get_srgb (),
+                      1,
+                      1);
+  d.alpha = rgba->alpha;
+  float_to_half4 ((const float *)&d, h);
 }
 
 /* fill_vertex_data */
@@ -3997,16 +4010,15 @@ static void
 gsk_ngl_render_job_postprocess (GskNglRenderJob *job,
                                 guint            texture_id)
 {
-  GskNglProgram *program = job->driver->postprocessing_no_clip;
-
   gsk_ngl_command_queue_bind_framebuffer (job->command_queue, job->framebuffer);
+  gsk_ngl_command_queue_clear (job->command_queue, 0, &job->viewport);
 
-  gsk_ngl_render_job_begin_draw (job, program);
+  gsk_ngl_render_job_begin_draw (job, CHOOSE_PROGRAM (job, postprocessing));
   gsk_ngl_program_set_uniform_texture (job->current_program,
                                        UNIFORM_SHARED_SOURCE, 0,
                                        GL_TEXTURE_2D, GL_TEXTURE0, texture_id);
   gsk_ngl_uniform_state_set1f (job->command_queue->uniforms,
-                               program->program_info,
+                               job->current_program->program_info,
                                UNIFORM_GAMMA, 0,
                                2.2);
   gsk_ngl_render_job_draw_offscreen_rect (job, &job->viewport);