gl-renderer: color transform censor fill and triangle fan

Use the sRGB to blending color space transformation for the censoring
color fill and triangle fan debug drawings.

This removes the assert that the output's blending space is (non-linear)
sRGB.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/renderer-gl/gl-renderer.c

@@ -718,6 +718,7 @@ gl_renderer_send_shader_error(struct weston_view *view)
 static void
 triangle_fan_debug(struct gl_renderer *gr,
 		   const struct gl_shader_config *sconf,
+		   struct weston_output *output,
 		   int first, int count)
 {
 	int i;
@@ -739,13 +740,19 @@ triangle_fan_debug(struct gl_renderer *gr,
 		.req = {
 			.variant = SHADER_VARIANT_SOLID,
 			.input_is_premult = true,
-			.color_pre_curve = SHADER_COLOR_CURVE_IDENTITY,
 		},
 		.projection = sconf->projection,
 		.view_alpha = 1.0f,
 		.unicolor = { col[0], col[1], col[2], col[3] },
 	};
 
+	if (!gl_shader_config_set_color_transform(&alt,
+						  output->from_sRGB_to_blend)) {
+		weston_log("GL-renderer: %s failed to generate a color transformation.\n",
+			   __func__);
+		return;
+	}
+
 	gl_renderer_use_program(gr, &alt);
 
 	nelems = (count - 1 + count - 2) * 2;
@@ -773,6 +780,7 @@ triangle_fan_debug(struct gl_renderer *gr,
 static void
 repaint_region(struct gl_renderer *gr,
 	       struct weston_view *ev,
+	       struct weston_output *output,
 	       pixman_region32_t *region,
 	       pixman_region32_t *surf_region,
 	       const struct gl_shader_config *sconf)
@@ -810,7 +818,7 @@ repaint_region(struct gl_renderer *gr,
 	for (i = 0, first = 0; i < nfans; i++) {
 		glDrawArrays(GL_TRIANGLE_FAN, first, vtxcnt[i]);
 		if (gr->fan_debug)
-			triangle_fan_debug(gr, sconf, first, vtxcnt[i]);
+			triangle_fan_debug(gr, sconf, output, first, vtxcnt[i]);
 		first += vtxcnt[i];
 	}
 
@@ -910,6 +918,28 @@ ensure_surface_buffer_is_ready(struct gl_renderer *gr,
 	return (wait_ret == EGL_TRUE && destroy_ret == EGL_TRUE) ? 0 : -1;
 }
 
+static void
+censor_override(struct gl_shader_config *sconf,
+		struct weston_output *output)
+{
+	struct gl_shader_config alt = {
+		.req = {
+			.variant = SHADER_VARIANT_SOLID,
+			.input_is_premult = true,
+		},
+		.projection = sconf->projection,
+		.view_alpha = sconf->view_alpha,
+		.unicolor = { 0.40, 0.0, 0.0, 1.0 },
+	};
+
+	if (!gl_shader_config_set_color_transform(&alt,
+						  output->from_sRGB_to_blend)) {
+		weston_log("GL-renderer: %s failed to generate a color transformation.\n",
+			   __func__);
+	}
+
+	*sconf = alt;
+}
 
  /* Checks if a view needs to be censored on an output
   * Checks for 2 types of censor requirements
@@ -924,16 +954,6 @@ maybe_censor_override(struct gl_shader_config *sconf,
 		      struct weston_output *output,
 		      struct weston_view *ev)
 {
-	const struct gl_shader_config alt = {
-		.req = {
-			.variant = SHADER_VARIANT_SOLID,
-			.input_is_premult = true,
-			.color_pre_curve = SHADER_COLOR_CURVE_IDENTITY,
-		},
-		.projection = sconf->projection,
-		.view_alpha = sconf->view_alpha,
-		.unicolor = { 0.40, 0.0, 0.0, 1.0 },
-	};
 	struct gl_surface_state *gs = get_surface_state(ev->surface);
 	bool recording_censor =
 		(output->disable_planes > 0) &&
@@ -943,7 +963,7 @@ maybe_censor_override(struct gl_shader_config *sconf,
 		(ev->surface->desired_protection > output->current_protection);
 
 	if (gs->direct_display) {
-		*sconf = alt;
+		censor_override(sconf, output);
 		return;
 	}
 
@@ -954,7 +974,7 @@ maybe_censor_override(struct gl_shader_config *sconf,
 		return;
 
 	if (recording_censor || unprotected_censor)
-		*sconf = alt;
+		censor_override(sconf, output);
 }
 
 static void
@@ -1044,9 +1064,6 @@ draw_paint_node(struct weston_paint_node *pnode,
 	else
 		filter = GL_NEAREST;
 
-	/* for triangle_fan_debug(), maybe_censor_override() */
-	assert(pnode->output->from_sRGB_to_blend == NULL);
-
 	if (!gl_shader_config_init_for_paint_node(&sconf, pnode, filter))
 		goto out;
 
@@ -1087,13 +1104,15 @@ draw_paint_node(struct weston_paint_node *pnode,
 		else
 			glDisable(GL_BLEND);
 
-		repaint_region(gr, pnode->view, &repaint, &surface_opaque, &alt);
+		repaint_region(gr, pnode->view, pnode->output,
+			       &repaint, &surface_opaque, &alt);
 		gs->used_in_output_repaint = true;
 	}
 
 	if (pixman_region32_not_empty(&surface_blend)) {
 		glEnable(GL_BLEND);
-		repaint_region(gr, pnode->view, &repaint, &surface_blend, &sconf);
+		repaint_region(gr, pnode->view, pnode->output,
+			       &repaint, &surface_blend, &sconf);
 		gs->used_in_output_repaint = true;
 	}