[cairo] [patch] gl/traps: ensure RGBA surface before upload image to texture for GLES2

[Henry (Yu) Song - SISA]

>From 5f5ef3030db287dd2a925b80a22cf3012c5b84d9 Mon Sep 17 00:00:00 2001
From: Henry Song <henry.song at samsung.com>
Date: Thu, 27 Sep 2012 12:19:40 -0700
Subject: [PATCH] gl/traps: we need to create RGBA format image when uploading
 it to texture for GLES2.

---
 src/cairo-gl-traps-compositor.c |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/src/cairo-gl-traps-compositor.c b/src/cairo-gl-traps-compositor.c
index a87fd16..13b1d4f 100644
--- a/src/cairo-gl-traps-compositor.c
+++ b/src/cairo-gl-traps-compositor.c
@@ -50,6 +50,7 @@
 #include "cairo-image-surface-private.h"
 #include "cairo-spans-compositor-private.h"
 #include "cairo-surface-backend-private.h"
+#include "cairo-surface-offset-private.h"
 
 static cairo_int_status_t
 acquire (void *abstract_dst)
@@ -281,6 +282,8 @@ traps_to_operand (void *_dst,
     pixman_format_code_t pixman_format;
     pixman_image_t *pixman_image;
     cairo_surface_t *image, *mask;
+    cairo_surface_t *orig_image = NULL; 
+    cairo_surface_t *rgba_image = NULL;
     cairo_surface_pattern_t pattern;
     cairo_status_t status;
 
@@ -300,12 +303,43 @@ traps_to_operand (void *_dst,
 	return image->status;
     }
 
+    /* GLES2 only supports RGB/RGBA when uploading */
+    if (_cairo_gl_get_flavor () == CAIRO_GL_FLAVOR_ES) {
+	cairo_pattern_t *pat = cairo_pattern_create_for_surface (image);
+	int image_width = ((cairo_image_surface_t *) image)->width;
+	int image_height = ((cairo_image_surface_t *) image)->height;
+	pixman_format_code_t rgba_format = PIXMAN_r8g8b8a8;
+
+	if (_cairo_is_little_endian ())
+	    rgba_format = PIXMAN_a8b8g8r8;
+
+	rgba_image = 
+	    _cairo_image_surface_create_with_pixman_format (NULL,
+							    rgba_format,
+							    image_width,
+							    image_height,
+							    -1);
+	status = _cairo_surface_offset_paint (rgba_image, 0, 0,
+					      CAIRO_OPERATOR_SOURCE,
+					      pat, NULL);
+	if (unlikely (status)) {
+	    cairo_surface_destroy (image);
+	    cairo_surface_destroy (rgba_image);
+	    return status;
+	}
+	
+	orig_image = image;
+	image = rgba_image;
+    }
+
     mask = _cairo_surface_create_similar_scratch (_dst,
 						  CAIRO_CONTENT_COLOR_ALPHA,
 						  extents->width,
 						  extents->height);
     if (unlikely (mask->status)) {
 	cairo_surface_destroy (image);
+	if (orig_image)
+	    cairo_surface_destroy (orig_image);
 	return mask->status;
     }
 
@@ -315,6 +349,9 @@ traps_to_operand (void *_dst,
 					   extents->width, extents->height,
 					   0, 0);
     cairo_surface_destroy (image);
+    if (orig_image)
+	cairo_surface_destroy (orig_image);
+
     if (unlikely (status))
 	goto error;
 
-- 
1.7.9.5