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From f05a90e5f8d1d0af60e2c684cbe9f1327c33135a Mon Sep 17 00:00:00 2001
From: Alexandros Frantzis <alexandros.frantzis@linaro.org>
Date: Fri, 18 Mar 2011 14:36:15 +0200
Subject: [PATCH 27/40] Add simple support for the r8g8b8a8 and r8g8b8x8 formats.

This format is particularly useful on big-endian architectures, where RGBA in
memory/file order corresponds to r8g8b8a8 as an uint32_t. This is important
because RGBA is in some cases the only available choice (for example as a pixel
format in OpenGL ES 2.0).
---
 pixman/pixman-access.c |   97 ++++++++++++++++++++++++++++++++++++++++++++++++
 pixman/pixman.c        |    6 +++
 pixman/pixman.h        |    6 ++-
 3 files changed, 108 insertions(+), 1 deletions(-)

diff --git a/pixman/pixman-access.c b/pixman/pixman-access.c
index f1ce0ba..32c4d8b 100644
--- a/pixman/pixman-access.c
+++ b/pixman/pixman-access.c
@@ -211,6 +211,46 @@ fetch_scanline_b8g8r8x8 (pixman_image_t *image,
 }
 
 static void
+fetch_scanline_r8g8b8a8 (pixman_image_t *image,
+                         int             x,
+                         int             y,
+                         int             width,
+                         uint32_t *      buffer,
+                         const uint32_t *mask)
+{
+    const uint32_t *bits = image->bits.bits + y * image->bits.rowstride;
+    const uint32_t *pixel = (uint32_t *)bits + x;
+    const uint32_t *end = pixel + width;
+
+    while (pixel < end)
+    {
+	uint32_t p = READ (image, pixel++);
+
+	*buffer++ = (((p & 0x000000ff) << 24) | (p >> 8));
+    }
+}
+
+static void
+fetch_scanline_r8g8b8x8 (pixman_image_t *image,
+                         int             x,
+                         int             y,
+                         int             width,
+                         uint32_t *      buffer,
+                         const uint32_t *mask)
+{
+    const uint32_t *bits = image->bits.bits + y * image->bits.rowstride;
+    const uint32_t *pixel = (uint32_t *)bits + x;
+    const uint32_t *end = pixel + width;
+    
+    while (pixel < end)
+    {
+	uint32_t p = READ (image, pixel++);
+	
+	*buffer++ = (0xff000000 | (p >> 8));
+    }
+}
+
+static void
 fetch_scanline_x14r6g6b6 (pixman_image_t *image,
                           int             x,
                           int             y,
@@ -1292,6 +1332,28 @@ fetch_pixel_b8g8r8x8 (bits_image_t *image,
 }
 
 static uint32_t
+fetch_pixel_r8g8b8a8 (bits_image_t *image,
+		      int           offset,
+		      int           line)
+{
+    uint32_t *bits = image->bits + line * image->rowstride;
+    uint32_t pixel = READ (image, (uint32_t *)bits + offset);
+    
+    return (((pixel & 0x000000ff) << 24) | (pixel >> 8));
+}
+
+static uint32_t
+fetch_pixel_r8g8b8x8 (bits_image_t *image,
+		      int           offset,
+		      int           line)
+{
+    uint32_t *bits = image->bits + line * image->rowstride;
+    uint32_t pixel = READ (image, (uint32_t *)bits + offset);
+    
+    return (0xff000000 | (pixel >> 8));
+}
+
+static uint32_t
 fetch_pixel_x14r6g6b6 (bits_image_t *image,
                        int           offset,
                        int           line)
@@ -2028,6 +2090,39 @@ store_scanline_b8g8r8x8 (bits_image_t *  image,
 }
 
 static void
+store_scanline_r8g8b8a8 (bits_image_t *  image,
+                         int             x,
+                         int             y,
+                         int             width,
+                         const uint32_t *values)
+{
+    uint32_t *bits = image->bits + image->rowstride * y;
+    uint32_t *pixel = (uint32_t *)bits + x;
+    int i;
+    
+    for (i = 0; i < width; ++i)
+    {
+	WRITE (image, pixel++,
+	       ((values[i] >> 24) & 0x000000ff) | (values[i] << 8));
+    }
+}
+
+static void
+store_scanline_r8g8b8x8 (bits_image_t *  image,
+                         int             x,
+                         int             y,
+                         int             width,
+                         const uint32_t *values)
+{
+    uint32_t *bits = image->bits + image->rowstride * y;
+    uint32_t *pixel = (uint32_t *)bits + x;
+    int i;
+    
+    for (i = 0; i < width; ++i)
+	WRITE (image, pixel++, (values[i] << 8));
+}
+
+static void
 store_scanline_x14r6g6b6 (bits_image_t *  image,
                           int             x,
                           int             y,
@@ -2845,6 +2940,8 @@ static const format_info_t accessors[] =
     FORMAT_INFO (x8b8g8r8),
     FORMAT_INFO (b8g8r8a8),
     FORMAT_INFO (b8g8r8x8),
+    FORMAT_INFO (r8g8b8a8),
+    FORMAT_INFO (r8g8b8x8),
     FORMAT_INFO (x14r6g6b6),
 
 /* 24bpp formats */
diff --git a/pixman/pixman.c b/pixman/pixman.c
index ec565f9..f21af2f 100644
--- a/pixman/pixman.c
+++ b/pixman/pixman.c
@@ -873,6 +873,8 @@ color_to_pixel (pixman_color_t *     color,
           format == PIXMAN_x8b8g8r8     ||
           format == PIXMAN_b8g8r8a8     ||
           format == PIXMAN_b8g8r8x8     ||
+          format == PIXMAN_r8g8b8a8     ||
+          format == PIXMAN_r8g8b8x8     ||
           format == PIXMAN_r5g6b5       ||
           format == PIXMAN_b5g6r5       ||
           format == PIXMAN_a8           ||
@@ -895,6 +897,8 @@ color_to_pixel (pixman_color_t *     color,
 	    ((c & 0x0000ff00) <<  8) |
 	    ((c & 0x000000ff) << 24);
     }
+    if (PIXMAN_FORMAT_TYPE (format) == PIXMAN_TYPE_RGBA)
+	c = ((c & 0xff000000) >> 24) | (c << 8);
 
     if (format == PIXMAN_a1)
 	c = c >> 31;
@@ -1105,6 +1109,8 @@ pixman_format_supported_source (pixman_format_code_t format)
     case PIXMAN_x8b8g8r8:
     case PIXMAN_b8g8r8a8:
     case PIXMAN_b8g8r8x8:
+    case PIXMAN_r8g8b8a8:
+    case PIXMAN_r8g8b8x8:
     case PIXMAN_r8g8b8:
     case PIXMAN_b8g8r8:
     case PIXMAN_r5g6b5:
diff --git a/pixman/pixman.h b/pixman/pixman.h
index 1305bc1..59d0760 100644
--- a/pixman/pixman.h
+++ b/pixman/pixman.h
@@ -650,11 +650,13 @@ struct pixman_indexed
 #define PIXMAN_TYPE_YUY2	6
 #define PIXMAN_TYPE_YV12	7
 #define PIXMAN_TYPE_BGRA	8
+#define PIXMAN_TYPE_RGBA	9
 
 #define PIXMAN_FORMAT_COLOR(f)				\
 	(PIXMAN_FORMAT_TYPE(f) == PIXMAN_TYPE_ARGB ||	\
 	 PIXMAN_FORMAT_TYPE(f) == PIXMAN_TYPE_ABGR ||	\
-	 PIXMAN_FORMAT_TYPE(f) == PIXMAN_TYPE_BGRA)
+	 PIXMAN_FORMAT_TYPE(f) == PIXMAN_TYPE_BGRA ||	\
+	 PIXMAN_FORMAT_TYPE(f) == PIXMAN_TYPE_RGBA)
 
 /* 32bpp formats */
 typedef enum {
@@ -664,6 +666,8 @@ typedef enum {
     PIXMAN_x8b8g8r8 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_ABGR,0,8,8,8),
     PIXMAN_b8g8r8a8 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_BGRA,8,8,8,8),
     PIXMAN_b8g8r8x8 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_BGRA,0,8,8,8),
+    PIXMAN_r8g8b8a8 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_RGBA,8,8,8,8),
+    PIXMAN_r8g8b8x8 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_RGBA,0,8,8,8),
     PIXMAN_x14r6g6b6 =	 PIXMAN_FORMAT(32,PIXMAN_TYPE_ARGB,0,6,6,6),
     PIXMAN_x2r10g10b10 = PIXMAN_FORMAT(32,PIXMAN_TYPE_ARGB,0,10,10,10),
     PIXMAN_a2r10g10b10 = PIXMAN_FORMAT(32,PIXMAN_TYPE_ARGB,2,10,10,10),
-- 
1.6.6.1