From 855e3c6f0f7b32375b054781fd4d419e1b0fc306 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <pamaury@rockbox.org>
Date: Sun, 24 Jul 2011 19:12:27 +0000
Subject: imx233/fuze+: implement lcd_blit_yuv (untested)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30207 a1c6a512-1295-4272-9138-f99709370657
---
 .../arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c       | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)

(limited to 'firmware')

diff --git a/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c b/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
index dba54373be..2e49e4d3d0 100644
--- a/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
+++ b/firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
@@ -18,6 +18,7 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
+#include <sys/types.h> /* off_t */
 #include <string.h>
 #include "cpu.h"
 #include "system.h"
@@ -35,6 +36,8 @@
 extern void lcd_copy_buffer_rect(fb_data *dst, const fb_data *src,
                                  int width, int height);
 
+static unsigned lcd_yuv_options = 0;
+
 #ifdef HAVE_LCD_ENABLE
 static bool lcd_on = false;
 #endif
@@ -517,3 +520,74 @@ void lcd_update_rect(int x, int y, int width, int height)
     (void) height;
     lcd_update();
 }
+
+void lcd_yuv_set_options(unsigned options)
+{
+    lcd_yuv_options = options;
+}
+
+/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
+extern void lcd_write_yuv420_lines(fb_data *dst,
+                                   unsigned char const * const src[3],
+                                   int width,
+                                   int stride);
+extern void lcd_write_yuv420_lines_odither(fb_data *dst,
+                                           unsigned char const * const src[3],
+                                           int width,
+                                           int stride,
+                                           int x_screen, /* To align dither pattern */
+                                           int y_screen);
+/* Performance function to blit a YUV bitmap directly to the LCD */
+/* So the LCD_WIDTH is now the height */
+void lcd_blit_yuv(unsigned char * const src[3],
+                  int src_x, int src_y, int stride,
+                  int x, int y, int width, int height)
+{
+    /* Caches for chroma data so it only need be recaculated every other
+       line */
+    unsigned char const * yuv_src[3];
+    off_t z;
+
+#ifdef HAVE_LCD_ENABLE
+    if (!lcd_on)
+        return;
+#endif
+
+    /* Sorry, but width and height must be >= 2 or else */
+    width &= ~1;
+    height >>= 1;
+
+    y = LCD_WIDTH - 1 - y;
+    fb_data *dst = (fb_data*)FRAME + x * LCD_WIDTH + y;
+
+    z = stride*src_y;
+    yuv_src[0] = src[0] + z + src_x;
+    yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
+    yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
+
+    if (lcd_yuv_options & LCD_YUV_DITHER)
+    {
+        do
+        {
+            lcd_write_yuv420_lines_odither(dst, yuv_src, width, stride, y, x);
+            yuv_src[0] += stride << 1; /* Skip down two luma lines */
+            yuv_src[1] += stride >> 1; /* Skip down one chroma line */
+            yuv_src[2] += stride >> 1;
+            dst -= 2;
+            y -= 2;
+        }
+        while (--height > 0);
+    }
+    else
+    {
+        do
+        {
+            lcd_write_yuv420_lines(dst, yuv_src, width, stride);
+            yuv_src[0] += stride << 1; /* Skip down two luma lines */
+            yuv_src[1] += stride >> 1; /* Skip down one chroma line */
+            yuv_src[2] += stride >> 1;
+            dst -= 2;
+        }
+        while (--height > 0);
+    }
+}
-- 
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