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imx233/fuze+: implement lcd_blit_yuv (untested)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30207 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly 2011-07-24 19:12:27 +00:00
parent 1df8072c08
commit 855e3c6f0f
1 changed files with 74 additions and 0 deletions
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74
firmware/target/arm/imx233/sansa-fuzeplus/lcd-fuzeplus.c
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@ -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);
}
}