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c200: First implemention of lcd_yuv_blit(). mpegplayer works now, but speed can be optimized more and dithering is not yet implemented.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15020 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-10-07 17:54:49 +00:00
parent e3e0a3a169
commit d1e2f5240c
3 changed files with 285 additions and 8 deletions
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49
firmware/target/arm/sandisk/sansa-c200/lcd-c200.c
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@ -206,19 +206,49 @@ void lcd_blit(const fb_data* data, int x, int by, int width,
(void)stride;
}
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
int width,
int stride);
/* Performance function to blit a YUV bitmap directly to the LCD */
void lcd_yuv_blit(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
(void)src;
(void)src_x;
(void)src_y;
(void)stride;
(void)x;
(void)y;
(void)width;
(void)height;
unsigned char const * yuv_src[3];
off_t z;
/* Sorry, but width and height must be >= 2 or else */
width &= ~1;
height >>= 1;
y += 0x1a;
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]);
lcd_send_command(R_ENTRY_MODE);
lcd_send_command(0x80);
lcd_send_command(R_X_ADDR_AREA);
lcd_send_command(x);
lcd_send_command(x + width - 1);
do
{
lcd_send_command(R_Y_ADDR_AREA);
lcd_send_command(y);
lcd_send_command(y + 1);
lcd_write_yuv420_lines(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;
y += 2;
}
while (--height > 0);
}
/* Update the display.
@ -239,6 +269,9 @@ void lcd_update_rect(int x0, int y0, int width, int height)
if ((x1 <= 0) || (y1 <= 0))
return;
lcd_send_command(R_ENTRY_MODE);
lcd_send_command(0x82);
if(y1 >= LCD_HEIGHT)
y1 = LCD_HEIGHT - 1;