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M:Robe 500 - Improve YUV blit speed.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25228 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Karl Kurbjun 2010-03-17 01:44:20 +00:00
parent 6b7f95289e
commit bda2e6d675
1 changed files with 17 additions and 24 deletions
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41
firmware/target/arm/tms320dm320/mrobe-500/lcd-mr500.c
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@ -175,6 +175,8 @@ void lcd_init_device(void)
/* 38: output, non-inverted, no-irq, falling edge, no-chat, B2 */
dm320_set_io(38, false, false, false, false, false, 0x02);
/* Enable clocks for display */
IO_CLK_MOD1 |= (CLK_MOD1_VENC | CLK_MOD1_OSD);
/* Clear the Frame */
memset16(FRAME, 0x0000, LCD_WIDTH*LCD_HEIGHT);
@ -649,11 +651,6 @@ void lcd_pal256_update_pal(fb_data *palette)
}
}
#endif
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) __attribute__ ((section(".icode")));
/* Performance function to blit a YUV bitmap directly to the LCD */
/* Show it rotated so the LCD_WIDTH is now the height */
@ -661,7 +658,7 @@ 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)
{
register unsigned char const * yuv_src[3];
unsigned char const * yuv_src[3];
if (!lcd_on)
return;
@ -699,31 +696,26 @@ void lcd_blit_yuv(unsigned char * const src[3],
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
}
register int cbcr_remain=(stride>>1)-(width>>1);
register int y_remain=(stride<<1)-width;
int cbcr_remain=(stride>>1)-(width>>1);
int y_remain=(stride<<1)-width;
do
{
register fb_data *c_dst=dst;
register int c_width=width;
register unsigned int *c_dst=(unsigned int*)dst;
do
{
/* This needs to be done in a block of 4 pixels */
register unsigned short Y=*((unsigned short*)yuv_src[0]);
register unsigned short Yst=*((unsigned short*)(yuv_src[0]+stride));
yuv_src[0]+=2;
*c_dst=*yuv_src[0]<<8 | *yuv_src[1];
*(c_dst+1)=*(yuv_src[0]+stride)<<8 | *yuv_src[2];
c_dst-=(LCD_NATIVE_WIDTH+LCD_FUDGE);
register unsigned char Cb=*yuv_src[1]++;
register unsigned char Cr=*yuv_src[2]++;
yuv_src[0]++;
*c_dst=*yuv_src[0]<<8 | *yuv_src[1];
*(c_dst+1)=*(yuv_src[0]+stride)<<8 | *yuv_src[2];
c_dst-=(LCD_NATIVE_WIDTH+LCD_FUDGE);
yuv_src[0]++;
yuv_src[1]++;
yuv_src[2]++;
*c_dst = (Yst<<24) | (Cr << 16) | ((Y&0xFF)<<8) | Cb;
*(c_dst - (LCD_NATIVE_WIDTH+LCD_FUDGE)/2) =
( (Yst&0xFF00)<<16) | (Cr << 16) | (Y&0xFF00) | Cb;
c_dst -= (LCD_NATIVE_WIDTH+LCD_FUDGE);
c_width -= 2;
}
@ -732,6 +724,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
yuv_src[0] += y_remain; /* Skip down two luma lines-width */
yuv_src[1] += cbcr_remain; /* Skip down one chroma line-width/2 */
yuv_src[2] += cbcr_remain;
dst+=2;
}
while (--height > 0);