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D2: A working implementation of lcd_blit_yuv() by Thibaut Girka.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18000 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rob Purchase 2008-07-09 20:51:47 +00:00
parent 0eb51e8a73
commit b564ac44cd
2 changed files with 86 additions and 8 deletions
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1
docs/CREDITS
View file

@ -397,6 +397,7 @@ Mike Burke
Michael Chicoine
Maciej Adamczak
Tomer Shalev
Thibaut Girka
The libmad team
The wavpack team

93
firmware/target/arm/tcc780x/cowond2/lcd-cowond2.c
View file

@ -359,10 +359,88 @@ void lcd_yuv_set_options(unsigned 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);
static void lcd_write_yuv420_lines(fb_data *dst,
unsigned char const * const src[3],
int width,
int stride)
{
int i = 0;
int y;
int rv, guv, bu;
int cb, cr;
int r, g, b;
unsigned const char *y_p = src[0];
for (i = 0; i < width/2; i++)
{
y_p++;
/* YCbCr -> RGB conversion */
cb = src[1][i] - 128;
cr = src[2][i] - 128;
rv = (cr*101 + 56) >> 9;
guv = (128 - cr*51 + cb*24) >> 8;
bu = (cb*128 + 256) >> 9;
y = (*y_p - 16)*74;
r = (y >> 9) + rv;
g = (y >> 8) + guv;
b = (y >> 9) + bu;
if (r < 0) r = 0;
else if (r > 31) r = 31;
if (g < 0) g = 0;
else if (g > 63) g = 63;
if (b < 0) b = 0;
else if (b > 31) b = 31;
dst[i*2] = (r << 11) | (g << 5) | b;
/* YCbCr -> RGB conversion */
y = (*(y_p+stride) - 16)*74;
r = (y >> 9) + rv;
g = (y >> 8) + guv;
b = (y >> 9) + bu;
if (r < 0) r = 0;
else if (r > 31) r = 31;
if (g < 0) g = 0;
else if (g > 63) g = 63;
if (b < 0) b = 0;
else if (b > 31) b = 31;
dst[i*2+LCD_FBWIDTH] = (r << 11) | (g << 5) | b;
y_p++;
/* YCbCr -> RGB conversion */
y = (*y_p - 16)*74;
r = (y >> 9) + rv;
g = (y >> 8) + guv;
b = (y >> 9) + bu;
if (r < 0) r = 0;
else if (r > 31) r = 31;
if (g < 0) g = 0;
else if (g > 63) g = 63;
if (b < 0) b = 0;
else if (b > 31) b = 31;
dst[i*2+1] = (r << 11) | (g << 5) | b;
/* YCbCr -> RGB conversion */
y = (*(y_p+stride) - 16)*74;
r = (y >> 9) + rv;
g = (y >> 8) + guv;
b = (y >> 9) + bu;
if (r < 0) r = 0;
else if (r > 31) r = 31;
if (g < 0) g = 0;
else if (g > 63) g = 63;
if (b < 0) b = 0;
else if (b > 31) b = 31;
dst[i*2+1+LCD_FBWIDTH] = (r << 11) | (g << 5) | b;
}
}
extern void lcd_write_yuv420_lines_odither(fb_data *dst,
unsigned char const * const src[3],
int width,
@ -385,8 +463,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
width &= ~1;
height >>= 1;
y = LCD_WIDTH - 1 - y;
fb_data *dst = &lcd_driver_framebuffer[x][y];
fb_data *dst = &lcd_driver_framebuffer[y][x];
z = stride*src_y;
yuv_src[0] = src[0] + z + src_x;
@ -401,7 +478,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
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;
dst += 2*LCD_FBWIDTH;
y -= 2;
}
while (--height > 0);
@ -414,7 +491,7 @@ void lcd_blit_yuv(unsigned char * const src[3],
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;
dst += 2*LCD_FBWIDTH;
}
while (--height > 0);
}