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Jpeg Viewer: Add support for Vertical Strides

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22697 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Karl Kurbjun 2009-09-13 15:29:42 +00:00
parent 022463b46c
commit aa942e042b
1 changed files with 25 additions and 9 deletions
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34
apps/plugins/jpeg/yuv2rgb.c
View file

@ -236,7 +236,20 @@ static fb_data (* const pixel_funcs[COLOUR_NUM_MODES][DITHER_NUM_MODES])(void) =
[DITHER_DIFFUSION] = pixel_fsdither_to_lcd,
},
};
/* These defines are used fornormal horizontal strides and vertical strides. */
#if defined(LCD_STRIDEFORMAT) && LCD_STRIDEFORMAT == VERTICAL_STRIDE
#define LCDADDR(x, y) (rb->lcd_framebuffer + LCD_HEIGHT*(x) + (y))
#define ROWENDOFFSET (width*LCD_HEIGHT)
#define ROWOFFSET (1)
#define COLOFFSET (LCD_HEIGHT)
#else
#define LCDADDR(x, y) (rb->lcd_framebuffer + LCD_WIDTH*(y) + (x))
#define ROWENDOFFSET (width)
#define ROWOFFSET (LCD_WIDTH)
#define COLOFFSET (1)
#endif
/**
* Draw a partial YUV colour bitmap
*
@ -251,6 +264,7 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
fb_data *dst, *dst_end;
fb_data (*pixel_func)(void);
struct rgb_pixel px;
int dst_inc;
if (x + width > LCD_WIDTH)
width = LCD_WIDTH - x; /* Clip right */
@ -268,8 +282,8 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
pixel = &px;
dst = rb->lcd_framebuffer + LCD_WIDTH * y + x;
dst_end = dst + LCD_WIDTH * height;
dst = LCDADDR(x, y);
dst_end = LCDADDR(x, y+height);
if (colour_mode == COLOURMODE_GRAY)
csub_y = 0; /* Ignore Cb, Cr */
@ -304,15 +318,17 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
if (px.inc == 1)
{
/* Scan is L->R */
dst_inc = COLOFFSET;
dst_row = dst;
row_end = dst_row + width;
row_end = dst_row + ROWENDOFFSET;
px.col = src_x;
}
else
{
/* Scan is R->L */
row_end = dst - 1;
dst_row = row_end + width;
dst_inc = -COLOFFSET;
row_end = dst + dst_inc;
dst_row = row_end + ROWENDOFFSET;
px.col = src_x + width - 1;
}
@ -350,7 +366,7 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
px.b = y + bu;
*dst_row = pixel_func();
dst_row += px.inc;
dst_row += dst_inc;
if (dst_row == row_end)
break;
@ -379,13 +395,13 @@ void yuv_bitmap_part(unsigned char *src[3], int csub_x, int csub_y,
px.g = px.r = px.b = YFAC*(*ysrc);
*dst_row = pixel_func();
ysrc += px.inc;
dst_row += px.inc;
dst_row += dst_inc;
}
while (dst_row != row_end);
}
src_y++;
dst += LCD_WIDTH;
dst += ROWOFFSET;
}
while (dst < dst_end);
}