180 lines
3.9 KiB
C
180 lines
3.9 KiB
C
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#include <string.h>
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#include "lcd.h"
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void lcd_copy_buffer_rect(fb_data *dst, fb_data *src, int width, int height)
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{
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do {
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memcpy(dst, src, width * sizeof(fb_data));
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src += LCD_WIDTH;
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dst += LCD_WIDTH;
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} while (--height);
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}
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#define YFAC (74)
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#define RVFAC (101)
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#define GUFAC (-24)
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#define GVFAC (-51)
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#define BUFAC (128)
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static inline int clamp(int val, int min, int max)
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{
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if (val < min)
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val = min;
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else if (val > max)
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val = max;
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return val;
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}
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extern void lcd_write_yuv420_lines(fb_data *dst,
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unsigned char const * const src[3],
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int width,
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int stride)
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{
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/* Draw a partial YUV colour bitmap - similiar behavior to lcd_blit_yuv
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in the core */
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const unsigned char *ysrc, *usrc, *vsrc;
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fb_data *row_end;
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/* width and height must be >= 2 and an even number */
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width &= ~1;
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#if LCD_WIDTH >= LCD_HEIGHT
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row_end = dst + width;
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#else
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row_end = dst + LCD_WIDTH * width;
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#endif
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ysrc = src[0];
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usrc = src[1];
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vsrc = src[2];
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/* stride => amount to jump from end of last row to start of next */
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stride -= width;
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/* upsampling, YUV->RGB conversion and reduction to RGB in one go */
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do
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{
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int y, cb, cr, rv, guv, bu, r, g, b;
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y = YFAC*(*ysrc++ - 16);
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cb = *usrc++ - 128;
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cr = *vsrc++ - 128;
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rv = RVFAC*cr;
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guv = GUFAC*cb + GVFAC*cr;
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bu = BUFAC*cb;
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r = y + rv;
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g = y + guv;
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b = y + bu;
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if ((unsigned)(r | g | b) > 64*256-1)
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{
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r = clamp(r, 0, 64*256-1);
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g = clamp(g, 0, 64*256-1);
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b = clamp(b, 0, 64*256-1);
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}
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*dst = FB_RGBPACK(r >> 6, g >> 6, b >> 6);
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#if LCD_WIDTH >= LCD_HEIGHT
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dst++;
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#else
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dst += LCD_WIDTH;
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#endif
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y = YFAC*(*ysrc++ - 16);
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r = y + rv;
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g = y + guv;
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b = y + bu;
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if ((unsigned)(r | g | b) > 64*256-1)
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{
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r = clamp(r, 0, 64*256-1);
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g = clamp(g, 0, 64*256-1);
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b = clamp(b, 0, 64*256-1);
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}
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*dst = FB_RGBPACK(r >> 6, g >> 6, b >> 6);
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#if LCD_WIDTH >= LCD_HEIGHT
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dst++;
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#else
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dst += LCD_WIDTH;
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#endif
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}
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while (dst < row_end);
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ysrc += stride;
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usrc -= width >> 1;
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vsrc -= width >> 1;
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#if LCD_WIDTH >= LCD_HEIGHT
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row_end += LCD_WIDTH;
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dst += LCD_WIDTH - width;
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#else
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row_end -= 1;
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dst -= LCD_WIDTH*width + 1;
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#endif
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do
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{
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int y, cb, cr, rv, guv, bu, r, g, b;
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y = YFAC*(*ysrc++ - 16);
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cb = *usrc++ - 128;
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cr = *vsrc++ - 128;
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rv = RVFAC*cr;
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guv = GUFAC*cb + GVFAC*cr;
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bu = BUFAC*cb;
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r = y + rv;
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g = y + guv;
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b = y + bu;
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if ((unsigned)(r | g | b) > 64*256-1)
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{
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r = clamp(r, 0, 64*256-1);
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g = clamp(g, 0, 64*256-1);
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b = clamp(b, 0, 64*256-1);
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}
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*dst = FB_RGBPACK(r >> 6, g >> 6, b >> 6);
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#if LCD_WIDTH >= LCD_HEIGHT
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dst++;
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#else
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dst += LCD_WIDTH;
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#endif
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y = YFAC*(*ysrc++ - 16);
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r = y + rv;
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g = y + guv;
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b = y + bu;
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if ((unsigned)(r | g | b) > 64*256-1)
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{
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r = clamp(r, 0, 64*256-1);
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g = clamp(g, 0, 64*256-1);
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b = clamp(b, 0, 64*256-1);
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}
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*dst = FB_RGBPACK(r >> 6, g >> 6, b >> 6);
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#if LCD_WIDTH >= LCD_HEIGHT
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dst++;
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#else
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dst += LCD_WIDTH;
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#endif
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}
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while (dst < row_end);
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}
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void lcd_write_yuv420_lines_odither(fb_data *dst,
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unsigned char const * const src[3],
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int width, int stride,
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int x_screen, int y_screen)
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__attribute__((alias("lcd_write_yuv420_lines")));
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