78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
#include <libimg.h>
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#include "libimg-internal.h"
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void img_hflip(img_t src, img_t dst)
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{
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if(!img_target(dst, src.width, src.height)) return;
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img_pixel_t *src_px = src.pixels;
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img_pixel_t *dst_px = dst.pixels;
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for(int y = 0; y < src.height; y++)
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{
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for(int x = 0; x < (src.width+1) >> 1; x++)
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{
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int a = src_px[x];
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int b = src_px[src.width-1 - x];
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if(b != IMG_ALPHA)
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dst_px[x] = b;
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if(a != IMG_ALPHA)
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dst_px[src.width-1 - x] = a;
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}
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src_px += src.stride;
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dst_px += dst.stride;
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}
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}
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img_t img_hflip_create(img_t src)
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{
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img_t dst = img_create(src.width, src.height);
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img_fill(dst, IMG_ALPHA);
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img_hflip(src, dst);
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return dst;
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}
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void img_vflip(img_t src, img_t dst)
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{
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if(!img_target(dst, src.width, src.height)) return;
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int src_fullheight = (src.height - 1) * src.stride;
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int dst_fullheight = (src.height - 1) * dst.stride;
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img_pixel_t *src_px = src.pixels;
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img_pixel_t *dst_px = dst.pixels;
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for(int x = 0; x < src.width; x++)
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{
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int src_offset = 0;
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int dst_offset = 0;
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for(int y = 0; y < (src.height+1) >> 1; y++)
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{
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int a = src_px[src_offset];
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int b = src_px[src_fullheight - src_offset];
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if(b != IMG_ALPHA)
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dst_px[dst_offset] = b;
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if(a != IMG_ALPHA)
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dst_px[dst_fullheight - dst_offset] = a;
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src_offset += src.stride;
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dst_offset += dst.stride;
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}
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src_px++;
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dst_px++;
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}
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}
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img_t img_vflip_create(img_t src)
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{
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img_t dst = img_create(src.width, src.height);
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img_fill(dst, IMG_ALPHA);
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img_hflip(src, dst);
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return dst;
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}
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