63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
#include <gint/image.h>
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#include <stdlib.h>
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#include <string.h>
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static void copy_row_rgb16(uint16_t *src, uint16_t *dst, int src_alpha,
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int dst_alpha, int width)
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{
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for(int x = 0; x < width; x++) {
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int px = src[x];
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if(px != src_alpha)
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dst[x] = px - (px == dst_alpha);
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}
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}
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static void copy_row_p8(int8_t *src, int8_t *dst, int src_alpha, int width)
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{
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for(int x = 0; x < width; x++) {
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int px = src[x];
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if(px != src_alpha)
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dst[x] = px;
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}
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}
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void image_vflip(image_t const *src, image_t *dst)
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{
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if(!image_target(src, dst, DATA_RW, SAME_DEPTH, SAME_SIZE))
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return;
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int h = src->height;
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void *src_top = src->data;
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void *src_bot = src->data + (h - 1) * src->stride;
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void *dst_top = dst->data;
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void *dst_bot = dst->data + (h - 1) * dst->stride;
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int src_alpha = image_alpha(src->format);
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int dst_alpha = image_alpha(dst->format);
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int row_length = src->stride;
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void *row = malloc(row_length);
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if(!row)
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return;
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for(int y = 0; y < (h + 1) >> 1; y++) {
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memcpy(row, src_top, row_length);
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if(IMAGE_IS_RGB16(src->format)) {
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copy_row_rgb16(src_bot, dst_top, src_alpha, dst_alpha, src->width);
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copy_row_rgb16(row, dst_bot, src_alpha, dst_alpha, src->width);
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}
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else {
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copy_row_p8(src_bot, dst_top, src_alpha, src->width);
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copy_row_p8(row, dst_bot, src_alpha, src->width);
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}
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src_top += src->stride;
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src_bot -= src->stride;
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dst_top += dst->stride;
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dst_bot -= dst->stride;
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}
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free(row);
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}
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