40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
#include <gint/image.h>
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#include <string.h>
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#undef image_sub
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static image_t image_sub_default;
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image_t *image_sub(image_t const *src, int left, int top, int w, int h,
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image_t *dst)
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{
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if(!dst)
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dst = &image_sub_default;
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if(w < 0)
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w = src->width - left;
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if(h < 0)
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h = src->height - top;
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struct gint_image_box box = { 0, 0, w, h, left, top };
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if(!image_valid(src) || IMAGE_IS_P4(src->format) ||
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!gint_image_clip_input(src, &box, w, h)) {
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memset(dst, 0, sizeof *dst);
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return dst;
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}
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int const ro_flags = IMAGE_FLAGS_DATA_RO | IMAGE_FLAGS_PALETTE_RO;
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dst->format = src->format;
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dst->flags = src->flags & ro_flags;
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dst->color_count = src->color_count;
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dst->width = box.w;
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dst->height = box.h;
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dst->stride = src->stride;
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if(IMAGE_IS_RGB16(src->format))
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dst->data = src->data + box.top * src->stride + 2 * box.left;
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else if(IMAGE_IS_P8(src->format))
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dst->data = src->data + box.top * src->stride + box.left;
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dst->palette = src->palette;
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return dst;
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}
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