123 lines
2.1 KiB
C
123 lines
2.1 KiB
C
/**
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* File: Transformations
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif /* HAVE_CONFIG_H */
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#include "gd.h"
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/**
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* Function: gdImageFlipVertical
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*
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* Flip an image vertically
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*
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* The image is mirrored upside-down.
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*
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* Parameters:
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* im - The image.
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*
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* See also:
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* - <gdImageFlipHorizontal>
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* - <gdImageFlipBoth>
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*/
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BGD_DECLARE(void) gdImageFlipVertical(gdImagePtr im)
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{
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register int x, y;
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if (im->trueColor) {
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for (y = 0; y < im->sy / 2; y++) {
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int *row_dst = im->tpixels[y];
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int *row_src = im->tpixels[im->sy - 1 - y];
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for (x = 0; x < im->sx; x++) {
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register int p;
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p = row_dst[x];
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row_dst[x] = im->tpixels[im->sy - 1 - y][x];
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row_src[x] = p;
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}
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}
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} else {
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unsigned char p;
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for (y = 0; y < im->sy / 2; y++) {
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for (x = 0; x < im->sx; x++) {
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p = im->pixels[y][x];
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im->pixels[y][x] = im->pixels[im->sy - 1 - y][x];
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im->pixels[im->sy - 1 - y][x] = p;
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}
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}
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}
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return;
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}
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/**
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* Function: gdImageFlipHorizontal
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*
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* Flip an image horizontally
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*
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* The image is mirrored left-right.
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*
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* Parameters:
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* im - The image.
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*
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* See also:
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* - <gdImageFlipVertical>
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* - <gdImageFlipBoth>
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*/
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BGD_DECLARE(void) gdImageFlipHorizontal(gdImagePtr im)
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{
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int x, y;
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if (im->trueColor) {
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int *px1, *px2, tmp;
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for (y = 0; y < im->sy; y++) {
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px1 = im->tpixels[y];
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px2 = im->tpixels[y] + im->sx - 1;
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for (x = 0; x < (im->sx >> 1); x++) {
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tmp = *px1;
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*px1 = *px2;
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*px2 = tmp;
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px1++;
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px2--;
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}
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}
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} else {
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unsigned char *px1, *px2, tmp;
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for (y = 0; y < im->sy; y++) {
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px1 = im->pixels[y];
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px2 = im->pixels[y] + im->sx - 1;
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for (x = 0; x < (im->sx >> 1); x++) {
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tmp = *px1;
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*px1 = *px2;
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*px2 = tmp;
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px1++;
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px2--;
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}
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}
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}
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}
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/**
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* Function: gdImageFlipBoth
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*
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* Flip an image vertically and horizontally
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*
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* The image is mirrored upside-down and left-right.
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*
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* Parameters:
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* im - The image.
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*
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* See also:
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* - <gdImageFlipVertical>
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* - <gdImageFlipHorizontal>
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*/
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BGD_DECLARE(void) gdImageFlipBoth(gdImagePtr im)
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{
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gdImageFlipVertical(im);
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gdImageFlipHorizontal(im);
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}
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