1 #include "gd.h" 2 gdImageFlipVertical(gdImagePtr im)3void gdImageFlipVertical(gdImagePtr im) 4 { 5 register int x, y; 6 7 if (im->trueColor) { 8 for (y = 0; y < im->sy / 2; y++) { 9 int *row_dst = im->tpixels[y]; 10 int *row_src = im->tpixels[im->sy - 1 - y]; 11 for (x = 0; x < im->sx; x++) { 12 register int p; 13 p = row_dst[x]; 14 row_dst[x] = im->tpixels[im->sy - 1 - y][x]; 15 row_src[x] = p; 16 } 17 } 18 } else { 19 unsigned char p; 20 for (y = 0; y < im->sy / 2; y++) { 21 for (x = 0; x < im->sx; x++) { 22 p = im->pixels[y][x]; 23 im->pixels[y][x] = im->pixels[im->sy - 1 - y][x]; 24 im->pixels[im->sy - 1 - y][x] = p; 25 } 26 } 27 } 28 return; 29 } 30 gdImageFlipHorizontal(gdImagePtr im)31void gdImageFlipHorizontal(gdImagePtr im) 32 { 33 34 int x, y; 35 36 if (im->trueColor) { 37 int *px1, *px2, tmp; 38 39 for (y = 0; y < im->sy; y++) { 40 px1 = im->tpixels[y]; 41 px2 = im->tpixels[y] + im->sx - 1; 42 for (x = 0; x < (im->sx >> 1); x++) { 43 tmp = *px1; 44 *px1 = *px2; 45 *px2 = tmp; 46 px1++; 47 px2--; 48 } 49 } 50 } else { 51 unsigned char *px1, *px2, tmp; 52 53 for (y = 0; y < im->sy; y++) { 54 px1 = im->pixels[y]; 55 px2 = im->pixels[y] + im->sx - 1; 56 for (x = 0; x < (im->sx >> 1); x++) { 57 tmp = *px1; 58 *px1 = *px2; 59 *px2 = tmp; 60 px1++; 61 px2--; 62 } 63 } 64 } 65 } 66 gdImageFlipBoth(gdImagePtr im)67void gdImageFlipBoth(gdImagePtr im) 68 { 69 gdImageFlipVertical(im); 70 gdImageFlipHorizontal(im); 71 } 72 73 74
