BGD_DECLARE(int) gdImagePixelate(gdImagePtr im, int block_size, const unsigned int mode) { int x, y; if (block_size <= 0) { return 0; } else if (block_size == 1) { return 1; } switch (mode) { case GD_PIXELATE_UPPERLEFT: for (y = 0; y < im->sy; y += block_size) { for (x = 0; x < im->sx; x += block_size) { if (gdImageBoundsSafe(im, x, y)) { int c = gdImageGetPixel(im, x, y); gdImageFilledRectangle(im, x, y, x + block_size - 1, y + block_size - 1, c); } } } break; case GD_PIXELATE_AVERAGE: for (y = 0; y < im->sy; y += block_size) { for (x = 0; x < im->sx; x += block_size) { int a, r, g, b, c; int total; int cx, cy; a = r = g = b = c = total = 0; /* sampling */ for (cy = 0; cy < block_size; cy++) { for (cx = 0; cx < block_size; cx++) { if (!gdImageBoundsSafe(im, x + cx, y + cy)) { continue; } c = gdImageGetPixel(im, x + cx, y + cy); a += gdImageAlpha(im, c); r += gdImageRed(im, c); g += gdImageGreen(im, c); b += gdImageBlue(im, c); total++; } } /* drawing */ if (total > 0) { c = gdImageColorResolveAlpha(im, r / total, g / total, b / total, a / total); gdImageFilledRectangle(im, x, y, x + block_size - 1, y + block_size - 1, c); } } } break; default: return 0; } return 1; }
int gdImageGetPixel(gdImagePtr im, int x, int y) { if (gdImageBoundsSafe(im, x, y)) { /* NOW ROW-MAJOR IN GD 1.3 */ return im->pixels[y][x]; } else { return 0; } }
void gdImageSetPixel(gdImagePtr im, int x, int y, int color) { int p; switch(color) { case gdStyled: if (!im->style) { /* Refuse to draw if no style is set. */ return; } else { p = im->style[im->stylePos++]; } if (p != (gdTransparent)) { gdImageSetPixel(im, x, y, p); } im->stylePos = im->stylePos % im->styleLength; break; case gdStyledBrushed: if (!im->style) { /* Refuse to draw if no style is set. */ return; } p = im->style[im->stylePos++]; if ((p != gdTransparent) && (p != 0)) { gdImageSetPixel(im, x, y, gdBrushed); } im->stylePos = im->stylePos % im->styleLength; break; case gdBrushed: gdImageBrushApply(im, x, y); break; case gdTiled: gdImageTileApply(im, x, y); break; default: if (gdImageBoundsSafe(im, x, y)) { /* NOW ROW-MAJOR IN GD 1.3 */ im->pixels[y][x] = color; } break; } }