- add gdImagePaletteToTrueColor

src/gd.c

@@ -3376,3 +3376,71 @@ static void gdImageAALine (gdImagePtr im, int x1, int y1, int x2, int y2, int co
 		}
 	}
 }
+
+
+/* convert a palette image to true color */
+BGD_DECLARE(int) gdImagePaletteToTrueColor(gdImagePtr src)
+{
+	unsigned int y;
+	unsigned char alloc_y = 0, alloc_aa = 0;
+	unsigned int yy;
+
+	if (src == NULL) {
+		return 0;
+	}
+
+	if (src->trueColor == 1) {
+		return 1;
+	} else {
+		unsigned int x;
+		const unsigned int sy = gdImageSY(src);
+		const unsigned int sx = gdImageSX(src);
+
+		src->tpixels = (int **) gdMalloc(sizeof(int *) * sy);
+		if (src->tpixels == NULL) {
+			return 0;
+		}
+
+		for (y = 0; y < sy; y++) {
+			const unsigned char *src_row = src->pixels[y];
+			int * dst_row;
+
+			/* no need to calloc it, we overwrite all pxl anyway */
+			src->tpixels[y] = (int *) gdMalloc(sx * sizeof(int));
+			if (src->tpixels[y] == NULL) {
+				goto clean_on_error;
+			}
+
+			dst_row = src->tpixels[y];
+			for (x = 0; x < sx; x++) {
+				const unsigned char c = *(src_row + x);
+				if (c == src->transparent) {
+					*(dst_row + x) = gdTrueColorAlpha(0, 0, 0, 127);;
+				} else {
+					*(dst_row + x) = gdTrueColorAlpha(src->red[c], src->green[c], src->blue[c], src->alpha[c]);
+				}
+			}
+		}
+	}
+
+	/* free old palette buffer */
+	for (yy = y - 1; yy >= yy - 1; yy--) {
+		gdFree(src->pixels[yy]);
+	}
+	gdFree(src->pixels);
+	src->trueColor = 1;
+	src->pixels = NULL;
+	src->alphaBlendingFlag = 0;
+	src->saveAlphaFlag = 1;
+	return 1;
+
+clean_on_error:
+	if (y > 0) {
+
+		for (yy = y; yy >= yy - 1; y--) {
+			gdFree(src->tpixels[y]);
+		}
+		gdFree(src->tpixels);
+	}
+	return 0;
+}