From b309f645f9e7c2f1f50691dead6a85a56da8333f Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Fri, 2 Feb 2018 17:39:23 +0100
Subject: [PATCH] Sync gdImageCrop() with upstream

Besides that we still hope to sync the complete bundled libgd sometime,
the upstream implementation of `gdImageCrop()` is much simpler than the
current one, and thus better readable and less error prone.
---
 ext/gd/libgd/gd_crop.c | 50 ++++++------------------------------------
 1 file changed, 7 insertions(+), 43 deletions(-)

diff --git a/ext/gd/libgd/gd_crop.c b/ext/gd/libgd/gd_crop.c
index 58b630317d..74d86669f5 100644
--- a/ext/gd/libgd/gd_crop.c
+++ b/ext/gd/libgd/gd_crop.c
@@ -43,55 +43,19 @@ static int gdColorMatch(gdImagePtr im, int col1, int col2, float threshold);
 gdImagePtr gdImageCrop(gdImagePtr src, const gdRectPtr crop)
 {
 	gdImagePtr dst;
-	int y;
+	int alphaBlendingFlag;
 
-	/* allocate the requested size (could be only partially filled) */
-	if (src->trueColor) {
+	if (gdImageTrueColor(src)) {
 		dst = gdImageCreateTrueColor(crop->width, crop->height);
-		if (dst == NULL) {
-			return NULL;
-		}
-		gdImageSaveAlpha(dst, 1);
 	} else {
 		dst = gdImageCreate(crop->width, crop->height);
-		if (dst == NULL) {
-			return NULL;
-		}
-		gdImagePaletteCopy(dst, src);
-	}
-	dst->transparent = src->transparent;
-
-	/* check position in the src image */
-	if (crop->x < 0 || crop->x>=src->sx || crop->y<0 || crop->y>=src->sy) {
-		return dst;
-	}
-
-	/* reduce size if needed */
-	if ((src->sx - crop->width) < crop->x) {
-		crop->width = src->sx - crop->x;
-	}
-	if ((src->sy - crop->height) < crop->y) {
-		crop->height = src->sy - crop->y;
 	}
+	if (!dst) return NULL;
+	alphaBlendingFlag = dst->alphaBlendingFlag;
+	gdImageAlphaBlending(dst, gdEffectReplace);
+	gdImageCopy(dst, src, 0, 0, crop->x, crop->y, crop->width, crop->height);
+	gdImageAlphaBlending(dst, alphaBlendingFlag);
 
-#if 0
-printf("rect->x: %i\nrect->y: %i\nrect->width: %i\nrect->height: %i\n", crop->x, crop->y, crop->width, crop->height);
-#endif
-	y = crop->y;
-	if (src->trueColor) {
-		unsigned int dst_y = 0;
-		while (y < (crop->y + crop->height)) {
-			/* TODO: replace 4 w/byte per channel||pitch once available */
-			memcpy(dst->tpixels[dst_y++], src->tpixels[y++] + crop->x, crop->width * 4);
-		}
-	} else {
-		int x;
-		for (y = crop->y; y < (crop->y + crop->height); y++) {
-			for (x = crop->x; x < (crop->x + crop->width); x++) {
-				dst->pixels[y - crop->y][x - crop->x] = src->pixels[y][x];
-			}
-		}
-	}
 	return dst;
 }
 
-- 
2.50.1