From fa0559eb710ef6252dea5a70ade28a2c167a7a85 Mon Sep 17 00:00:00 2001 From: =?utf8?q?S=C3=B8ren=20Sandmann=20Pedersen?= Date: Thu, 26 Sep 2013 18:56:07 -0400 Subject: [PATCH] utils.c: Make image_endian_swap() deal with negative strides Use a temporary variable s containing the absolute value of the stride as the upper bound in the inner loops. V2: Do this for the bpp == 16 case as well --- test/utils.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/test/utils.c b/test/utils.c index a83fc06..0cd982e 100644 --- a/test/utils.c +++ b/test/utils.c @@ -297,11 +297,12 @@ image_endian_swap (pixman_image_t *img) for (i = 0; i < height; i++) { uint8_t *line_data = (uint8_t *)data + stride * i; - + int s = (stride >= 0)? stride : - stride; + switch (bpp) { case 1: - for (j = 0; j < stride; j++) + for (j = 0; j < s; j++) { line_data[j] = ((line_data[j] & 0x80) >> 7) | @@ -315,13 +316,13 @@ image_endian_swap (pixman_image_t *img) } break; case 4: - for (j = 0; j < stride; j++) + for (j = 0; j < s; j++) { line_data[j] = (line_data[j] >> 4) | (line_data[j] << 4); } break; case 16: - for (j = 0; j + 2 <= stride; j += 2) + for (j = 0; j + 2 <= s; j += 2) { char t1 = line_data[j + 0]; char t2 = line_data[j + 1]; @@ -331,7 +332,7 @@ image_endian_swap (pixman_image_t *img) } break; case 24: - for (j = 0; j + 3 <= stride; j += 3) + for (j = 0; j + 3 <= s; j += 3) { char t1 = line_data[j + 0]; char t2 = line_data[j + 1]; @@ -343,7 +344,7 @@ image_endian_swap (pixman_image_t *img) } break; case 32: - for (j = 0; j + 4 <= stride; j += 4) + for (j = 0; j + 4 <= s; j += 4) { char t1 = line_data[j + 0]; char t2 = line_data[j + 1]; -- 2.7.4