WebPRescalerGetScaledDimensions: round scaled dimension up
This is to prevent resizing to dimension 0
+ added some safety checks about src_width > 0 and src_height > 0
@@ -84,14 +84,14 @@ int WebPRescalerGetScaledDimensions(int src_width, int src_height,
int height = *scaled_height;
// if width is unspecified, scale original proportionally to height ratio.
- if (width == 0) {
+ if (width == 0 && src_height > 0) {
width =
- (int)(((uint64_t)src_width * height + src_height / 2) / src_height);
+ (int)(((uint64_t)src_width * height + src_height - 1) / src_height);
}
// if height is unspecified, scale original proportionally to width ratio.
- if (height == 0) {
+ if (height == 0 && src_width > 0) {
height =
- (int)(((uint64_t)src_height * width + src_width / 2) / src_width);
+ (int)(((uint64_t)src_height * width + src_width - 1) / src_width);
}
// Check if the overall dimensions still make sense.
if (width <= 0 || height <= 0) {
