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utils/rescaler: add WebPRescalerGetScaledDimensions

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+ use it in WebPPictureRescale()

Change-Id: I491bea8cd56f0eb1ac8bf0829b9f36c77804219a
This commit is contained in:
James Zern
2015-08-13 20:50:38 -07:00
parent 923e8edafb
commit b918724280
3 changed files with 39 additions and 9 deletions
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28
src/utils/rescaler.c
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@ -50,6 +50,34 @@ void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height,
WebPRescalerDspInit();
}
int WebPRescalerGetScaledDimensions(int src_width, int src_height,
int* const scaled_width,
int* const scaled_height) {
assert(scaled_width != NULL);
assert(scaled_height != NULL);
{
int width = *scaled_width;
int height = *scaled_height;
// if width is unspecified, scale original proportionally to height ratio.
if (width == 0) {
width = (src_width * height + src_height / 2) / src_height;
}
// if height is unspecified, scale original proportionally to width ratio.
if (height == 0) {
height = (src_height * width + src_width / 2) / src_width;
}
// Check if the overall dimensions still make sense.
if (width <= 0 || height <= 0) {
return 0;
}
*scaled_width = width;
*scaled_height = height;
return 1;
}
}
//------------------------------------------------------------------------------
// all-in-one calls