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Skip normalise operation for images with one colour

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It didn't play nicely with premultiplication
This commit is contained in:
Lovell Fuller
2015-05-20 20:07:32 +01:00
parent d2a2654ace
commit f19b6c48ca
3 changed files with 25 additions and 63 deletions
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17
src/composite.c
View File

@@ -128,11 +128,6 @@ int Composite(VipsObject *context, VipsImage *srcPremultiplied, VipsImage *dstPr
int Premultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
VipsImage *imagePremultiplied;
// Trivial case: Copy images without alpha channel:
if (!HasAlpha(image)) {
return vips_image_write(image, *out);
}
#if (VIPS_MAJOR_VERSION >= 9 || (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 1))
if (vips_premultiply(image, &imagePremultiplied, NULL))
@@ -140,9 +135,6 @@ int Premultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
#else
if (image->Bands != 4)
return -1;
VipsImage *imageRGB;
if (vips_extract_band(image, &imageRGB, 0, "n", NUM_COLOR_BANDS, NULL))
return -1;
@@ -181,11 +173,6 @@ int Premultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
int Unpremultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
VipsImage *imageUnpremultiplied;
// Trivial case: Copy images without alpha channel:
if (!HasAlpha(image)) {
return vips_image_write(image, *out);
}
#if (VIPS_MAJOR_VERSION >= 9 || (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 1))
if (vips_unpremultiply(image, &imageUnpremultiplied, NULL))
@@ -193,9 +180,6 @@ int Unpremultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
#else
if (image->Bands != 4)
return -1;
VipsImage *imageRGBPremultipliedTransformed;
if (vips_extract_band(image, &imageRGBPremultipliedTransformed, 0, "n", NUM_COLOR_BANDS, NULL))
return -1;
@@ -219,7 +203,6 @@ int Unpremultiply(VipsObject *context, VipsImage *image, VipsImage **out) {
if (vips_bandjoin2(imageRGBUnpremultipliedTransformed, imageAlphaTransformed, &imageUnpremultiplied, NULL))
return -1;
#endif
// Return a reference to the unpremultiplied output image:

41
src/resize.cc
View File

@@ -763,17 +763,10 @@ class ResizeWorker : public NanAsyncWorker {
return Error();
}
vips_object_local(hook, stats);
double min = *VIPS_MATRIX(stats, 0, 0);
double max = *VIPS_MATRIX(stats, 1, 0);
VipsImage *normalized;
if (min == max) {
// Range of zero: create black image
if (vips_black(&normalized, image->Xsize, image->Ysize, "bands", 1, NULL )) {
return Error();
}
vips_object_local(hook, normalized);
} else {
if (min != max) {
double f = 100.0 / (max - min);
double a = -(min * f);
@@ -788,27 +781,29 @@ class ResizeWorker : public NanAsyncWorker {
return Error();
}
vips_object_local(hook, normalizedLab);
VipsImage *normalized;
if (vips_colourspace(normalizedLab, &normalized, typeBeforeNormalize, NULL)) {
return Error();
}
vips_object_local(hook, normalized);
}
if (HasAlpha(image)) {
VipsImage *alpha;
if (vips_extract_band(image, &alpha, image->Bands - 1, "n", 1, NULL)) {
return Error();
}
vips_object_local(hook, alpha);
if (HasAlpha(image)) {
VipsImage *alpha;
if (vips_extract_band(image, &alpha, image->Bands - 1, "n", 1, NULL)) {
return Error();
}
vips_object_local(hook, alpha);
VipsImage *normalizedAlpha;
if (vips_bandjoin2(normalized, alpha, &normalizedAlpha, NULL)) {
return Error();
VipsImage *normalizedAlpha;
if (vips_bandjoin2(normalized, alpha, &normalizedAlpha, NULL)) {
return Error();
}
vips_object_local(hook, normalizedAlpha);
image = normalizedAlpha;
} else {
image = normalized;
}
vips_object_local(hook, normalizedAlpha);
image = normalizedAlpha;
} else {
image = normalized;
}
}
#endif