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image_readers: premultiply alpha

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artemp
2014-11-21 11:28:56 +01:00
parent 1e9b6611cc
commit 4af232dcf3
2 changed files with 2 additions and 1 deletions
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2
include/mbgl/platform/default/png_reader.hpp
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@@ -49,7 +49,7 @@ public:
unsigned width() const;
unsigned height() const;
inline bool has_alpha() const { return has_alpha_; }
bool premultiplied_alpha() const { return false; } //http://www.libpng.org/pub/png/spec/1.1/PNG-Rationale.html
bool premultiplied_alpha() const { return true; } // png_set_alpha_mode(png, PNG_ALPHA_PREMULTIPLIED, 2.2)
void read(unsigned x,unsigned y, unsigned width, unsigned height, char * image);
private:
void init();

1
platform/default/png_reader.cpp
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@@ -157,6 +157,7 @@ void png_reader<T>::read(unsigned x0, unsigned y0, unsigned w, unsigned h, char
double gamma;
if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, 2.2, gamma);
png_set_alpha_mode(png_ptr, PNG_ALPHA_PREMULTIPLIED, 2.2);
if (x0 == 0 && y0 == 0 && w >= width_ && h >= height_)
{