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Handle 16 bit PNG files in sRGB format

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This commit is contained in:
Johan Rastén 2020-07-09 20:59:38 +02:00
parent 006bb33b79
commit e7e632cbed
3 changed files with 10 additions and 4 deletions
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5
drivers/png/image_loader_png.cpp
View file

@ -50,7 +50,7 @@ Error ImageLoaderPNG::load_image(Ref<Image> p_image, FileAccess *f, bool p_force
f->close();
}
const uint8_t *reader = file_buffer.ptr();
return PNGDriverCommon::png_to_image(reader, buffer_size, p_image);
return PNGDriverCommon::png_to_image(reader, buffer_size, p_force_linear, p_image);
}
void ImageLoaderPNG::get_recognized_extensions(List<String> *p_extensions) const {
@ -61,7 +61,8 @@ Ref<Image> ImageLoaderPNG::load_mem_png(const uint8_t *p_png, int p_size) {
Ref<Image> img;
img.instance();
Error err = PNGDriverCommon::png_to_image(p_png, p_size, img);
// the value of p_force_linear does not matter since it only applies to 16 bit
Error err = PNGDriverCommon::png_to_image(p_png, p_size, false, img);
ERR_FAIL_COND_V(err, Ref<Image>());
return img;

7
drivers/png/png_driver_common.cpp
View file

@ -58,7 +58,7 @@ static bool check_error(const png_image &image) {
return false;
}
Error png_to_image(const uint8_t *p_source, size_t p_size, Ref<Image> p_image) {
Error png_to_image(const uint8_t *p_source, size_t p_size, bool p_force_linear, Ref<Image> p_image) {
png_image png_img;
zeromem(&png_img, sizeof(png_img));
png_img.version = PNG_IMAGE_VERSION;
@ -99,6 +99,11 @@ Error png_to_image(const uint8_t *p_source, size_t p_size, Ref<Image> p_image) {
return ERR_UNAVAILABLE;
}
if (!p_force_linear) {
// assume 16 bit pngs without sRGB or gAMA chunks are in sRGB format
png_img.flags |= PNG_IMAGE_FLAG_16BIT_sRGB;
}
const png_uint_32 stride = PNG_IMAGE_ROW_STRIDE(png_img);
Vector<uint8_t> buffer;
Error err = buffer.resize(PNG_IMAGE_BUFFER_SIZE(png_img, stride));

2
drivers/png/png_driver_common.h
View file

@ -36,7 +36,7 @@
namespace PNGDriverCommon {
// Attempt to load png from buffer (p_source, p_size) into p_image
Error png_to_image(const uint8_t *p_source, size_t p_size, Ref<Image> p_image);
Error png_to_image(const uint8_t *p_source, size_t p_size, bool p_force_linear, Ref<Image> p_image);
// Append p_image, as a png, to p_buffer.
// Contents of p_buffer is unspecified if error returned.