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Initial support of loading 16bit PNG using lodepng.

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This commit is contained in:
Syoyo Fujita 2019-01-07 02:27:28 +09:00
parent cbf13fef62
commit ab069ffb40
1 changed files with 31 additions and 4 deletions
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35
tiny_gltf.h
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@ -477,8 +477,10 @@ struct Image {
std::string name;
int width;
int height;
int component;
std::vector<unsigned char> image;
int component; // channels. e.g. RGB=3, RGBA=4
int bits; // bit depth per channel. 8(byte), 16 or 32.
int pixel_type; // pixel type(TINYGLTF_COMPONENT_TYPE_***). usually UBYTE(bits = 8) or USHORT(bits = 16)
std::vector<unsigned char> image; // width * height * component * (bits/8)
int bufferView; // (required if no uri)
std::string mimeType; // (required if no uri) ["image/jpeg", "image/png",
// "image/bmp", "image/gif"]
@ -499,6 +501,8 @@ struct Image {
width = -1;
height = -1;
component = -1;
bits = -1;
pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;
}
bool operator==(const Image &) const;
};
@ -1208,6 +1212,7 @@ bool Camera::operator==(const Camera &other) const {
bool Image::operator==(const Image &other) const {
return this->bufferView == other.bufferView &&
this->component == other.component && this->extras == other.extras &&
this->bits == other.bits &&
this->height == other.height && this->image == other.image &&
this->mimeType == other.mimeType && this->name == other.name &&
this->uri == other.uri && this->width == other.width;
@ -1604,6 +1609,9 @@ bool LoadImageData(Image *image, const int image_idx, std::string *err, std::str
// some GPU drivers do not support 24-bit images for Vulkan
req_comp = 4;
int bits = 8;
int pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;
// if image cannot be decoded, ignore parsing and keep it by its path
// don't break in this case
// FIXME we should only enter this function if the image is embedded. If
@ -1613,11 +1621,28 @@ bool LoadImageData(Image *image, const int image_idx, std::string *err, std::str
unsigned char *data =
stbi_load_from_memory(bytes, size, &w, &h, &comp, req_comp);
if (!data) {
#if !defined(TINYGLTF_NO_LODEPNG)
// try to load as 16bit PNG RGBA
unsigned ret = lodepng_decode_memory(&data, reinterpret_cast<unsigned *>(&w), reinterpret_cast<unsigned *>(&h), bytes, size, LCT_RGBA, /* bitdepth*/16);
if (ret != 0) {
// NOTE: you can use `warn` instead of `err`
if (err) {
(*err) += "Unknown image format. STB and LodePNG cannot decode image data for image[" + std::to_string(image_idx) + "] name = \"" + image->name + "\".\n";
}
return false;
}
bits = 16;
pixel_type = TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT;
#else
// NOTE: you can use `warn` instead of `err`
if (err) {
(*err) += "Unknown image format. STB cannot decode image data for image[" + std::to_string(image_idx) + "] name = \"" + image->name + "\". Proably 16bit PNG?\n";
}
return false;
#endif
}
if (w < 1 || h < 1) {
@ -1651,8 +1676,10 @@ bool LoadImageData(Image *image, const int image_idx, std::string *err, std::str
image->width = w;
image->height = h;
image->component = req_comp;
image->image.resize(static_cast<size_t>(w * h * req_comp));
std::copy(data, data + w * h * req_comp, image->image.begin());
image->bits = bits;
image->pixel_type = pixel_type;
image->image.resize(static_cast<size_t>(w * h * req_comp * (bits/8)));
std::copy(data, data + w * h * req_comp * (bits/8), image->image.begin());
free(data);