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Common/Image: Add helper for loading from stream

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This commit is contained in:
Connor McLaughlin 2021-01-30 21:36:31 +10:00
parent 3a7d9f1725
commit 0cdd1a70c0
2 changed files with 30 additions and 0 deletions
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27
src/common/image.cpp
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@ -1,4 +1,5 @@
#include "image.h" #include "image.h"
#include "byte_stream.h"
#include "file_system.h" #include "file_system.h"
#include "log.h" #include "log.h"
#include "stb_image.h" #include "stb_image.h"
@ -46,6 +47,32 @@ bool LoadImageFromBuffer(Common::RGBA8Image* image, const void* buffer, std::siz
return true; return true;
} }
bool LoadImageFromStream(RGBA8Image* image, ByteStream* stream)
{
stbi_io_callbacks iocb;
iocb.read = [](void* user, char* data, int size) {
return static_cast<int>(static_cast<ByteStream*>(user)->Read(data, static_cast<u32>(size)));
};
iocb.skip = [](void* user, int n) { static_cast<ByteStream*>(user)->SeekRelative(n); };
iocb.eof = [](void* user) {
ByteStream* stream = static_cast<ByteStream*>(user);
return (stream->InErrorState() || stream->GetPosition() == stream->GetSize()) ? 1 : 0;
};
int width, height, file_channels;
u8* pixel_data = stbi_load_from_callbacks(&iocb, stream, &width, &height, &file_channels, 4);
if (!pixel_data)
{
const char* error_reason = stbi_failure_reason();
Log_ErrorPrintf("Failed to load image from stream: %s", error_reason ? error_reason : "unknown error");
return false;
}
image->SetPixels(static_cast<u32>(width), static_cast<u32>(height), reinterpret_cast<const u32*>(pixel_data));
stbi_image_free(pixel_data);
return true;
}
bool WriteImageToFile(const RGBA8Image& image, const char* filename) bool WriteImageToFile(const RGBA8Image& image, const char* filename)
{ {
const char* extension = std::strrchr(filename, '.'); const char* extension = std::strrchr(filename, '.');

3
src/common/image.h
View file

@ -6,6 +6,8 @@
#include <optional> #include <optional>
#include <vector> #include <vector>
class ByteStream;
namespace Common { namespace Common {
template<typename PixelType> template<typename PixelType>
class Image class Image
@ -94,6 +96,7 @@ using RGBA8Image = Image<u32>;
bool LoadImageFromFile(Common::RGBA8Image* image, const char* filename); bool LoadImageFromFile(Common::RGBA8Image* image, const char* filename);
bool LoadImageFromBuffer(Common::RGBA8Image* image, const void* buffer, std::size_t buffer_size); bool LoadImageFromBuffer(Common::RGBA8Image* image, const void* buffer, std::size_t buffer_size);
bool LoadImageFromStream(Common::RGBA8Image* image, ByteStream* stream);
bool WriteImageToFile(const Common::RGBA8Image& image, const char* filename); bool WriteImageToFile(const Common::RGBA8Image& image, const char* filename);
} // namespace Common } // namespace Common