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#include "STBDecoder.h"
#include "Exceptions/Exception.h"
#include "stb/stb_image.h"
namespace AsuraEngine
{
namespace Graphics
{
bool STBDecoder::CanDecode(const Filesystem::DataBuffer* buffer)
{
int w = 0;
int h = 0;
int comp = 0;
int status = stbi_info_from_memory((const stbi_uc *)buffer->data, buffer->size, &w, &h, &comp);
return status == 1 && w > 0 && h > 0;
}
void STBDecoder::Decode(const Filesystem::DataBuffer* db, ImageData* imageData)
{
if (!db)
throw Exception("Could not decode image with stb decoder because of null databuffer.");
if (!imageData)
throw Exception("Could not decode image with stb decoder because of null output image data.");
const stbi_uc *buffer = (const stbi_uc *)db->data;
int bufferlen = db->size;
int width, height;
int comp = 0;
byte* data = nullptr;
PixelFormat format = PIXELFORMAT_UNKNOWN;
std::size_t size = 0;
if (stbi_is_hdr_from_memory(buffer, bufferlen))
{
// 4channelfloat
data = (byte*)stbi_loadf_from_memory(buffer, bufferlen, &width, &height, &comp, STBI_rgb_alpha);
format = PIXELFORMAT_RGBA32F;
size = width * height * 4 * sizeof(float);
}
else
{
data = (byte*)stbi_load_from_memory(buffer, bufferlen, &width, &height, &comp, STBI_rgb_alpha);
format = PIXELFORMAT_ASTC_8x5;
size = width * height * 4;
}
if (data)
{
// ֤ڴ汻ͷţһϲûͷŵΪimage dataһԵģimageǶεġ
if (imageData->pixels)
delete[] imageData->pixels;
imageData->pixels = (byte*)data;
imageData->format = format;
imageData->width = width;
imageData->height = height;
}
else
{
const char *err = stbi_failure_reason();
if (err == nullptr)
err = "unknown error";
throw Exception("Could not decode image with stb_image (%s).", err);
}
}
}
}
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