ddnet/src/engine/gfx/image_loader.cpp

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#include "image_loader.h"
#include <base/log.h>
#include <base/system.h>
#include <csetjmp>
#include <cstdlib>
#include <png.h>
struct SLibPNGWarningItem
{
SImageByteBuffer *m_pByteLoader;
const char *m_pFileName;
std::jmp_buf m_Buf;
};
[[noreturn]] static void LibPNGError(png_structp png_ptr, png_const_charp error_msg)
{
SLibPNGWarningItem *pUserStruct = (SLibPNGWarningItem *)png_get_error_ptr(png_ptr);
pUserStruct->m_pByteLoader->m_Err = -1;
dbg_msg("libpng", "error for file \"%s\": %s", pUserStruct->m_pFileName, error_msg);
std::longjmp(pUserStruct->m_Buf, 1);
}
static void LibPNGWarning(png_structp png_ptr, png_const_charp warning_msg)
{
SLibPNGWarningItem *pUserStruct = (SLibPNGWarningItem *)png_get_error_ptr(png_ptr);
dbg_msg("libpng", "warning for file \"%s\": %s", pUserStruct->m_pFileName, warning_msg);
}
static bool FileMatchesImageType(SImageByteBuffer &ByteLoader)
{
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if(ByteLoader.m_pvLoadedImageBytes->size() >= 8)
return png_sig_cmp((png_bytep)ByteLoader.m_pvLoadedImageBytes->data(), 0, 8) == 0;
return false;
}
static void ReadDataFromLoadedBytes(png_structp pPNGStruct, png_bytep pOutBytes, png_size_t ByteCountToRead)
{
png_voidp pIO_Ptr = png_get_io_ptr(pPNGStruct);
SImageByteBuffer *pByteLoader = (SImageByteBuffer *)pIO_Ptr;
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if(pByteLoader->m_pvLoadedImageBytes->size() >= pByteLoader->m_LoadOffset + (size_t)ByteCountToRead)
{
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mem_copy(pOutBytes, &(*pByteLoader->m_pvLoadedImageBytes)[pByteLoader->m_LoadOffset], (size_t)ByteCountToRead);
pByteLoader->m_LoadOffset += (size_t)ByteCountToRead;
}
else
{
pByteLoader->m_Err = -1;
dbg_msg("png", "could not read bytes, file was too small.");
}
}
static int LibPNGGetColorChannelCount(int LibPNGColorType)
{
if(LibPNGColorType == PNG_COLOR_TYPE_GRAY)
return 1;
else if(LibPNGColorType == PNG_COLOR_TYPE_PALETTE || LibPNGColorType == PNG_COLOR_TYPE_RGB)
return 3;
else if(LibPNGColorType == PNG_COLOR_TYPE_RGBA)
return 4;
return 4;
}
static void LibPNGSetImageFormat(EImageFormat &ImageFormat, int LibPNGColorType)
{
ImageFormat = IMAGE_FORMAT_RGBA;
if(LibPNGColorType == PNG_COLOR_TYPE_GRAY)
ImageFormat = IMAGE_FORMAT_R;
else if(LibPNGColorType == PNG_COLOR_TYPE_PALETTE || LibPNGColorType == PNG_COLOR_TYPE_RGB)
ImageFormat = IMAGE_FORMAT_RGB;
else if(LibPNGColorType == PNG_COLOR_TYPE_RGBA)
ImageFormat = IMAGE_FORMAT_RGBA;
}
static void LibPNGDeleteReadStruct(png_structp pPNGStruct, png_infop pPNGInfo)
{
if(pPNGInfo != nullptr)
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
}
static int PngliteIncompatibility(png_structp pPNGStruct, png_infop pPNGInfo)
{
int ColorType = png_get_color_type(pPNGStruct, pPNGInfo);
int BitDepth = png_get_bit_depth(pPNGStruct, pPNGInfo);
int InterlaceType = png_get_interlace_type(pPNGStruct, pPNGInfo);
int Result = 0;
switch(ColorType)
{
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
case PNG_COLOR_TYPE_GRAY_ALPHA:
break;
default:
log_debug("png", "color type %d unsupported by pnglite", ColorType);
Result |= PNGLITE_COLOR_TYPE;
}
switch(BitDepth)
{
case 8:
case 16:
break;
default:
log_debug("png", "bit depth %d unsupported by pnglite", BitDepth);
Result |= PNGLITE_BIT_DEPTH;
}
if(InterlaceType != PNG_INTERLACE_NONE)
{
log_debug("png", "interlace type %d unsupported by pnglite", InterlaceType);
Result |= PNGLITE_INTERLACE_TYPE;
}
if(png_get_compression_type(pPNGStruct, pPNGInfo) != PNG_COMPRESSION_TYPE_BASE)
{
log_debug("png", "non-default compression type unsupported by pnglite");
Result |= PNGLITE_COMPRESSION_TYPE;
}
if(png_get_filter_type(pPNGStruct, pPNGInfo) != PNG_FILTER_TYPE_BASE)
{
log_debug("png", "non-default filter type unsupported by pnglite");
Result |= PNGLITE_FILTER_TYPE;
}
return Result;
}
bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIncompatible, int &Width, int &Height, uint8_t *&pImageBuff, EImageFormat &ImageFormat)
{
png_infop pPNGInfo = nullptr;
int ColorType;
png_byte BitDepth;
int ColorChannelCount;
int BytesInRow;
Height = 0;
png_bytepp pRowPointers = nullptr;
SLibPNGWarningItem UserErrorStruct = {&ByteLoader, pFileName, {}};
png_structp pPNGStruct = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(pPNGStruct == NULL)
{
dbg_msg("png", "libpng internal failure: png_create_read_struct failed.");
return false;
}
if(setjmp(UserErrorStruct.m_Buf))
{
if(pRowPointers != nullptr)
{
for(int i = 0; i < Height; ++i)
{
delete[] pRowPointers[i];
}
}
delete[] pRowPointers;
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
png_set_error_fn(pPNGStruct, &UserErrorStruct, LibPNGError, LibPNGWarning);
pPNGInfo = png_create_info_struct(pPNGStruct);
if(pPNGInfo == NULL)
{
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
dbg_msg("png", "libpng internal failure: png_create_info_struct failed.");
return false;
}
if(!FileMatchesImageType(ByteLoader))
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
ByteLoader.m_LoadOffset = 8;
png_set_read_fn(pPNGStruct, (png_bytep)&ByteLoader, ReadDataFromLoadedBytes);
png_set_sig_bytes(pPNGStruct, 8);
png_read_info(pPNGStruct, pPNGInfo);
if(ByteLoader.m_Err != 0)
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
Width = png_get_image_width(pPNGStruct, pPNGInfo);
Height = png_get_image_height(pPNGStruct, pPNGInfo);
ColorType = png_get_color_type(pPNGStruct, pPNGInfo);
BitDepth = png_get_bit_depth(pPNGStruct, pPNGInfo);
PngliteIncompatible = PngliteIncompatibility(pPNGStruct, pPNGInfo);
if(BitDepth == 16)
{
png_set_strip_16(pPNGStruct);
}
else if(BitDepth > 8)
{
dbg_msg("png", "non supported bit depth.");
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
if(Width == 0 || Height == 0 || BitDepth == 0)
{
dbg_msg("png", "image had width, height or bit depth of 0.");
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
if(ColorType == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(pPNGStruct);
if(ColorType == PNG_COLOR_TYPE_GRAY && BitDepth < 8)
png_set_expand_gray_1_2_4_to_8(pPNGStruct);
if(png_get_valid(pPNGStruct, pPNGInfo, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(pPNGStruct);
png_read_update_info(pPNGStruct, pPNGInfo);
ColorChannelCount = LibPNGGetColorChannelCount(ColorType);
BytesInRow = png_get_rowbytes(pPNGStruct, pPNGInfo);
if(BytesInRow == Width * ColorChannelCount)
{
pRowPointers = new png_bytep[Height];
for(int y = 0; y < Height; ++y)
{
pRowPointers[y] = new png_byte[BytesInRow];
}
png_read_image(pPNGStruct, pRowPointers);
if(ByteLoader.m_Err == 0)
pImageBuff = (uint8_t *)malloc((size_t)Height * (size_t)Width * (size_t)ColorChannelCount * sizeof(uint8_t));
for(int i = 0; i < Height; ++i)
{
if(ByteLoader.m_Err == 0)
mem_copy(&pImageBuff[i * BytesInRow], pRowPointers[i], BytesInRow);
delete[] pRowPointers[i];
}
delete[] pRowPointers;
pRowPointers = nullptr;
if(ByteLoader.m_Err != 0)
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
LibPNGSetImageFormat(ImageFormat, ColorType);
}
else
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
return false;
}
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
return true;
}
static void WriteDataFromLoadedBytes(png_structp pPNGStruct, png_bytep pOutBytes, png_size_t ByteCountToWrite)
{
if(ByteCountToWrite > 0)
{
png_voidp pIO_Ptr = png_get_io_ptr(pPNGStruct);
SImageByteBuffer *pByteLoader = (SImageByteBuffer *)pIO_Ptr;
size_t NewSize = pByteLoader->m_LoadOffset + (size_t)ByteCountToWrite;
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pByteLoader->m_pvLoadedImageBytes->resize(NewSize);
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mem_copy(&(*pByteLoader->m_pvLoadedImageBytes)[pByteLoader->m_LoadOffset], pOutBytes, (size_t)ByteCountToWrite);
pByteLoader->m_LoadOffset = NewSize;
}
}
static void FlushPNGWrite(png_structp png_ptr) {}
static int ImageLoaderHelperFormatToColorChannel(EImageFormat Format)
{
if(Format == IMAGE_FORMAT_R)
return 1;
else if(Format == IMAGE_FORMAT_RGB)
return 3;
else if(Format == IMAGE_FORMAT_RGBA)
return 4;
return 4;
}
bool SavePNG(EImageFormat ImageFormat, const uint8_t *pRawBuffer, SImageByteBuffer &WrittenBytes, int Width, int Height)
{
png_structp pPNGStruct = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(pPNGStruct == NULL)
{
dbg_msg("png", "libpng internal failure: png_create_write_struct failed.");
return false;
}
png_infop pPNGInfo = png_create_info_struct(pPNGStruct);
if(pPNGInfo == NULL)
{
png_destroy_read_struct(&pPNGStruct, NULL, NULL);
dbg_msg("png", "libpng internal failure: png_create_info_struct failed.");
return false;
}
WrittenBytes.m_LoadOffset = 0;
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WrittenBytes.m_pvLoadedImageBytes->clear();
png_set_write_fn(pPNGStruct, (png_bytep)&WrittenBytes, WriteDataFromLoadedBytes, FlushPNGWrite);
int ColorType = PNG_COLOR_TYPE_RGB;
int WriteBytesPerPixel = ImageLoaderHelperFormatToColorChannel(ImageFormat);
if(ImageFormat == IMAGE_FORMAT_R)
{
ColorType = PNG_COLOR_TYPE_GRAY;
}
else if(ImageFormat == IMAGE_FORMAT_RGBA)
{
ColorType = PNG_COLOR_TYPE_RGBA;
}
png_set_IHDR(pPNGStruct, pPNGInfo, Width, Height, 8, ColorType, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(pPNGStruct, pPNGInfo);
png_bytepp pRowPointers = new png_bytep[Height];
int WidthBytes = Width * WriteBytesPerPixel;
ptrdiff_t BufferOffset = 0;
for(int y = 0; y < Height; ++y)
{
pRowPointers[y] = new png_byte[WidthBytes];
mem_copy(pRowPointers[y], pRawBuffer + BufferOffset, WidthBytes);
BufferOffset += (ptrdiff_t)WidthBytes;
}
png_write_image(pPNGStruct, pRowPointers);
png_write_end(pPNGStruct, pPNGInfo);
for(int y = 0; y < Height; ++y)
{
delete[](pRowPointers[y]);
}
delete[](pRowPointers);
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_write_struct(&pPNGStruct, NULL);
return true;
}