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resolve bmp alpha channel saving issue

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This commit is contained in:
yyc12345 2023-12-03 20:50:25 +08:00
parent b8b2368ef5
commit 6296261532
1 changed files with 100 additions and 36 deletions
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120
LibCmo/CK2/DataHandlers/CKBitmapHandler.cpp
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@ -9,10 +9,15 @@ namespace LibCmo::CK2::DataHandlers {
/*
ABGR8888 is format used by std image.
The data is placed in buffer with RGBA order, so the format is ABGR.
BGR888 also is non-alpha format used by std image.
The data is placed in buffer with RGB order, so the format is BGR.
ARGB8888 is Virtools standard.
The data is placed in buffer with BGRA order.
*/
// MARK: for std-image size, we use `n * CKSizeof(CKBYTE)` to calc offset.
// for virtools size, we use `VxMath::VxImageDescEx::ColorFactorSize` and `VxMath::VxImageDescEx::PixelSize` to calc offset.
static void ABGRToARGB(CKDWORD count, const void* _abgr, void* _argb) {
const CKBYTE* abgr = static_cast<const CKBYTE*>(_abgr);
CKBYTE* argb = static_cast<CKBYTE*>(_argb);
@ -22,8 +27,8 @@ namespace LibCmo::CK2::DataHandlers {
argb + (2u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
VxMath::VxImageDescEx::ColorFactorSize,
abgr + (0u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
abgr + (0u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE)
);
// copy G
VxMath::VxCopyStructure(
@ -31,8 +36,8 @@ namespace LibCmo::CK2::DataHandlers {
argb + (1u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
VxMath::VxImageDescEx::ColorFactorSize,
abgr + (1u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
abgr + (1u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE)
);
// copy B
VxMath::VxCopyStructure(
@ -40,8 +45,8 @@ namespace LibCmo::CK2::DataHandlers {
argb + (0u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
VxMath::VxImageDescEx::ColorFactorSize,
abgr + (2u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
abgr + (2u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE)
);
// copy A
VxMath::VxCopyStructure(
@ -49,8 +54,8 @@ namespace LibCmo::CK2::DataHandlers {
argb + (3u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
VxMath::VxImageDescEx::ColorFactorSize,
abgr + (3u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
abgr + (3u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE)
);
}
@ -60,8 +65,8 @@ namespace LibCmo::CK2::DataHandlers {
// copy R
VxMath::VxCopyStructure(
count,
abgr + (0u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
abgr + (0u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (2u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
@ -69,8 +74,8 @@ namespace LibCmo::CK2::DataHandlers {
// copy G
VxMath::VxCopyStructure(
count,
abgr + (1u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
abgr + (1u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (1u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
@ -78,8 +83,8 @@ namespace LibCmo::CK2::DataHandlers {
// copy B
VxMath::VxCopyStructure(
count,
abgr + (2u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
abgr + (2u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (0u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
@ -87,14 +92,47 @@ namespace LibCmo::CK2::DataHandlers {
// copy A
VxMath::VxCopyStructure(
count,
abgr + (3u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize,
abgr + (3u * CKSizeof(CKBYTE)),
4u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (3u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
);
}
static void ARGBToBGR(CKDWORD count, const void* _argb, void* _bgr) {
const CKBYTE* argb = static_cast<const CKBYTE*>(_argb);
CKBYTE* bgr = static_cast<CKBYTE*>(_bgr);
// copy R
VxMath::VxCopyStructure(
count,
bgr + (0u * CKSizeof(CKBYTE)),
3u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (2u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
);
// copy G
VxMath::VxCopyStructure(
count,
bgr + (1u * CKSizeof(CKBYTE)),
3u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (1u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
);
// copy B
VxMath::VxCopyStructure(
count,
bgr + (2u * CKSizeof(CKBYTE)),
3u * CKSizeof(CKBYTE),
VxMath::VxImageDescEx::ColorFactorSize,
argb + (0u * VxMath::VxImageDescEx::ColorFactorSize),
VxMath::VxImageDescEx::PixelSize
);
// skip A factor
}
static bool StbReadFile(CKSTRING u8filename, VxMath::VxImageDescEx* read_image) {
if (u8filename == nullptr || read_image == nullptr) return false;
FILE* fs = EncodingHelper::U8FOpen(u8filename, "rb");
@ -169,22 +207,33 @@ namespace LibCmo::CK2::DataHandlers {
}
using SaveOperation = std::function<int(stbi_write_func*, void*, int, int, int, const void*)>;
static bool StbSaveFile(CKSTRING u8filename, const VxMath::VxImageDescEx* write_image, SaveOperation oper) {
static bool StbSaveFile(CKSTRING u8filename, const VxMath::VxImageDescEx* write_image, bool save_alpha, SaveOperation oper) {
if (u8filename == nullptr || write_image == nullptr) return false;
if (!write_image->IsValid()) return false;
FILE* fs = EncodingHelper::U8FOpen(u8filename, "wb");
if (fs == nullptr) return false;
// allocate buffer and convert data from ARGB to RGBA
CKBYTE* data = new CKBYTE[write_image->GetImageSize()];
// allocate buffer and convert data from ARGB to RGBA or RGB
CKBYTE* data = nullptr;
int channel_count = 0;
if (save_alpha) {
// save with alpha
data = new CKBYTE[CKSizeof(CKBYTE) * 4u * write_image->GetWidth() * write_image->GetHeight()];
ARGBToABGR(write_image->GetPixelCount(), write_image->GetImage(), data);
channel_count = 4;
} else {
// save without alpha
data = new CKBYTE[CKSizeof(CKBYTE) * 3u * write_image->GetWidth() * write_image->GetHeight()];
ARGBToBGR(write_image->GetPixelCount(), write_image->GetImage(), data);
channel_count = 3;
}
// write data
FileSaveContext* ctx = new FileSaveContext(fs);
int ret = oper(
&FileWriteFunction, ctx,
static_cast<int>(write_image->GetWidth()), static_cast<int>(write_image->GetHeight()),
4, data // 4 == RGBA8888
channel_count, data // 4 == RGBA8888
);
// free data
@ -195,20 +244,31 @@ namespace LibCmo::CK2::DataHandlers {
// ret is 0 mean failed.
return ret != 0;
}
static CKDWORD StbSaveMemory(void* memory, const VxMath::VxImageDescEx* write_image, SaveOperation oper) {
static CKDWORD StbSaveMemory(void* memory, const VxMath::VxImageDescEx* write_image, bool save_alpha, SaveOperation oper) {
if (write_image == nullptr) return 0;
if (!write_image->IsValid()) return 0;
// allocate buffer and convert data from ARGB to RGBA
CKBYTE* data = new CKBYTE[write_image->GetImageSize()];
// allocate buffer and convert data from ARGB to RGBA or RGB
CKBYTE* data = nullptr;
int channel_count = 0;
if (save_alpha) {
// save with alpha
data = new CKBYTE[CKSizeof(CKBYTE) * 4u * write_image->GetWidth() * write_image->GetHeight()];
ARGBToABGR(write_image->GetPixelCount(), write_image->GetImage(), data);
channel_count = 4;
} else {
// save without alpha
data = new CKBYTE[CKSizeof(CKBYTE) * 3u * write_image->GetWidth() * write_image->GetHeight()];
ARGBToBGR(write_image->GetPixelCount(), write_image->GetImage(), data);
channel_count = 3;
}
// write data
MemorySaveContext* ctx = new MemorySaveContext(memory);
int ret = oper(
&MemoryWriteFunction, ctx,
static_cast<int>(write_image->GetWidth()), static_cast<int>(write_image->GetHeight()),
4, data // 4 == RGBA8888
channel_count, data // 4 == RGBA8888
);
// free data
@ -244,15 +304,19 @@ namespace LibCmo::CK2::DataHandlers {
return StbReadMemory(memory, size, read_image);
}
// MARK: when stb-image writing bmp file with alpha channel, it will create a very rare bmp file supporting alpha channel.
// this format is not supported by virtools and will result blank image.
// so we create an alpha option to forcely change channel count to 3 (RGB) then the bmp writer can work normally.
bool CKBitmapBMPHandler::SaveFile(CKSTRING u8filename, const VxMath::VxImageDescEx* write_image, const CKBitmapProperties& codec_param) {
return StbSaveFile(u8filename, write_image,
return StbSaveFile(u8filename, write_image, false, // bmp do not support alpha
[&codec_param](stbi_write_func* func, void* context, int w, int h, int comp, const void* data) -> int {
return stbi_write_bmp_to_func(func, context, w, h, comp, data);
});
}
CKDWORD CKBitmapBMPHandler::SaveMemory(void* memory, const VxMath::VxImageDescEx* write_image, const CKBitmapProperties& codec_param) {
return StbSaveMemory(memory, write_image,
return StbSaveMemory(memory, write_image, false, // bmp do not support alpha
[&codec_param](stbi_write_func* func, void* context, int w, int h, int comp, const void* data) -> int {
return stbi_write_bmp_to_func(func, context, w, h, comp, data);
});
@ -286,14 +350,14 @@ namespace LibCmo::CK2::DataHandlers {
}
bool CKBitmapTGAHandler::SaveFile(CKSTRING u8filename, const VxMath::VxImageDescEx* write_image, const CKBitmapProperties& codec_param) {
return StbSaveFile(u8filename, write_image,
return StbSaveFile(u8filename, write_image, false, // tga support alpha
[&codec_param](stbi_write_func* func, void* context, int w, int h, int comp, const void* data) -> int {
return stbi_write_tga_to_func(func, context, w, h, comp, data);
});
}
CKDWORD CKBitmapTGAHandler::SaveMemory(void* memory, const VxMath::VxImageDescEx* write_image, const CKBitmapProperties& codec_param) {
return StbSaveMemory(memory, write_image,
return StbSaveMemory(memory, write_image, false, // tga support alpha
[&codec_param](stbi_write_func* func, void* context, int w, int h, int comp, const void* data) -> int {
return stbi_write_tga_to_func(func, context, w, h, comp, data);
});