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msvc: disable warning about using setjmp w/c++ objects in scope

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This commit is contained in:
Shawn Hoffman
2017-06-07 04:11:23 -07:00
parent f7f1d5d2ca
commit be7c6a0819
1 changed files with 25 additions and 6 deletions
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31
Source/Core/VideoCommon/ImageWrite.cpp
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@ -21,6 +21,11 @@ bool SaveData(const std::string& filename, const std::string& data)
return true; return true;
} }
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4611)
#endif
/* /*
TextureToPng TextureToPng
@ -31,20 +36,16 @@ row_stride: Determines the amount of bytes per row of pixels.
bool TextureToPng(const u8* data, int row_stride, const std::string& filename, int width, bool TextureToPng(const u8* data, int row_stride, const std::string& filename, int width,
int height, bool saveAlpha) int height, bool saveAlpha)
{ {
bool success = false;
if (!data) if (!data)
return false; return false;
bool success = false;
char title[] = "Dolphin Screenshot"; char title[] = "Dolphin Screenshot";
char title_key[] = "Title"; char title_key[] = "Title";
png_structp png_ptr = nullptr; png_structp png_ptr = nullptr;
png_infop info_ptr = nullptr; png_infop info_ptr = nullptr;
std::vector<u8> buffer; std::vector<u8> buffer;
if (!saveAlpha)
buffer.resize(width * 4);
// Open file for writing (binary mode) // Open file for writing (binary mode)
File::IOFile fp(filename, "wb"); File::IOFile fp(filename, "wb");
if (!fp.IsOpen()) if (!fp.IsOpen())
@ -70,13 +71,22 @@ bool TextureToPng(const u8* data, int row_stride, const std::string& filename, i
goto finalise; goto finalise;
} }
// Setup Exception handling // Classical libpng error handling uses longjmp to do C-style unwind.
// Modern libpng does support a user callback, but it's required to operate
// in the same way (just gives a chance to do stuff before the longjmp).
// Instead of futzing with it, we use gotos specifically so the compiler
// will still generate proper destructor calls for us (hopefully).
// We also do not use any local variables outside the region longjmp may
// have been called from if they were modified inside that region (they
// would need to be volatile).
if (setjmp(png_jmpbuf(png_ptr))) if (setjmp(png_jmpbuf(png_ptr)))
{ {
PanicAlert("Screenshot failed: Error during PNG creation"); PanicAlert("Screenshot failed: Error during PNG creation");
goto finalise; goto finalise;
} }
// Begin region which may call longjmp
png_init_io(png_ptr, fp.GetHandle()); png_init_io(png_ptr, fp.GetHandle());
// Write header (8 bit color depth) // Write header (8 bit color depth)
@ -91,6 +101,9 @@ bool TextureToPng(const u8* data, int row_stride, const std::string& filename, i
png_write_info(png_ptr, info_ptr); png_write_info(png_ptr, info_ptr);
if (!saveAlpha)
buffer.resize(width * 4);
// Write image data // Write image data
for (auto y = 0; y < height; ++y) for (auto y = 0; y < height; ++y)
{ {
@ -114,6 +127,8 @@ bool TextureToPng(const u8* data, int row_stride, const std::string& filename, i
// End write // End write
png_write_end(png_ptr, nullptr); png_write_end(png_ptr, nullptr);
// End region which may call longjmp
success = true; success = true;
finalise: finalise:
@ -124,3 +139,7 @@ finalise:
return success; return success;
} }
#ifdef _MSC_VER
#pragma warning(pop)
#endif