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Load top-down bmp images correctly

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Previously we handled all sizes as unsigned, but Windows BMP files can have negative height to signal top-down images.
No clue about left-right (would be trivial to swap as well, but found no info so far if that would be correct)

Also casting away some new compile warning in gcc for COBJMeshFileLoader


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6558 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien 2023-10-05 21:04:55 +00:00
parent 099f83c023
commit f06347c8b7
2 changed files with 21 additions and 5 deletions
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24
source/Irrlicht/CImageLoaderBMP.cpp
View File

@ -309,12 +309,25 @@ IImage* CImageLoaderBMP::loadImage(io::IReadFile* file) const
header.ImportantColors = os::Byteswap::byteswap(header.ImportantColors);
#endif
s32 pitch = 0;
//! return if the header is false
if (header.Id != 0x4d42)
bool topDown = false;
if (header.Id == 0x4d42) // BM = Windows header
{
// Sizes are signed integer with Windows header (unsigned with OS/2)
// Not sure if negative Width has any meaning, but negative height is for upside-down
header.Width = core::abs_((s32)header.Width);
if ( (s32)header.Height < 0 )
{
topDown = true;
header.Height = core::abs_((s32)header.Height);
}
}
else
{
os::Printer::log("BMP files with OS/2 Headers not supported.", ELL_ERROR);
return 0;
}
if (header.Compression > 2) // we'll only handle RLE-Compression
{
@ -354,7 +367,7 @@ IImage* CImageLoaderBMP::loadImage(io::IReadFile* file) const
const s32 widthInBytes = core::ceil32(header.Width * (header.BPP / 8.0f));
const s32 lineSize = widthInBytes + ((4-(widthInBytes%4)))%4;
pitch = lineSize - widthInBytes;
const s32 pitch = lineSize - widthInBytes;
u8* bmpData = new u8[header.BitmapDataSize];
file->read(bmpData, header.BitmapDataSize);
@ -435,6 +448,9 @@ cleanup:
delete [] paletteData;
delete [] bmpData;
if ( image && topDown )
image->flip(true, false);
return image;
}

2
source/Irrlicht/COBJMeshFileLoader.cpp
View File

@ -68,7 +68,7 @@ IAnimatedMesh* COBJMeshFileLoader::createMesh(io::IReadFile* file)
if (!file)
return 0;
size_t filesize = file->getSize();
if (filesize == 0 || filesize == -1L)
if (filesize == 0 || filesize == (size_t)-1L)
return 0;
const io::path fullName = file->getFileName();