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https://gitea.wildfiregames.com/0ad/0ad
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c0ed950657
this snowballed into a massive search+destroy of the hodgepodge of mostly equivalent types we had in use (int, uint, unsigned, unsigned int, i32, u32, ulong, uintN). it is more efficient to use 64-bit types in 64-bit mode, so the preferred default is size_t (for anything remotely resembling a size or index). tile coordinates are ssize_t to allow more efficient conversion to/from floating point. flags are int because we almost never need more than 15 distinct bits, bit test/set is not slower and int is fastest to type. finally, some data that is pretty much directly passed to OpenGL is now typed accordingly. after several hours, the code now requires fewer casts and less guesswork. other changes: - unit and player IDs now have an "invalid id" constant in the respective class to avoid casting and -1 - fix some endian/64-bit bugs in the map (un)packing. added a convenience function to write/read a size_t. - ia32: change CPUID interface to allow passing in ecx (required for cache topology detection, which I need at work). remove some unneeded functions from asm, replace with intrinsics where possible. This was SVN commit r5942.
145 lines
3.2 KiB
C++
145 lines
3.2 KiB
C++
/**
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* =========================================================================
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* File : tex_bmp.cpp
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* Project : 0 A.D.
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* Description : Windows BMP codec
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "lib/byte_order.h"
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#include "tex_codec.h"
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#pragma pack(push, 1)
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struct BmpHeader
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{
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// BITMAPFILEHEADER
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u16 bfType; // "BM"
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u32 bfSize; // of file
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u16 bfReserved1;
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u16 bfReserved2;
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u32 bfOffBits; // offset to image data
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// BITMAPINFOHEADER
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u32 biSize;
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long biWidth;
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long biHeight;
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u16 biPlanes;
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u16 biBitCount;
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u32 biCompression;
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u32 biSizeImage;
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// the following are unused and zeroed when writing:
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long biXPelsPerMeter;
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long biYPelsPerMeter;
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u32 biClrUsed;
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u32 biClrImportant;
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};
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#pragma pack(pop)
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#define BI_RGB 0 // biCompression
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static LibError bmp_transform(Tex* UNUSED(t), size_t UNUSED(transforms))
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{
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return INFO::TEX_CODEC_CANNOT_HANDLE;
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}
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static bool bmp_is_hdr(const u8* file)
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{
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// check header signature (bfType == "BM"?).
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// we compare single bytes to be endian-safe.
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return (file[0] == 'B' && file[1] == 'M');
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}
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static bool bmp_is_ext(const std::string& extension)
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{
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return !strcasecmp(extension.c_str(), ".bmp");
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}
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static size_t bmp_hdr_size(const u8* file)
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{
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const size_t hdr_size = sizeof(BmpHeader);
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if(file)
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{
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BmpHeader* hdr = (BmpHeader*)file;
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const u32 ofs = read_le32(&hdr->bfOffBits);
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debug_assert(ofs >= hdr_size && "bmp_hdr_size invalid");
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return ofs;
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}
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return hdr_size;
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}
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// requirements: uncompressed, direct colour, bottom up
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static LibError bmp_decode(DynArray* RESTRICT da, Tex* RESTRICT t)
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{
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u8* file = da->base;
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const BmpHeader* hdr = (const BmpHeader*)file;
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const long w = (long)read_le32(&hdr->biWidth);
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const long h_ = (long)read_le32(&hdr->biHeight);
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const u16 bpp = read_le16(&hdr->biBitCount);
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const u32 compress = read_le32(&hdr->biCompression);
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const long h = abs(h_);
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int flags = 0;
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flags |= (h_ < 0)? TEX_TOP_DOWN : TEX_BOTTOM_UP;
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if(bpp > 16)
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flags |= TEX_BGR;
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if(bpp == 32)
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flags |= TEX_ALPHA;
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// sanity checks
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if(compress != BI_RGB)
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WARN_RETURN(ERR::TEX_COMPRESSED);
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t->w = w;
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t->h = h;
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t->bpp = bpp;
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t->flags = flags;
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return INFO::OK;
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}
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static LibError bmp_encode(Tex* RESTRICT t, DynArray* RESTRICT da)
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{
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const size_t hdr_size = sizeof(BmpHeader); // needed for BITMAPFILEHEADER
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const size_t img_size = tex_img_size(t);
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const size_t file_size = hdr_size + img_size;
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const long h = (t->flags & TEX_TOP_DOWN)? -(long)t->h : t->h;
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int transforms = t->flags;
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transforms &= ~TEX_ORIENTATION; // no flip needed - we can set top-down bit.
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transforms ^= TEX_BGR; // BMP is native BGR.
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const BmpHeader hdr =
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{
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// BITMAPFILEHEADER
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0x4D42, // bfType = 'B','M'
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(u32)file_size, // bfSize
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0, 0, // bfReserved1,2
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hdr_size, // bfOffBits
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// BITMAPINFOHEADER
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40, // biSize = sizeof(BITMAPINFOHEADER)
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t->w,
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h,
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1, // biPlanes
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t->bpp,
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BI_RGB, // biCompression
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(u32)img_size, // biSizeImage
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0, 0, 0, 0 // unused (bi?PelsPerMeter, biClr*)
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};
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return tex_codec_write(t, transforms, &hdr, hdr_size, da);
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}
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TEX_CODEC_REGISTER(bmp);
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