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@@ -13,7 +13,7 @@
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Primarily of interest to game developers and other people who can
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avoid problematic images and only need the trivial interface
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- JPEG baseline & progressive (no arithmetic)
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+ JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
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PNG 1/2/4/8-bit-per-channel (16 bpc not supported)
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TGA (not sure what subset, if a subset)
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@@ -197,9 +197,9 @@ License:
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// DOCUMENTATION
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//
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// Limitations:
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-// - no jpeg progressive support
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// - no 16-bit-per-channel PNG
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// - no 12-bit-per-channel JPEG
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+// - no JPEGs with arithmetic coding
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// - no 1-bit BMP
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// - GIF always returns *comp=4
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//
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@@ -669,6 +669,7 @@ static int stbi__sse2_available()
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#ifdef STBI_NEON
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#include <arm_neon.h>
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+// assume GCC or Clang on ARM targets
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#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
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#endif
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@@ -1293,10 +1294,9 @@ static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
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//////////////////////////////////////////////////////////////////////////////
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//
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-// "baseline" JPEG/JFIF decoder (not actually fully baseline implementation)
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+// "baseline" JPEG/JFIF decoder
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//
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// simple implementation
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-// - channel subsampling of at most 2 in each dimension
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// - doesn't support delayed output of y-dimension
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// - simple interface (only one output format: 8-bit interleaved RGB)
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// - doesn't try to recover corrupt jpegs
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@@ -1310,13 +1310,8 @@ static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
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// - quality integer IDCT derived from IJG's 'slow'
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// performance
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// - fast huffman; reasonable integer IDCT
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+// - some SIMD kernels for common paths on targets with SSE2/NEON
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// - uses a lot of intermediate memory, could cache poorly
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-// - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4
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-// stb_jpeg: 1.34 seconds (MSVC6, default release build)
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-// stb_jpeg: 1.06 seconds (MSVC6, processor = Pentium Pro)
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-// IJL11.dll: 1.08 seconds (compiled by intel)
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-// IJG 1998: 0.98 seconds (MSVC6, makefile provided by IJG)
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-// IJG 1998: 0.95 seconds (MSVC6, makefile + proc=PPro)
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#ifndef STBI_NO_JPEG
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Fabian Giesen