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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
#ifdef WORDS_BIGENDIAN
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#define MAKE_UINT32(u0, u1, u2, u3) (u3 | (u2<<8) | (u1<<16) | (u0<<24))
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#define MASK_UINT32_CHANNEL_0 0xff000000
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#define MASK_UINT32_CHANNEL_1 0x00ff0000
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#define MASK_UINT32_CHANNEL_2 0x0000ff00
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#define MASK_UINT32_CHANNEL_3 0x000000ff
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#else
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#define MAKE_UINT32(u0, u1, u2, u3) (u0 | (u1<<8) | (u2<<16) | (u3<<24))
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#define MASK_UINT32_CHANNEL_0 0x000000ff
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#define MASK_UINT32_CHANNEL_1 0x0000ff00
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#define MASK_UINT32_CHANNEL_2 0x00ff0000
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#define MASK_UINT32_CHANNEL_3 0xff000000
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#endif
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#define SHIFTFORDIV255(a)\
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((((a) >> 8) + a) >> 8)
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/* like (a * b + 127) / 255), but much faster on most platforms */
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#define MULDIV255(a, b, tmp)\
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(tmp = (a) * (b) + 128, SHIFTFORDIV255(tmp))
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#define DIV255(a, tmp)\
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(tmp = (a) + 128, SHIFTFORDIV255(tmp))
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#define BLEND(mask, in1, in2, tmp1)\
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DIV255(in1 * (255 - mask) + in2 * mask, tmp1)
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#define PREBLEND(mask, in1, in2, tmp1)\
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(MULDIV255(in1, (255 - mask), tmp1) + in2)
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/* This is to work around a bug in GCC prior 4.9 in 64 bit mode.
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GCC generates code with partial dependency which is 3 times slower.
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See: http://stackoverflow.com/a/26588074/253146 */
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#if defined(__x86_64__) && defined(__SSE__) && ! defined(__NO_INLINE__) && \
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! defined(__clang__) && defined(GCC_VERSION) && (GCC_VERSION < 40900)
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static float __attribute__((always_inline)) inline _i2f(int v) {
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float x;
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__asm__("xorps %0, %0; cvtsi2ss %1, %0" : "=X"(x) : "r"(v) );
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return x;
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}
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#else
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static float inline _i2f(int v) { return (float) v; }
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#endif
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