Index: src/opts/SkColorXform_opts.h |
diff --git a/src/opts/SkColorXform_opts.h b/src/opts/SkColorXform_opts.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3fc620f014536896cc2527e0d7480e445ad979f8 |
--- /dev/null |
+++ b/src/opts/SkColorXform_opts.h |
@@ -0,0 +1,181 @@ |
+/* |
+ * Copyright 2016 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+ |
+#ifndef SkColorXform_opts_DEFINED |
+#define SkColorXform_opts_DEFINED |
+ |
+#include "SkColorPriv.h" |
+ |
+namespace SK_OPTS_NS { |
+ |
+static uint8_t clamp_float_to_byte(float v) { |
+ if (v >= 254.5f) { |
+ return 255; |
+ } else if (v < 0.5f) { |
+ return 0; |
+ } else { |
+ return (uint8_t) (v + 0.5f); |
+ } |
+} |
+ |
+static void color_xform_2Dot2_RGBA_to_8888_portable(uint32_t* dst, const uint32_t* src, int len, |
+ const float matrix[16]) { |
+ while (len-- > 0) { |
+ float srcFloats[3]; |
+ srcFloats[0] = (float) ((*src >> 0) & 0xFF); |
+ srcFloats[1] = (float) ((*src >> 8) & 0xFF); |
+ srcFloats[2] = (float) ((*src >> 16) & 0xFF); |
+ |
+ // Convert to linear. |
+ // TODO (msarett): |
+ // We should use X^2.2 here instead of X^2. What is the impact on correctness? |
+ // We should be able to get closer to 2.2 at a small performance cost. |
+ srcFloats[0] = srcFloats[0] * srcFloats[0]; |
+ srcFloats[1] = srcFloats[1] * srcFloats[1]; |
+ srcFloats[2] = srcFloats[2] * srcFloats[2]; |
+ |
+ // Convert to dst gamut. |
+ float dstFloats[3]; |
+ // TODO (msarett): matrix[12], matrix[13], and matrix[14] are almost always zero. |
+ // Should we have another optimized path that avoids the extra addition when they |
+ // are zero? |
+ dstFloats[0] = srcFloats[0] * matrix[0] + srcFloats[1] * matrix[4] + |
+ srcFloats[2] * matrix[8] + matrix[12]; |
+ dstFloats[1] = srcFloats[0] * matrix[1] + srcFloats[1] * matrix[5] + |
+ srcFloats[2] * matrix[9] + matrix[13]; |
+ dstFloats[2] = srcFloats[0] * matrix[2] + srcFloats[1] * matrix[6] + |
+ srcFloats[2] * matrix[10] + matrix[14]; |
+ |
+ // Convert to dst gamma. |
+ // TODO (msarett): |
+ // We should use X^(1/2.2) here instead of X^(1/2). What is the impact on correctness? |
+ // We should be able to get closer to (1/2.2) at a small performance cost. |
+ dstFloats[0] = sqrtf(dstFloats[0]); |
+ dstFloats[1] = sqrtf(dstFloats[1]); |
+ dstFloats[2] = sqrtf(dstFloats[2]); |
+ |
+ *dst = SkPackARGB32NoCheck(((*src >> 24) & 0xFF), |
+ clamp_float_to_byte(dstFloats[0]), |
+ clamp_float_to_byte(dstFloats[1]), |
+ clamp_float_to_byte(dstFloats[2])); |
+ |
+ dst++; |
+ src++; |
+ } |
+} |
+ |
+#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 |
+ |
+static void color_xform_2Dot2_RGBA_to_8888(uint32_t* dst, const uint32_t* src, int len, |
+ const float matrix[16]) { |
+ // Load transformation matrix. |
+ __m128 rXgXbX = _mm_loadu_ps(&matrix[0]); |
+ __m128 rYgYbY = _mm_loadu_ps(&matrix[4]); |
+ __m128 rZgZbZ = _mm_loadu_ps(&matrix[8]); |
+ __m128 rQgQbQ = _mm_loadu_ps(&matrix[12]); |
+ |
+ while (len >= 4) { |
+ // Load 4 pixels and convert them to floats. |
+ __m128i rgba = _mm_loadu_si128((const __m128i*) src); |
+ __m128i byteMask = _mm_set1_epi32(0xFF); |
+ __m128 reds = _mm_cvtepi32_ps(_mm_and_si128( rgba, byteMask)); |
+ __m128 greens = _mm_cvtepi32_ps(_mm_and_si128(_mm_srli_epi32(rgba, 8), byteMask)); |
+ __m128 blues = _mm_cvtepi32_ps(_mm_and_si128(_mm_srli_epi32(rgba, 16), byteMask)); |
+ |
+ // Convert to linear. |
+ // FIXME (msarett): |
+ // Should we be more accurate? |
+ reds = _mm_mul_ps(reds, reds); |
+ greens = _mm_mul_ps(greens, greens); |
+ blues = _mm_mul_ps(blues, blues); |
+ |
+ // Apply the transformation matrix to dst gamut. |
+ // FIXME (msarett): |
+ // rQ, gQ, and bQ are almost always zero. Can we save a couple instructions? |
+ |
+ // Splat rX, rY, rZ, and rQ each across a register. |
+ __m128 rX = _mm_shuffle_ps(rXgXbX, rXgXbX, 0x00); |
+ __m128 rY = _mm_shuffle_ps(rYgYbY, rYgYbY, 0x00); |
+ __m128 rZ = _mm_shuffle_ps(rZgZbZ, rZgZbZ, 0x00); |
+ __m128 rQ = _mm_shuffle_ps(rQgQbQ, rQgQbQ, 0x00); |
+ |
+ // dstReds = rX * reds + rY * greens + rZ * blues + rQ |
+ __m128 dstReds = _mm_mul_ps(reds, rX); |
+ dstReds = _mm_add_ps(dstReds, _mm_mul_ps(greens, rY)); |
+ dstReds = _mm_add_ps(dstReds, _mm_mul_ps(blues, rZ)); |
+ dstReds = _mm_add_ps(dstReds, rQ); |
+ |
+ // Splat gX, gY, gZ, and gQ each across a register. |
+ __m128 gX = _mm_shuffle_ps(rXgXbX, rXgXbX, 0x55); |
+ __m128 gY = _mm_shuffle_ps(rYgYbY, rYgYbY, 0x55); |
+ __m128 gZ = _mm_shuffle_ps(rZgZbZ, rZgZbZ, 0x55); |
+ __m128 gQ = _mm_shuffle_ps(rQgQbQ, rQgQbQ, 0x55); |
+ |
+ // dstGreens = gX * reds + gY * greens + gZ * blues + gQ |
+ __m128 dstGreens = _mm_mul_ps(reds, gX); |
+ dstGreens = _mm_add_ps(dstGreens, _mm_mul_ps(greens, gY)); |
+ dstGreens = _mm_add_ps(dstGreens, _mm_mul_ps(blues, gZ)); |
+ dstGreens = _mm_add_ps(dstGreens, gQ); |
+ |
+ // Splat bX, bY, bZ, and bQ each across a register. |
+ __m128 bX = _mm_shuffle_ps(rXgXbX, rXgXbX, 0xAA); |
+ __m128 bY = _mm_shuffle_ps(rYgYbY, rYgYbY, 0xAA); |
+ __m128 bZ = _mm_shuffle_ps(rZgZbZ, rZgZbZ, 0xAA); |
+ __m128 bQ = _mm_shuffle_ps(rQgQbQ, rQgQbQ, 0xAA); |
+ |
+ // dstBlues = bX * reds + bY * greens + bZ * blues + bQ |
+ __m128 dstBlues = _mm_mul_ps(reds, bX); |
+ dstBlues = _mm_add_ps(dstBlues, _mm_mul_ps(greens, bY)); |
+ dstBlues = _mm_add_ps(dstBlues, _mm_mul_ps(blues, bZ)); |
+ dstBlues = _mm_add_ps(dstBlues, bQ); |
+ |
+ // Convert to dst gamma. |
+ // Note that the reciprocal of the reciprocal sqrt, is just a fast sqrt. |
+ // FIXME (msarett): |
+ // Should we be more accurate? |
+ dstReds = _mm_rcp_ps(_mm_rsqrt_ps(dstReds)); |
+ dstGreens = _mm_rcp_ps(_mm_rsqrt_ps(dstGreens)); |
+ dstBlues = _mm_rcp_ps(_mm_rsqrt_ps(dstBlues)); |
+ |
+ // Clamp floats to 0-255 range. |
+ dstReds = _mm_max_ps(_mm_setzero_ps(), _mm_min_ps(dstReds, _mm_set1_ps(255.0f))); |
+ dstGreens = _mm_max_ps(_mm_setzero_ps(), _mm_min_ps(dstGreens, _mm_set1_ps(255.0f))); |
+ dstBlues = _mm_max_ps(_mm_setzero_ps(), _mm_min_ps(dstBlues, _mm_set1_ps(255.0f))); |
+ |
+ // Convert to bytes and store to memory. |
+ rgba = _mm_and_si128(_mm_set1_epi32(0xFF000000), rgba); |
+#ifdef SK_PMCOLOR_IS_RGBA |
+ rgba = _mm_or_si128(rgba, _mm_cvtps_epi32(dstReds) ); |
+ rgba = _mm_or_si128(rgba, _mm_slli_epi32(_mm_cvtps_epi32(dstGreens), 8)); |
+ rgba = _mm_or_si128(rgba, _mm_slli_epi32(_mm_cvtps_epi32(dstBlues), 16)); |
+#else |
+ rgba = _mm_or_si128(rgba, _mm_cvtps_epi32(dstBlues) ); |
+ rgba = _mm_or_si128(rgba, _mm_slli_epi32(_mm_cvtps_epi32(dstGreens), 8)); |
+ rgba = _mm_or_si128(rgba, _mm_slli_epi32(_mm_cvtps_epi32(dstReds), 16)); |
+#endif |
+ _mm_storeu_si128((__m128i*) dst, rgba); |
+ |
+ dst += 4; |
+ src += 4; |
+ len -= 4; |
+ } |
+ |
+ color_xform_2Dot2_RGBA_to_8888_portable(dst, src, len, matrix); |
+} |
+ |
+#else |
+ |
+static void color_xform_2Dot2_RGBA_to_8888(uint32_t* dst, const uint32_t* src, int len, |
+ const float matrix[16]) { |
+ color_xform_2Dot2_RGBA_to_8888_portable(dst, src, len, matrix); |
+} |
+ |
+#endif |
+ |
+} |
+ |
+#endif // SkColorXform_opts_DEFINED |