[Git][freetype/freetype][gsoc-anurag-2022-final] [dense] Add SIMD support to rasterizer

[Anurag Thakur (@AdbhutDev)]

Anurag Thakur pushed to branch gsoc-anurag-2022-final at FreeType / FreeType

Commits:

• bdeb70bc
  by Anurag Thakur at 2022-11-19T12:34:43+05:30

  [dense] Add SIMD support to rasterizer
  
  * src/dense/ftdense: Use SSE4.1 for final accumulation step
  (FT_SSE4_1): Macro which checks if SSE4.1 is available
  
  * src/dense/rules.mk: Enable linking for SSE4.1
  

2 changed files:

• src/dense/ftdense.c
• src/dense/rules.mk

Changes:

src/dense/ftdense.c

---

...	...	@@ -12,6 +12,22 @@
12	12	#include "ftdense.h"
13	13	#include "ftdenseerrs.h"
14	14
	15	+#if defined( __SSE4_1__ ) || \
	16	+ defined( __x86_64__ ) || \
	17	+ defined( _M_AMD64 ) || \
	18	+ ( defined( _M_IX86_FP ) && _M_IX86_FP >= 2 )
	19	+# define FT_SSE4_1 1
	20	+#else
	21	+# define FT_SSE4_1 0
	22	+#endif
	23	+
	24	+
	25	+#if FT_SSE4_1
	26	+
	27	+ #include <tmmintrin.h>
	28	+
	29	+#endif
	30	+
15	31	#define PIXEL_BITS 8
16	32
17	33	#define ONE_PIXEL ( 1 << PIXEL_BITS )
...	...	@@ -349,9 +365,30 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
349	365	&dense_decompose_funcs, worker );
350	366	// Render into bitmap
351	367	const float* source = worker->m_a;
352		-
353	368	unsigned char* dest = target->buffer;
354	369	unsigned char* dest_end = target->buffer + worker->m_w * worker->m_h;
	370	+
	371	+#if FT_SSE4_1
	372	+
	373	+ __m128 offset = _mm_setzero_ps();
	374	+ __m128i mask = _mm_set1_epi32(0x0c080400);
	375	+ __m128 sign_mask = _mm_set1_ps(-0.f);
	376	+ for (int i = 0; i < worker->m_h*worker->m_w; i += 4) {
	377	+ __m128 x = _mm_load_ps(&source[i]);
	378	+ x = _mm_add_ps(x, _mm_castsi128_ps(_mm_slli_si128(_mm_castps_si128(x), 4)));
	379	+ x = _mm_add_ps(x, _mm_shuffle_ps(_mm_setzero_ps(), x, 0x40));
	380	+ x = _mm_add_ps(x, offset);
	381	+ __m128 y = _mm_andnot_ps(sign_mask, x); // fabs(x)
	382	+ y = _mm_min_ps(y, _mm_set1_ps(1.0f));
	383	+ y = _mm_mul_ps(y, _mm_set1_ps(255.0f));
	384	+ __m128i z = _mm_cvtps_epi32(y);
	385	+ z = _mm_shuffle_epi8(z, mask);
	386	+ _mm_store_ss((float *)&dest[i], (__m128)z);
	387	+ offset = _mm_shuffle_ps(x, x, _MM_SHUFFLE(3, 3, 3, 3));
	388	+ }
	389	+
	390	+#else /* FT_SSE4_1 */
	391	+
355	392	float value = 0.0f;
356	393	while ( dest < dest_end )
357	394	{
...	...	@@ -368,6 +405,8 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
368	405	dest++;
369	406	}
370	407
	408	+#endif /* FT_SSE4_1 */
	409	+
371	410	free(worker->m_a);
372	411	return error;
373	412	}

src/dense/rules.mk

---

...	...	@@ -22,9 +22,9 @@ DENSE_DIR := $(SRC_DIR)/dense
22	22	#
23	23	DENSE_COMPILE := $(CC) $(ANSIFLAGS) \
24	24	$I$(subst /,$(COMPILER_SEP),$(DENSE_DIR)) \
25		- $(INCLUDE_FLAGS) \
26		- $(FT_CFLAGS)
27		-
	25	+ $(INCLUDE_FLAGS) \
	26	+ $(FT_CFLAGS) \
	27	+ "-msse4.1"
28	28
29	29	# DENSE driver sources (i.e., C files)
30	30	#

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