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@@ -11,6 +11,7 @@ |
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11
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11
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#include "ftdense.h"
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12
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12
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13
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13
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#include <math.h>
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14
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+#include <tmmintrin.h>
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14
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15
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#include "ftdenseerrs.h"
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15
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16
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16
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17
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#define PIXEL_BITS 8
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@@ -372,22 +373,40 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target ) |
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372
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373
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373
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374
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unsigned char* dest = target->buffer;
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374
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375
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unsigned char* dest_end = target->buffer + worker->m_w * worker->m_h;
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375
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- float value = 0.0f;
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376
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- while ( dest < dest_end )
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377
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- {
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378
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- value += *source++;
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379
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- if ( value > 0.0f )
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380
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- {
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381
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- int n = (int)( fabs( value ) * 255.0f + 0.5f );
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382
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- if ( n > 255 )
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383
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- n = 255;
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384
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- *dest = (unsigned char)n;
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385
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- }
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386
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- else
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387
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- *dest = 0;
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388
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- dest++;
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376
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+
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377
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+ __m128 offset = _mm_setzero_ps();
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378
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+ __m128i mask = _mm_set1_epi32(0x0c080400);
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379
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+ __m128 sign_mask = _mm_set1_ps(-0.f);
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380
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+ for (int i = 0; i < worker->m_h*worker->m_w; i += 4) {
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381
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+ __m128 x = _mm_load_ps(&source[i]);
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382
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+ x = _mm_add_ps(x, _mm_castsi128_ps(_mm_slli_si128(_mm_castps_si128(x), 4)));
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383
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+ x = _mm_add_ps(x, _mm_shuffle_ps(_mm_setzero_ps(), x, 0x40));
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384
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+ x = _mm_add_ps(x, offset);
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385
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+ __m128 y = _mm_andnot_ps(sign_mask, x); // fabs(x)
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386
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+ y = _mm_min_ps(y, _mm_set1_ps(1.0f));
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+ y = _mm_mul_ps(y, _mm_set1_ps(255.0f));
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388
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+ __m128i z = _mm_cvtps_epi32(y);
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389
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+ z = _mm_shuffle_epi8(z, mask);
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+ _mm_store_ss((float *)&dest[i], (__m128)z);
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+ offset = _mm_shuffle_ps(x, x, _MM_SHUFFLE(3, 3, 3, 3));
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389
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392
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}
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390
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393
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+ // float value = 0.0f;
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395
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+ // while ( dest < dest_end )
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396
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+ // {
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397
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+ // value += *source++;
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398
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+ // if ( value > 0.0f )
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399
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+ // {
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400
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+ // int n = (int)( fabs( value ) * 255.0f + 0.5f );
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401
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+ // if ( n > 255 )
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402
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+ // n = 255;
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+ // *dest = (unsigned char)n;
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+ // }
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+ // else
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406
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+ // *dest = 0;
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+ // dest++;
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408
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+ // }
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409
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+
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391
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410
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free(worker->m_a);
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392
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411
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return error;
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393
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412
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}
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