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[Git][freetype/freetype-demos][master] 2 commits: [graph] Minor fixes.

From: Alexei Podtelezhnikov (@apodtele)
Subject: [Git][freetype/freetype-demos][master] 2 commits: [graph] Minor fixes.
Date: Sun, 28 Aug 2022 03:19:07 +0000

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

  • efc6fa2c
    by Alexei Podtelezhnikov at 2022-08-27T23:07:15-04:00 
    [graph] Minor fixes.

(gblender_clear): Initialize with black background, whereas
foreground stays invalid.
(gblender_lookup_channel): Increase cache utilization.
  • 8d0e6ac2
    by Alexei Podtelezhnikov at 2022-08-27T23:15:32-04:00 
    * graph/gblender.c (gblender_lookup): Quest for perfect hash function.

1 changed file:

Changes:

  • graph/gblender.c
    ... ... @@ -129,15 +129,15 @@ gblender_clear( GBlender blender )
    129 129 
         for ( nn = 0; nn < GBLENDER_KEY_COUNT; nn++ )
    130 130 
           chan_keys[nn].index = -1;
    131 131
    132 
    -    blender->cache_r_back  = ~0U;
    132 
    +    blender->cache_r_back  = 0;
    133 133 
         blender->cache_r_fore  = ~0U;
    134 134 
         blender->cache_r_cells = NULL;
    135 135
    136 
    -    blender->cache_g_back  = ~0U;
    136 
    +    blender->cache_g_back  = 0;
    137 137 
         blender->cache_g_fore  = ~0U;
    138 138 
         blender->cache_g_cells = NULL;
    139 139
    140 
    -    blender->cache_b_back  = ~0U;
    140 
    +    blender->cache_b_back  = 0;
    141 141 
         blender->cache_b_fore  = ~0U;
    142 142 
         blender->cache_b_cells = NULL;
    143 143 
       }
    ... ... @@ -146,7 +146,7 @@ gblender_clear( GBlender blender )
    146 146 
         for ( nn = 0; nn < GBLENDER_KEY_COUNT; nn++ )
    147 147 
           keys[nn].cells = NULL;
    148 148
    149 
    -    blender->cache_back  = ~0U;
    149 
    +    blender->cache_back  = 0;
    150 150 
         blender->cache_fore  = ~0U;
    151 151 
         blender->cache_cells = NULL;
    152 152 
       }
    ... ... @@ -274,7 +274,7 @@ gblender_lookup( GBlender blender,
    274 274 
       blender->stat_lookups++;
    275 275 
     #endif
    276 276
    277 
    -  idx = ( background ^ foreground * 7 ) % (GBLENDER_KEY_COUNT-1);
    277 
    +  idx = ( background ^ foreground ^ 0x55555555 ) % (GBLENDER_KEY_COUNT-1);
    278 278
    279 279 
       key = blender->keys + idx;
    280 280
    ... ... @@ -352,7 +352,8 @@ gblender_lookup_channel( GBlender blender,
    352 352 
       blender->stat_lookups++;
    353 353 
     #endif
    354 354
    355 
    -  idx = ( background ^ foreground * 7 ) % (GBLENDER_KEY_COUNT-1);
    355 
    +  idx = ( background ^ foreground * 7 ) %
    356 
    +        ( GBLENDER_KEY_COUNT*GBLENDER_CELL_SIZE*sizeof(GBlenderCell) - 1);
    356 357
    357 358 
       key = (GBlenderChanKey)blender->keys + idx;
    358 359

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