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Side by Side Diff: src/core/SkDistanceFieldGen.h

Issue 227593010: Move distance field generation to the glyph cache (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Re-disable distance fields Created 6 years, 8 months ago
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1 /* 1 /*
2 * Copyright 2014 Google Inc. 2 * Copyright 2014 Google Inc.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license that can be 4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file. 5 * found in the LICENSE file.
6 */ 6 */
7 #ifndef SkDistanceFieldGen_DEFINED 7 #ifndef SkDistanceFieldGen_DEFINED
8 #define SkDistanceFieldGen_DEFINED 8 #define SkDistanceFieldGen_DEFINED
9 9
10 #include "SkTypes.h"
11
robertphillips 2014/04/11 14:13:00 Is this comment right? Seems like this would be ma
jvanverth1 2014/04/11 17:54:14 Done.
12 // the max magnitude for the distance field
13 #define SK_DistanceFieldRange 4
14 // the final distance field needs additional texels on each side to handle
15 // the maximum distance + 1 for bilerp
16 #define SK_DistanceFieldPad (SK_DistanceFieldRange+1)
17
18 // for the fragment shader
19 // The distance field is constructed as unsigned char values, so that the zero v alue is at 128,
20 // and the range is [-4, 4 - 1/255). Hence our multiplier is 8 - 1/32 and zero t hreshold is 128/255.
21 #define SK_DistanceFieldMultiplier "7.96875"
22 #define SK_DistanceFieldThreshold "0.50196078431"
23
10 /** Given 8-bit mask data, generate the associated distance field 24 /** Given 8-bit mask data, generate the associated distance field
11 25
12 * @param distanceField The distance field to be generated. Should already be allocated 26 * @param distanceField The distance field to be generated. Should already be allocated
robertphillips 2014/04/11 14:13:00 padding below?
jvanverth1 2014/04/11 17:54:14 Done.
13 * by the client with the padding below. 27 * by the client with the padding below.
14 * @param image 8-bit mask we're using to generate the distance fie ld. 28 * @param image 8-bit mask we're using to generate the distance fie ld.
15 * @param w Width of the image. 29 * @param w Width of the image.
16 * @param h Height of the image. 30 * @param h Height of the image.
robertphillips 2014/04/11 14:13:00 rowBytes?
jvanverth1 2014/04/11 17:54:14 Done.
17 * @param distanceMagnitude Largest possible absolute value for the distance. T he distance field
18 * will be padded to w + 2*distanceMagnitude, h + 2*di stanceMagnitude.
19 */ 31 */
20 bool SkGenerateDistanceFieldFromImage(unsigned char* distanceField, 32 bool SkGenerateDistanceFieldFromA8Image(unsigned char* distanceField,
21 const unsigned char* image, 33 const unsigned char* image,
22 int w, int h, 34 int w, int h, int rowBytes);
23 int distanceMagnitude); 35
36 /** Given 1-bit mask data, generate the associated distance field
37
38 * @param distanceField The distance field to be generated. Should already be allocated
39 * by the client with the padding below.
40 * @param image 1-bit mask we're using to generate the distance fie ld.
41 * @param w Width of the image.
42 * @param h Height of the image.
robertphillips 2014/04/11 14:13:00 rowBytes?
jvanverth1 2014/04/11 17:54:14 Done.
43 */
44 bool SkGenerateDistanceFieldFromBWImage(unsigned char* distanceField,
45 const unsigned char* image,
46 int w, int h, int rowBytes);
47
48 /** Given width and height of original image, return size (in bytes) of distance field
49 * @param w Width of the original image.
50 * @param h Height of the original image.
51 */
52 inline size_t SkComputeDistanceFieldSize(int w, int h) {
53 return (w + 2*SK_DistanceFieldPad) * (h + 2*SK_DistanceFieldPad) * sizeof(un signed char);
54 }
24 55
25 #endif 56 #endif
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