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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef SKIA_EXT_CONVOLVER_H_ | 5 #ifndef SKIA_EXT_CONVOLVER_H_ |
6 #define SKIA_EXT_CONVOLVER_H_ | 6 #define SKIA_EXT_CONVOLVER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <cmath> | 9 #include <cmath> |
10 #include <vector> | 10 #include <vector> |
11 | 11 |
12 #include "base/basictypes.h" | 12 #include "base/basictypes.h" |
13 #include "base/cpu.h" | |
13 | 14 |
14 // avoid confusion with Mac OS X's math library (Carbon) | 15 // avoid confusion with Mac OS X's math library (Carbon) |
15 #if defined(__APPLE__) | 16 #if defined(__APPLE__) |
16 #undef FloatToFixed | 17 #undef FloatToFixed |
17 #undef FixedToFloat | 18 #undef FixedToFloat |
18 #endif | 19 #endif |
19 | 20 |
20 namespace skia { | 21 namespace skia { |
21 | 22 |
22 // Represents a filter in one dimension. Each output pixel has one entry in this | 23 // Represents a filter in one dimension. Each output pixel has one entry in this |
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91 int* filter_length) const { | 92 int* filter_length) const { |
92 const FilterInstance& filter = filters_[value_offset]; | 93 const FilterInstance& filter = filters_[value_offset]; |
93 *filter_offset = filter.offset; | 94 *filter_offset = filter.offset; |
94 *filter_length = filter.length; | 95 *filter_length = filter.length; |
95 if (filter.length == 0) { | 96 if (filter.length == 0) { |
96 return NULL; | 97 return NULL; |
97 } | 98 } |
98 return &filter_values_[filter.data_location]; | 99 return &filter_values_[filter.data_location]; |
99 } | 100 } |
100 | 101 |
102 | |
103 inline void PaddingForSIMD(int padding_count) { | |
104 // Padding |padding_count| of more dummy coefficients after the coefficients | |
105 // of last filter to prevent SIMD instructions which load 8 or 16 bytes | |
106 // together to access invalid memory areas. We are not trying to align the | |
107 // coefficients right now due to the opaqueness of <vector> implementation. | |
108 // This has to be done after all |AddFilter| calls. | |
brettw
2011/02/25 06:43:02
I get this now, thanks! I presume that in the futu
jiesun
2011/03/07 18:57:15
correct. it is not done in this patch, because I a
| |
109 for (int i = 0; i < padding_count; ++i) | |
110 filter_values_.push_back(static_cast<Fixed>(0)); | |
111 } | |
112 | |
101 private: | 113 private: |
102 struct FilterInstance { | 114 struct FilterInstance { |
103 // Offset within filter_values for this instance of the filter. | 115 // Offset within filter_values for this instance of the filter. |
104 int data_location; | 116 int data_location; |
105 | 117 |
106 // Distance from the left of the filter to the center. IN PIXELS | 118 // Distance from the left of the filter to the center. IN PIXELS |
107 int offset; | 119 int offset; |
108 | 120 |
109 // Number of values in this filter instance. | 121 // Number of values in this filter instance. |
110 int length; | 122 int length; |
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141 // The layout in memory is assumed to be 4-bytes per pixel in B-G-R-A order | 153 // The layout in memory is assumed to be 4-bytes per pixel in B-G-R-A order |
142 // (this is ARGB when loaded into 32-bit words on a little-endian machine). | 154 // (this is ARGB when loaded into 32-bit words on a little-endian machine). |
143 void BGRAConvolve2D(const unsigned char* source_data, | 155 void BGRAConvolve2D(const unsigned char* source_data, |
144 int source_byte_row_stride, | 156 int source_byte_row_stride, |
145 bool source_has_alpha, | 157 bool source_has_alpha, |
146 const ConvolutionFilter1D& xfilter, | 158 const ConvolutionFilter1D& xfilter, |
147 const ConvolutionFilter1D& yfilter, | 159 const ConvolutionFilter1D& yfilter, |
148 int output_byte_row_stride, | 160 int output_byte_row_stride, |
149 unsigned char* output); | 161 unsigned char* output); |
150 | 162 |
163 // Note: You should never use these functions externally; these functions are | |
164 // exposed only for testing purpose. | |
165 void BGRAConvolve2D_C(const unsigned char* source_data, | |
166 int source_byte_row_stride, | |
167 bool source_has_alpha, | |
168 const ConvolutionFilter1D& filter_x, | |
169 const ConvolutionFilter1D& filter_y, | |
170 int output_byte_row_stride, | |
171 unsigned char* output); | |
172 | |
173 void BGRAConvolve2D_SSE2(const unsigned char* source_data, | |
174 int source_byte_row_stride, | |
175 bool source_has_alpha, | |
176 const ConvolutionFilter1D& filter_x, | |
177 const ConvolutionFilter1D& filter_y, | |
178 int output_byte_row_stride, | |
179 unsigned char* output); | |
151 } // namespace skia | 180 } // namespace skia |
152 | 181 |
153 #endif // SKIA_EXT_CONVOLVER_H_ | 182 #endif // SKIA_EXT_CONVOLVER_H_ |
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