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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef CONTENT_BROWSER_COMPOSITOR_GL_HELPER_SCALING_H_ | |
| 6 #define CONTENT_BROWSER_COMPOSITOR_GL_HELPER_SCALING_H_ | |
| 7 | |
| 8 #include <deque> | |
| 9 #include <map> | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "base/macros.h" | |
| 13 #include "content/browser/compositor/gl_helper.h" | |
| 14 #include "ui/gfx/geometry/rect.h" | |
| 15 #include "ui/gfx/geometry/size.h" | |
| 16 | |
| 17 namespace content { | |
| 18 | |
| 19 class ShaderProgram; | |
| 20 class ScalerImpl; | |
| 21 class GLHelperTest; | |
| 22 | |
| 23 // Implements GPU texture scaling methods. | |
| 24 // Note that you should probably not use this class directly. | |
| 25 // See gl_helper.cc::CreateScaler instead. | |
| 26 class CONTENT_EXPORT GLHelperScaling { | |
| 27 public: | |
| 28 enum ShaderType { | |
| 29 SHADER_BILINEAR, | |
| 30 SHADER_BILINEAR2, | |
| 31 SHADER_BILINEAR3, | |
| 32 SHADER_BILINEAR4, | |
| 33 SHADER_BILINEAR2X2, | |
| 34 SHADER_BICUBIC_UPSCALE, | |
| 35 SHADER_BICUBIC_HALF_1D, | |
| 36 SHADER_PLANAR, | |
| 37 SHADER_YUV_MRT_PASS1, | |
| 38 SHADER_YUV_MRT_PASS2, | |
| 39 }; | |
| 40 | |
| 41 // Similar to ScalerInterface, but can generate multiple outputs. | |
| 42 // Used for YUV conversion in gl_helper.c | |
| 43 class CONTENT_EXPORT ShaderInterface { | |
| 44 public: | |
| 45 ShaderInterface() {} | |
| 46 virtual ~ShaderInterface() {} | |
| 47 // Note that the src_texture will have the min/mag filter set to GL_LINEAR | |
| 48 // and wrap_s/t set to CLAMP_TO_EDGE in this call. | |
| 49 virtual void Execute(GLuint source_texture, | |
| 50 const std::vector<GLuint>& dest_textures) = 0; | |
| 51 }; | |
| 52 | |
| 53 typedef std::pair<ShaderType, bool> ShaderProgramKeyType; | |
| 54 | |
| 55 GLHelperScaling(gpu::gles2::GLES2Interface* gl, GLHelper* helper); | |
| 56 ~GLHelperScaling(); | |
| 57 void InitBuffer(); | |
| 58 | |
| 59 GLHelper::ScalerInterface* CreateScaler(GLHelper::ScalerQuality quality, | |
| 60 gfx::Size src_size, | |
| 61 gfx::Rect src_subrect, | |
| 62 const gfx::Size& dst_size, | |
| 63 bool vertically_flip_texture, | |
| 64 bool swizzle); | |
| 65 | |
| 66 GLHelper::ScalerInterface* CreatePlanarScaler(const gfx::Size& src_size, | |
| 67 const gfx::Rect& src_subrect, | |
| 68 const gfx::Size& dst_size, | |
| 69 bool vertically_flip_texture, | |
| 70 bool swizzle, | |
| 71 const float color_weights[4]); | |
| 72 | |
| 73 ShaderInterface* CreateYuvMrtShader(const gfx::Size& src_size, | |
| 74 const gfx::Rect& src_subrect, | |
| 75 const gfx::Size& dst_size, | |
| 76 bool vertically_flip_texture, | |
| 77 bool swizzle, | |
| 78 ShaderType shader); | |
| 79 | |
| 80 private: | |
| 81 // A ScaleOp represents a pass in a scaler pipeline, in one dimension. | |
| 82 // Note that when quality is GOOD, multiple scaler passes will be | |
| 83 // combined into one operation for increased performance. | |
| 84 // Exposed in the header file for testing purposes. | |
| 85 struct ScaleOp { | |
| 86 ScaleOp(int factor, bool x, int size) | |
| 87 : scale_factor(factor), scale_x(x), scale_size(size) {} | |
| 88 | |
| 89 // Calculate a set of ScaleOp needed to convert an image of size | |
| 90 // |src| into an image of size |dst|. If |scale_x| is true, then | |
| 91 // the calculations are for the X axis of the image, otherwise Y. | |
| 92 // If |allow3| is true, we can use a SHADER_BILINEAR3 to replace | |
| 93 // a scale up and scale down with a 3-tap bilinear scale. | |
| 94 // The calculated ScaleOps are added to |ops|. | |
| 95 static void AddOps(int src, | |
| 96 int dst, | |
| 97 bool scale_x, | |
| 98 bool allow3, | |
| 99 std::deque<ScaleOp>* ops) { | |
| 100 int num_downscales = 0; | |
| 101 if (allow3 && dst * 3 >= src && dst * 2 < src) { | |
| 102 // Technically, this should be a scale up and then a | |
| 103 // scale down, but it makes the optimization code more | |
| 104 // complicated. | |
| 105 ops->push_back(ScaleOp(3, scale_x, dst)); | |
| 106 return; | |
| 107 } | |
| 108 while ((dst << num_downscales) < src) { | |
| 109 num_downscales++; | |
| 110 } | |
| 111 if ((dst << num_downscales) != src) { | |
| 112 ops->push_back(ScaleOp(0, scale_x, dst << num_downscales)); | |
| 113 } | |
| 114 while (num_downscales) { | |
| 115 num_downscales--; | |
| 116 ops->push_back(ScaleOp(2, scale_x, dst << num_downscales)); | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 // Update |size| to its new size. Before calling this function | |
| 121 // |size| should be the size of the input image. After calling it, | |
| 122 // |size| will be the size of the image after this particular | |
| 123 // scaling operation. | |
| 124 void UpdateSize(gfx::Size* subrect) { | |
| 125 if (scale_x) { | |
| 126 subrect->set_width(scale_size); | |
| 127 } else { | |
| 128 subrect->set_height(scale_size); | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 // A scale factor of 0 means upscale | |
| 133 // 2 means 50% scale | |
| 134 // 3 means 33% scale, etc. | |
| 135 int scale_factor; | |
| 136 bool scale_x; // Otherwise y | |
| 137 int scale_size; // Size to scale to. | |
| 138 }; | |
| 139 | |
| 140 // Full specification for a single scaling stage. | |
| 141 struct ScalerStage { | |
| 142 ScalerStage(ShaderType shader_, | |
| 143 gfx::Size src_size_, | |
| 144 gfx::Rect src_subrect_, | |
| 145 gfx::Size dst_size_, | |
| 146 bool scale_x_, | |
| 147 bool vertically_flip_texture_, | |
| 148 bool swizzle_); | |
| 149 ScalerStage(const ScalerStage& other); | |
| 150 ShaderType shader; | |
| 151 gfx::Size src_size; | |
| 152 gfx::Rect src_subrect; | |
| 153 gfx::Size dst_size; | |
| 154 bool scale_x; | |
| 155 bool vertically_flip_texture; | |
| 156 bool swizzle; | |
| 157 }; | |
| 158 | |
| 159 // Compute a vector of scaler stages for a particular | |
| 160 // set of input/output parameters. | |
| 161 void ComputeScalerStages(GLHelper::ScalerQuality quality, | |
| 162 const gfx::Size& src_size, | |
| 163 const gfx::Rect& src_subrect, | |
| 164 const gfx::Size& dst_size, | |
| 165 bool vertically_flip_texture, | |
| 166 bool swizzle, | |
| 167 std::vector<ScalerStage>* scaler_stages); | |
| 168 | |
| 169 // Take two queues of ScaleOp structs and generate a | |
| 170 // vector of scaler stages. This is the second half of | |
| 171 // ComputeScalerStages. | |
| 172 void ConvertScalerOpsToScalerStages( | |
| 173 GLHelper::ScalerQuality quality, | |
| 174 gfx::Size src_size, | |
| 175 gfx::Rect src_subrect, | |
| 176 const gfx::Size& dst_size, | |
| 177 bool vertically_flip_texture, | |
| 178 bool swizzle, | |
| 179 std::deque<GLHelperScaling::ScaleOp>* x_ops, | |
| 180 std::deque<GLHelperScaling::ScaleOp>* y_ops, | |
| 181 std::vector<ScalerStage>* scaler_stages); | |
| 182 | |
| 183 scoped_refptr<ShaderProgram> GetShaderProgram(ShaderType type, bool swizzle); | |
| 184 | |
| 185 // Interleaved array of 2-dimentional vertex positions (x, y) and | |
| 186 // 2-dimentional texture coordinates (s, t). | |
| 187 static const GLfloat kVertexAttributes[]; | |
| 188 | |
| 189 gpu::gles2::GLES2Interface* gl_; | |
| 190 GLHelper* helper_; | |
| 191 | |
| 192 // The buffer that holds the vertices and the texture coordinates data for | |
| 193 // drawing a quad. | |
| 194 ScopedBuffer vertex_attributes_buffer_; | |
| 195 | |
| 196 std::map<ShaderProgramKeyType, scoped_refptr<ShaderProgram>> shader_programs_; | |
| 197 | |
| 198 friend class ShaderProgram; | |
| 199 friend class ScalerImpl; | |
| 200 friend class GLHelperTest; | |
| 201 DISALLOW_COPY_AND_ASSIGN(GLHelperScaling); | |
| 202 }; | |
| 203 | |
| 204 } // namespace content | |
| 205 | |
| 206 #endif // CONTENT_BROWSER_COMPOSITOR_GL_HELPER_SCALING_H_ | |
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Chromium Code Reviews
Issue 1902463002:
Introduce components/display_compositor (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master