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| 1 // Copyright 2014 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 #include "base/logging.h" | |
| 6 #include "components/display_compositor/gl_helper_readback_support.h" | |
| 7 #include "gpu/GLES2/gl2extchromium.h" | |
| 8 #include "third_party/skia/include/core/SkImageInfo.h" | |
| 9 | |
| 10 namespace display_compositor { | |
| 11 | |
| 12 GLHelperReadbackSupport::GLHelperReadbackSupport(gpu::gles2::GLES2Interface* gl) | |
| 13 : gl_(gl) { | |
| 14 InitializeReadbackSupport(); | |
| 15 } | |
| 16 | |
| 17 GLHelperReadbackSupport::~GLHelperReadbackSupport() {} | |
| 18 | |
| 19 void GLHelperReadbackSupport::InitializeReadbackSupport() { | |
| 20 // We are concerned about 16, 32-bit formats only. The below are the most | |
| 21 // used 16, 32-bit formats. In future if any new format support is needed | |
| 22 // that should be added here. Initialize the array with | |
| 23 // GLHelperReadbackSupport::NOT_SUPPORTED as we dont know the supported | |
| 24 // formats yet. | |
| 25 for (int i = 0; i <= kLastEnum_SkColorType; ++i) { | |
| 26 format_support_table_[i] = GLHelperReadbackSupport::NOT_SUPPORTED; | |
| 27 } | |
| 28 // TODO(sikugu): kAlpha_8_SkColorType support check is failing on mesa. | |
| 29 // See crbug.com/415667. | |
| 30 CheckForReadbackSupport(kRGB_565_SkColorType); | |
| 31 CheckForReadbackSupport(kARGB_4444_SkColorType); | |
| 32 CheckForReadbackSupport(kRGBA_8888_SkColorType); | |
| 33 CheckForReadbackSupport(kBGRA_8888_SkColorType); | |
| 34 // Further any formats, support should be checked here. | |
| 35 } | |
| 36 | |
| 37 void GLHelperReadbackSupport::CheckForReadbackSupport( | |
| 38 SkColorType texture_format) { | |
| 39 bool supports_format = false; | |
| 40 switch (texture_format) { | |
| 41 case kRGB_565_SkColorType: | |
| 42 supports_format = SupportsFormat(GL_RGB, GL_UNSIGNED_SHORT_5_6_5); | |
| 43 break; | |
| 44 case kRGBA_8888_SkColorType: | |
| 45 // This is the baseline, assume always true. | |
| 46 supports_format = true; | |
| 47 break; | |
| 48 case kBGRA_8888_SkColorType: | |
| 49 supports_format = SupportsFormat(GL_BGRA_EXT, GL_UNSIGNED_BYTE); | |
| 50 break; | |
| 51 case kARGB_4444_SkColorType: | |
| 52 supports_format = false; | |
| 53 break; | |
| 54 default: | |
| 55 NOTREACHED(); | |
| 56 supports_format = false; | |
| 57 break; | |
| 58 } | |
| 59 DCHECK((int)texture_format <= (int)kLastEnum_SkColorType); | |
| 60 format_support_table_[texture_format] = | |
| 61 supports_format ? GLHelperReadbackSupport::SUPPORTED | |
| 62 : GLHelperReadbackSupport::NOT_SUPPORTED; | |
| 63 } | |
| 64 | |
| 65 void GLHelperReadbackSupport::GetAdditionalFormat(GLenum format, | |
| 66 GLenum type, | |
| 67 GLenum* format_out, | |
| 68 GLenum* type_out) { | |
| 69 for (unsigned int i = 0; i < format_cache_.size(); i++) { | |
| 70 if (format_cache_[i].format == format && format_cache_[i].type == type) { | |
| 71 *format_out = format_cache_[i].read_format; | |
| 72 *type_out = format_cache_[i].read_type; | |
| 73 return; | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 const int kTestSize = 64; | |
| 78 display_compositor::ScopedTexture dst_texture(gl_); | |
| 79 ScopedTextureBinder<GL_TEXTURE_2D> texture_binder(gl_, dst_texture); | |
| 80 gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); | |
| 81 gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); | |
| 82 gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); | |
| 83 gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); | |
| 84 gl_->TexImage2D(GL_TEXTURE_2D, 0, format, kTestSize, kTestSize, 0, format, | |
| 85 type, NULL); | |
| 86 ScopedFramebuffer dst_framebuffer(gl_); | |
| 87 ScopedFramebufferBinder<GL_FRAMEBUFFER> framebuffer_binder(gl_, | |
| 88 dst_framebuffer); | |
| 89 gl_->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, | |
| 90 dst_texture, 0); | |
| 91 GLint format_tmp = 0, type_tmp = 0; | |
| 92 gl_->GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &format_tmp); | |
| 93 gl_->GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &type_tmp); | |
| 94 *format_out = format_tmp; | |
| 95 *type_out = type_tmp; | |
| 96 | |
| 97 struct FormatCacheEntry entry = {format, type, *format_out, *type_out}; | |
| 98 format_cache_.push_back(entry); | |
| 99 } | |
| 100 | |
| 101 bool GLHelperReadbackSupport::SupportsFormat(GLenum format, GLenum type) { | |
| 102 // GLES2.0 Specification says this pairing is always supported | |
| 103 // with additional format from GL_IMPLEMENTATION_COLOR_READ_FORMAT/TYPE | |
| 104 if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) | |
| 105 return true; | |
| 106 | |
| 107 bool supports_format = false; | |
| 108 GLenum ext_format = 0, ext_type = 0; | |
| 109 GetAdditionalFormat(format, type, &ext_format, &ext_type); | |
| 110 if ((ext_format == format) && (ext_type == type)) { | |
| 111 supports_format = true; | |
| 112 } | |
| 113 return supports_format; | |
| 114 } | |
| 115 | |
| 116 GLHelperReadbackSupport::FormatSupport | |
| 117 GLHelperReadbackSupport::GetReadbackConfig(SkColorType color_type, | |
| 118 bool can_swizzle, | |
| 119 GLenum* format, | |
| 120 GLenum* type, | |
| 121 size_t* bytes_per_pixel) { | |
| 122 DCHECK(format && type && bytes_per_pixel); | |
| 123 *bytes_per_pixel = 4; | |
| 124 *type = GL_UNSIGNED_BYTE; | |
| 125 GLenum new_format = 0, new_type = 0; | |
| 126 switch (color_type) { | |
| 127 case kRGB_565_SkColorType: | |
| 128 if (format_support_table_[color_type] == | |
| 129 GLHelperReadbackSupport::SUPPORTED) { | |
| 130 *format = GL_RGB; | |
| 131 *type = GL_UNSIGNED_SHORT_5_6_5; | |
| 132 *bytes_per_pixel = 2; | |
| 133 return GLHelperReadbackSupport::SUPPORTED; | |
| 134 } | |
| 135 break; | |
| 136 case kRGBA_8888_SkColorType: | |
| 137 *format = GL_RGBA; | |
| 138 if (can_swizzle) { | |
| 139 // If GL_BGRA_EXT is advertised as the readback format through | |
| 140 // GL_IMPLEMENTATION_COLOR_READ_FORMAT then assume it is preferred by | |
| 141 // the implementation for performance. | |
| 142 GetAdditionalFormat(*format, *type, &new_format, &new_type); | |
| 143 | |
| 144 if (new_format == GL_BGRA_EXT && new_type == GL_UNSIGNED_BYTE) { | |
| 145 *format = GL_BGRA_EXT; | |
| 146 return GLHelperReadbackSupport::SWIZZLE; | |
| 147 } | |
| 148 } | |
| 149 return GLHelperReadbackSupport::SUPPORTED; | |
| 150 case kBGRA_8888_SkColorType: | |
| 151 *format = GL_BGRA_EXT; | |
| 152 if (format_support_table_[color_type] == | |
| 153 GLHelperReadbackSupport::SUPPORTED) | |
| 154 return GLHelperReadbackSupport::SUPPORTED; | |
| 155 | |
| 156 if (can_swizzle) { | |
| 157 *format = GL_RGBA; | |
| 158 return GLHelperReadbackSupport::SWIZZLE; | |
| 159 } | |
| 160 | |
| 161 break; | |
| 162 case kARGB_4444_SkColorType: | |
| 163 return GLHelperReadbackSupport::NOT_SUPPORTED; | |
| 164 default: | |
| 165 NOTREACHED(); | |
| 166 break; | |
| 167 } | |
| 168 | |
| 169 return GLHelperReadbackSupport::NOT_SUPPORTED; | |
| 170 } | |
| 171 | |
| 172 } // namespace display_compositor | |
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Chromium Code Reviews
Issue 1905863002:
Revert of Introduce components/display_compositor (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master