1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/gl_i420_converter.h"
#include <utility>
#include "components/viz/common/gpu/context_provider.h"
namespace viz {
GLI420Converter::GLI420Converter(
scoped_refptr<ContextProvider> context_provider)
: GLI420Converter(std::move(context_provider), true) {}
GLI420Converter::GLI420Converter(
scoped_refptr<ContextProvider> context_provider,
bool allow_mrt_path)
: context_provider_(std::move(context_provider)),
step1_(context_provider_),
step2_(context_provider_) {
context_provider_->AddObserver(this);
if (!allow_mrt_path || step1_.GetMaxDrawBuffersSupported() < 2) {
step3_ = std::make_unique<GLScaler>(context_provider_);
step4_ = std::make_unique<GLScaler>(context_provider_);
}
}
GLI420Converter::~GLI420Converter() {
OnContextLost(); // Free context-related resources.
}
bool GLI420Converter::Configure(const Parameters& params) {
Parameters step1_params = params;
if (!step1_params.output_color_space.IsValid()) {
step1_params.output_color_space = gfx::ColorSpace::CreateREC709();
}
// Configure the "step 1" scaler.
if (is_using_mrt_path()) {
step1_params.export_format = Parameters::ExportFormat::NV61;
DCHECK_EQ(step1_params.swizzle[0], params.swizzle[0]);
step1_params.swizzle[1] = GL_RGBA; // Don't swizzle 2nd rendering target.
} else {
step1_params.export_format = Parameters::ExportFormat::INTERLEAVED_QUADS;
step1_params.swizzle[0] = GL_RGBA; // Will swizzle in steps 2-4.
}
if (!step1_.Configure(step1_params)) {
return false;
}
// Configure the "step 2" scaler (and steps 3 and 4 for the non-MRT path) that
// further transform the output from the "step 1" scaler to produce the final
// outputs.
Parameters step2_params;
step2_params.scale_to = gfx::Vector2d(1, 1);
step2_params.source_color_space = step1_params.output_color_space;
step2_params.output_color_space = step1_params.output_color_space;
// Use FAST quality, a single bilinear pass, because there will either be no
// scaling or exactly 50% scaling.
step2_params.quality = Parameters::Quality::FAST;
step2_params.swizzle[0] = params.swizzle[0];
if (is_using_mrt_path()) {
// NV61 provides half-width and full-height U/V. I420 U/V planes are
// half-width and half-height. So, scale Y by 50%.
step2_params.scale_from = gfx::Vector2d(1, 2);
step2_params.export_format =
Parameters::ExportFormat::DEINTERLEAVE_PAIRWISE;
step2_params.swizzle[1] = step2_params.swizzle[0];
if (!step2_.Configure(step2_params)) {
return false;
}
} else {
// Extract a full-size Y plane from the interleaved YUVA from step 1.
step2_params.scale_from = gfx::Vector2d(1, 1);
step2_params.export_format = Parameters::ExportFormat::CHANNEL_0;
if (!step2_.Configure(step2_params)) {
return false;
}
// Extract half-size U/V planes from the interleaved YUVA from step 1.
step2_params.scale_from = gfx::Vector2d(2, 2);
step2_params.export_format = Parameters::ExportFormat::CHANNEL_1;
if (!step3_->Configure(step2_params)) {
return false;
}
step2_params.export_format = Parameters::ExportFormat::CHANNEL_2;
if (!step4_->Configure(step2_params)) {
return false;
}
}
params_ = params;
return true;
}
bool GLI420Converter::Convert(GLuint src_texture,
const gfx::Size& src_texture_size,
const gfx::Vector2d& src_offset,
const gfx::Rect& output_rect,
const GLuint yuv_textures[3]) {
DCHECK_EQ(output_rect.x() % 8, 0);
DCHECK_EQ(output_rect.width() % 8, 0);
DCHECK_EQ(output_rect.y() % 2, 0);
DCHECK_EQ(output_rect.height() % 2, 0);
if (!context_provider_) {
return false;
}
if (is_using_mrt_path()) {
const gfx::Rect luma_output_rect(output_rect.x() / 4, output_rect.y(),
output_rect.width() / 4,
output_rect.height());
EnsureIntermediateTextureDefined(luma_output_rect.size());
const gfx::Rect chroma_output_rect(
gfx::Size(luma_output_rect.width() / 2, luma_output_rect.height() / 2));
return (step1_.ScaleToMultipleOutputs(
src_texture, src_texture_size, src_offset, yuv_textures[0],
intermediate_texture_, luma_output_rect) &&
step2_.ScaleToMultipleOutputs(intermediate_texture_,
intermediate_texture_size_,
gfx::Vector2d(), yuv_textures[1],
yuv_textures[2], chroma_output_rect));
}
// Non-MRT path:
EnsureIntermediateTextureDefined(output_rect.size());
const gfx::Rect luma_output_rect(0, 0, output_rect.width() / 4,
output_rect.height());
const gfx::Rect chroma_output_rect(0, 0, luma_output_rect.width() / 2,
luma_output_rect.height() / 2);
return (step1_.Scale(src_texture, src_texture_size, src_offset,
intermediate_texture_, output_rect) &&
step2_.Scale(intermediate_texture_, intermediate_texture_size_,
gfx::Vector2d(), yuv_textures[0], luma_output_rect) &&
step3_->Scale(intermediate_texture_, intermediate_texture_size_,
gfx::Vector2d(), yuv_textures[1], chroma_output_rect) &&
step4_->Scale(intermediate_texture_, intermediate_texture_size_,
gfx::Vector2d(), yuv_textures[2], chroma_output_rect));
}
// static
gfx::Rect GLI420Converter::ToAlignedRect(const gfx::Rect& rect) {
// Origin coordinates: FLOOR(...)
const int aligned_x =
((rect.x() < 0) ? ((rect.x() - 7) / 8) : (rect.x() / 8)) * 8;
const int aligned_y =
((rect.y() < 0) ? ((rect.y() - 1) / 2) : (rect.y() / 2)) * 2;
// Span coordinates: CEIL(...)
const int aligned_right =
((rect.right() < 0) ? (rect.right() / 8) : ((rect.right() + 7) / 8)) * 8;
const int aligned_bottom =
((rect.bottom() < 0) ? (rect.bottom() / 2) : ((rect.bottom() + 1) / 2)) *
2;
return gfx::Rect(aligned_x, aligned_y, aligned_right - aligned_x,
aligned_bottom - aligned_y);
}
// static
bool GLI420Converter::ParametersAreEquivalent(const Parameters& a,
const Parameters& b) {
const auto Resolve = [](Parameters params) {
// Per header comments, if an invalid output_color_space is specified, use
// REC709.
if (!params.output_color_space.IsValid()) {
params.output_color_space = gfx::ColorSpace::CreateREC709();
}
// Both of these fields are overwritten, in Configure(), whether the MRT
// path is going to be used or not. So, for the purposes of "equivalence,"
// just set these like the MRT path would.
params.export_format = Parameters::ExportFormat::NV61;
params.swizzle[1] = GL_RGBA;
return params;
};
return GLScaler::ParametersAreEquivalent(Resolve(a), Resolve(b));
}
void GLI420Converter::EnsureIntermediateTextureDefined(
const gfx::Size& required) {
if (intermediate_texture_size_ == required) {
return;
}
auto* const gl = context_provider_->ContextGL();
if (intermediate_texture_ == 0) {
gl->GenTextures(1, &intermediate_texture_);
}
gl->BindTexture(GL_TEXTURE_2D, intermediate_texture_);
gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, required.width(), required.height(),
0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
intermediate_texture_size_ = required;
}
void GLI420Converter::OnContextLost() {
if (intermediate_texture_ != 0) {
if (auto* gl = context_provider_->ContextGL()) {
gl->DeleteTextures(1, &intermediate_texture_);
}
intermediate_texture_ = 0;
intermediate_texture_size_ = gfx::Size();
}
if (context_provider_) {
context_provider_->RemoveObserver(this);
context_provider_ = nullptr;
}
}
} // namespace viz
|
