2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG (www.casparcg.com).
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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19 * Author: Robert Nagy, ronag89@gmail.com
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21 #include "../../stdafx.h"
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23 #include "image_mixer.h"
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25 #include "image_kernel.h"
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27 #include "../util/device.h"
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28 #include "../util/buffer.h"
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29 #include "../util/texture.h"
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31 #include <common/gl/gl_check.h>
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32 #include <common/concurrency/async.h>
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33 #include <common/memory/array.h>
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35 #include <core/frame/frame.h>
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36 #include <core/frame/frame_transform.h>
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37 #include <core/frame/pixel_format.h>
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38 #include <core/video_format.h>
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42 #include <gl/glew.h>
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44 #include <boost/foreach.hpp>
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45 #include <boost/range/algorithm_ext/erase.hpp>
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46 #include <boost/thread/future.hpp>
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48 #include <algorithm>
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51 using namespace boost::assign;
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53 namespace caspar { namespace accelerator { namespace ogl {
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55 typedef boost::shared_future<spl::shared_ptr<texture>> future_texture;
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59 core::pixel_format_desc pix_desc;
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60 core::field_mode field_mode;
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61 std::vector<future_texture> textures;
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62 core::image_transform transform;
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65 : pix_desc(core::pixel_format::invalid)
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66 , field_mode(core::field_mode::empty)
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73 std::vector<item> items;
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74 core::blend_mode blend_mode;
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77 : blend_mode(core::blend_mode::normal)
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81 layer(std::vector<item> items, core::blend_mode blend_mode)
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82 : items(std::move(items))
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83 , blend_mode(blend_mode)
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88 class image_renderer
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90 spl::shared_ptr<device> ogl_;
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91 image_kernel kernel_;
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93 image_renderer(const spl::shared_ptr<device>& ogl)
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99 boost::unique_future<core::const_array> operator()(std::vector<layer> layers, const core::video_format_desc& format_desc)
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102 { // Bypass GPU with empty frame.
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103 auto buffer = spl::make_shared<const std::vector<uint8_t, tbb::cache_aligned_allocator<uint8_t>>>(format_desc.size, 0);
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104 return async(launch_policy::deferred, [=]
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106 return core::const_array(buffer->data(), static_cast<std::size_t>(format_desc.size), buffer);
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110 return fold(ogl_->begin_invoke([=]() mutable -> boost::shared_future<core::const_array>
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112 auto draw_buffer = create_mixer_buffer(format_desc.width, format_desc.height, 4);
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114 if(format_desc.field_mode != core::field_mode::progressive)
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116 draw(layers, draw_buffer, format_desc, core::field_mode::upper);
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117 draw(std::move(layers), draw_buffer, format_desc, core::field_mode::lower);
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120 draw(std::move(layers), draw_buffer, format_desc, core::field_mode::progressive);
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122 return make_shared(ogl_->copy_async(draw_buffer));
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128 void draw(std::vector<layer> layers,
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129 spl::shared_ptr<texture>& draw_buffer,
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130 const core::video_format_desc& format_desc,
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131 core::field_mode field_mode)
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133 std::shared_ptr<texture> layer_key_buffer;
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135 BOOST_FOREACH(auto& layer, layers)
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136 draw_layer(std::move(layer), draw_buffer, layer_key_buffer, format_desc, field_mode);
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139 void draw_layer(layer layer,
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140 spl::shared_ptr<texture>& draw_buffer,
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141 std::shared_ptr<texture>& layer_key_buffer,
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142 const core::video_format_desc& format_desc,
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143 core::field_mode field_mode)
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146 BOOST_FOREACH(auto& item, layer.items)
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148 if(item.pix_desc.planes.at(0).height == 480) // NTSC DV
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150 item.transform.fill_translation[1] += 2.0/static_cast<double>(format_desc.height);
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151 item.transform.fill_scale[1] = 1.0 - 6.0*1.0/static_cast<double>(format_desc.height);
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154 // Fix field-order if needed
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155 if(item.field_mode == core::field_mode::lower && format_desc.field_mode == core::field_mode::upper)
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156 item.transform.fill_translation[1] += 1.0/static_cast<double>(format_desc.height);
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157 else if(item.field_mode == core::field_mode::upper && format_desc.field_mode == core::field_mode::lower)
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158 item.transform.fill_translation[1] -= 1.0/static_cast<double>(format_desc.height);
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162 BOOST_FOREACH(auto& item, layer.items)
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163 item.transform.field_mode &= field_mode;
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165 // Remove empty items.
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166 boost::range::remove_erase_if(layer.items, [&](const item& item)
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168 return item.transform.field_mode == core::field_mode::empty;
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171 // Remove first field stills.
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172 boost::range::remove_erase_if(layer.items, [&](const item& item)
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174 return item.transform.is_still && item.transform.field_mode == format_desc.field_mode; // only use last field for stills.
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177 if(layer.items.empty())
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180 std::shared_ptr<texture> local_key_buffer;
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181 std::shared_ptr<texture> local_mix_buffer;
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183 if(layer.blend_mode != core::blend_mode::normal)
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185 auto layer_draw_buffer = create_mixer_buffer(draw_buffer->width(), draw_buffer->height(), 4);
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187 BOOST_FOREACH(auto& item, layer.items)
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188 draw_item(std::move(item), layer_draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);
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190 draw_mixer_buffer(layer_draw_buffer, std::move(local_mix_buffer), core::blend_mode::normal);
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191 draw_mixer_buffer(draw_buffer, std::move(layer_draw_buffer), layer.blend_mode);
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195 BOOST_FOREACH(auto& item, layer.items)
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196 draw_item(std::move(item), draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);
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198 draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), core::blend_mode::normal);
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201 layer_key_buffer = std::move(local_key_buffer);
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204 void draw_item(item item,
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205 spl::shared_ptr<texture>& draw_buffer,
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206 std::shared_ptr<texture>& layer_key_buffer,
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207 std::shared_ptr<texture>& local_key_buffer,
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208 std::shared_ptr<texture>& local_mix_buffer)
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210 draw_params draw_params;
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211 draw_params.pix_desc = std::move(item.pix_desc);
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212 draw_params.transform = std::move(item.transform);
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213 BOOST_FOREACH(auto& future_texture, item.textures)
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214 draw_params.textures.push_back(future_texture.get());
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216 if(item.transform.is_key)
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218 local_key_buffer = local_key_buffer ? local_key_buffer : create_mixer_buffer(draw_buffer->width(), draw_buffer->height(), 1);
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220 draw_params.background = local_key_buffer;
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221 draw_params.local_key = nullptr;
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222 draw_params.layer_key = nullptr;
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224 kernel_.draw(std::move(draw_params));
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226 else if(item.transform.is_mix)
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228 local_mix_buffer = local_mix_buffer ? local_mix_buffer : create_mixer_buffer(draw_buffer->width(), draw_buffer->height(), 4);
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230 draw_params.background = local_mix_buffer;
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231 draw_params.local_key = std::move(local_key_buffer);
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232 draw_params.layer_key = layer_key_buffer;
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234 draw_params.keyer = keyer::additive;
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236 kernel_.draw(std::move(draw_params));
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240 draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), core::blend_mode::normal);
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242 draw_params.background = draw_buffer;
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243 draw_params.local_key = std::move(local_key_buffer);
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244 draw_params.layer_key = layer_key_buffer;
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246 kernel_.draw(std::move(draw_params));
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250 void draw_mixer_buffer(spl::shared_ptr<texture>& draw_buffer,
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251 std::shared_ptr<texture>&& source_buffer,
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252 core::blend_mode blend_mode = core::blend_mode::normal)
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257 draw_params draw_params;
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258 draw_params.pix_desc.format = core::pixel_format::bgra;
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259 draw_params.pix_desc.planes = list_of(core::pixel_format_desc::plane(source_buffer->width(), source_buffer->height(), 4));
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260 draw_params.textures = list_of(source_buffer);
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261 draw_params.transform = core::image_transform();
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262 draw_params.blend_mode = blend_mode;
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263 draw_params.background = draw_buffer;
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265 kernel_.draw(std::move(draw_params));
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268 spl::shared_ptr<texture> create_mixer_buffer(int width, int height, int stride)
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270 auto buffer = ogl_->create_texture(width, height, stride);
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276 struct image_mixer::impl : boost::noncopyable
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278 spl::shared_ptr<device> ogl_;
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279 image_renderer renderer_;
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280 std::vector<core::image_transform> transform_stack_;
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281 std::vector<layer> layers_; // layer/stream/items
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283 impl(const spl::shared_ptr<device>& ogl)
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286 , transform_stack_(1)
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288 CASPAR_LOG(info) << L"Initialized OpenGL Accelerated GPU Image Mixer";
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291 void begin_layer(core::blend_mode blend_mode)
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293 layers_.push_back(layer(std::vector<item>(), blend_mode));
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296 void push(const core::frame_transform& transform)
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298 transform_stack_.push_back(transform_stack_.back()*transform.image_transform);
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301 void visit(const core::mutable_frame& frame)
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303 if(frame.pixel_format_desc().format == core::pixel_format::invalid)
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306 if(frame.pixel_format_desc().planes.empty())
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309 if(transform_stack_.back().field_mode == core::field_mode::empty)
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313 item.pix_desc = frame.pixel_format_desc();
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314 item.field_mode = frame.field_mode();
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315 item.transform = transform_stack_.back();
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316 for(int n = 0; n < static_cast<int>(item.pix_desc.planes.size()); ++n)
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317 item.textures.push_back(ogl_->copy_async(frame.image_data(n), item.pix_desc.planes[n].width, item.pix_desc.planes[n].height, item.pix_desc.planes[n].stride));
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319 layers_.back().items.push_back(item);
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324 transform_stack_.pop_back();
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331 boost::unique_future<core::const_array> render(const core::video_format_desc& format_desc)
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333 return renderer_(std::move(layers_), format_desc);
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336 virtual core::mutable_frame create_frame(const void* tag, const core::pixel_format_desc& desc, double frame_rate, core::field_mode field_mode)
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338 std::vector<core::mutable_array> buffers;
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339 BOOST_FOREACH(auto& plane, desc.planes)
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340 buffers.push_back(ogl_->create_array(plane.size));
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342 return core::mutable_frame(std::move(buffers), core::audio_buffer(), tag, desc, frame_rate, field_mode);
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346 image_mixer::image_mixer(const spl::shared_ptr<device>& ogl) : impl_(new impl(ogl)){}
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347 image_mixer::~image_mixer(){}
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348 void image_mixer::push(const core::frame_transform& transform){impl_->push(transform);}
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349 void image_mixer::visit(const core::mutable_frame& frame){impl_->visit(frame);}
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350 void image_mixer::pop(){impl_->pop();}
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351 boost::unique_future<core::const_array> image_mixer::operator()(const core::video_format_desc& format_desc){return impl_->render(format_desc);}
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352 void image_mixer::begin_layer(core::blend_mode blend_mode){impl_->begin_layer(blend_mode);}
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353 void image_mixer::end_layer(){impl_->end_layer();}
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354 core::mutable_frame image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc, double frame_rate, core::field_mode field_mode) {return impl_->create_frame(tag, desc, frame_rate, field_mode);}
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