git.sesse.net Git - casparcg/blob - core/mixer/image/image_kernel.cpp

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\r
   5 *\r
   6 *    CasparCG is free software: you can redistribute it and/or modify\r
   7 *    it under the terms of the GNU General Public License as published by\r
   8 *    the Free Software Foundation, either version 3 of the License, or\r
   9 *    (at your option) any later version.\r
  10 *\r
  11 *    CasparCG is distributed in the hope that it will be useful,\r
  12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 *    GNU General Public License for more details.\r
  15 \r
  16 *    You should have received a copy of the GNU General Public License\r
  17 *    along with CasparCG.  If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "image_kernel.h"\r
  23 \r
  24 #include "blending_glsl.h"\r
  25 #include "../gpu/shader.h"\r
  26 #include "../gpu/device_buffer.h"\r
  27 \r
  28 #include <common/exception/exceptions.h>\r
  29 #include <common/gl/gl_check.h>\r
  30 \r
  31 #include <core/video_format.h>\r
  32 #include <core/producer/frame/pixel_format.h>\r
  33 #include <core/producer/frame/image_transform.h>\r
  34 \r
  35 #include <GL/glew.h>\r
  36 \r
  37 #include <boost/noncopyable.hpp>\r
  38 \r
  39 #include <unordered_map>\r
  40 \r
  41 namespace caspar { namespace core {\r
  42         \r
  43 GLubyte upper_pattern[] = {\r
  44         0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,\r
  45         0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,\r
  46         0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,\r
  47         0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00};\r
  48                 \r
  49 GLubyte lower_pattern[] = {\r
  50         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, \r
  51         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,\r
  52         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,\r
  53         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};\r
  54 \r
  55 struct image_kernel::implementation : boost::noncopyable\r
  56 {       \r
  57         std::unique_ptr<shader> shader_;\r
  58         \r
  59         core::video_mode::type  last_mode_;\r
  60         size_t                                  last_width_;\r
  61         size_t                                  last_height_;\r
  62         \r
  63         std::string get_blend_color_func()\r
  64         {\r
  65                 return \r
  66                         \r
  67                 get_blend_glsl()\r
  68                 \r
  69                 +\r
  70                         \r
  71                 "vec3 get_blend_color(vec3 back, vec3 fore)                                                                                     \n"\r
  72                 "{                                                                                                                                                                      \n"\r
  73                 "       switch(blend_mode)                                                                                                                              \n"\r
  74                 "       {                                                                                                                                                               \n"\r
  75                 "       case  0: return BlendNormal(back, fore);                                                                                \n"\r
  76                 "       case  1: return BlendLighten(back, fore);                                                                               \n"\r
  77                 "       case  2: return BlendDarken(back, fore);                                                                                \n"\r
  78                 "       case  3: return BlendMultiply(back, fore);                                                                              \n"\r
  79                 "       case  4: return BlendAverage(back, fore);                                                                               \n"\r
  80                 "       case  5: return BlendAdd(back, fore);                                                                                   \n"\r
  81                 "       case  6: return BlendSubstract(back, fore);                                                                             \n"\r
  82                 "       case  7: return BlendDifference(back, fore);                                                                    \n"\r
  83                 "       case  8: return BlendNegation(back, fore);                                                                              \n"\r
  84                 "       case  9: return BlendExclusion(back, fore);                                                                             \n"\r
  85                 "       case 10: return BlendScreen(back, fore);                                                                                \n"\r
  86                 "       case 11: return BlendOverlay(back, fore);                                                                               \n"\r
  87                 //"     case 12: return BlendSoftLight(back, fore);                                                                             \n"\r
  88                 "       case 13: return BlendHardLight(back, fore);                                                                             \n"\r
  89                 "       case 14: return BlendColorDodge(back, fore);                                                                    \n"\r
  90                 "       case 15: return BlendColorBurn(back, fore);                                                                             \n"\r
  91                 "       case 16: return BlendLinearDodge(back, fore);                                                                   \n"\r
  92                 "       case 17: return BlendLinearBurn(back, fore);                                                                    \n"\r
  93                 "       case 18: return BlendLinearLight(back, fore);                                                                   \n"\r
  94                 "       case 19: return BlendVividLight(back, fore);                                                                    \n"\r
  95                 "       case 20: return BlendPinLight(back, fore);                                                                              \n"\r
  96                 "       case 21: return BlendHardMix(back, fore);                                                                               \n"\r
  97                 "       case 22: return BlendReflect(back, fore);                                                                               \n"\r
  98                 "       case 23: return BlendGlow(back, fore);                                                                                  \n"\r
  99                 "       case 24: return BlendPhoenix(back, fore);                                                                               \n"\r
 100                 "       case 25: return BlendHue(back, fore);                                                                                   \n"\r
 101                 "       case 26: return BlendSaturation(back, fore);                                                                    \n"\r
 102                 "       case 27: return BlendColor(back, fore);                                                                                 \n"\r
 103                 "       case 28: return BlendLuminosity(back, fore);                                                                    \n"\r
 104                 "       }                                                                                                                                                               \n"\r
 105                 "       return BlendNormal(back, fore);                                                                                                 \n"\r
 106                 "}                                                                                                                                                                      \n"\r
 107                 "                                                                                                                                                                       \n"                                                                                                                                                       \r
 108                 "vec4 blend_color(vec4 fore)                                                                                                            \n"\r
 109                 "{                                                                                                                                                                      \n"\r
 110                 "   vec4 back = texture2D(background, gl_TexCoord[1].st);                                                       \n"\r
 111                 "   if(levels)                                                                                                                                          \n"\r
 112                 "               fore.rgb = LevelsControl(fore.rgb, min_input, max_input, gamma, min_output, max_output); \n"\r
 113                 "       if(csb)                                                                                                                                                 \n"\r
 114                 "               fore.rgb = ContrastSaturationBrightness(fore.rgb, brt, sat, con);                       \n"\r
 115                 "   fore.rgb = get_blend_color(back.bgr, fore.rgb);                                                                     \n"\r
 116                 "                                                                                                                                                                       \n"\r
 117                 "       return vec4(mix(back.rgb, fore.rgb, fore.a), back.a + fore.a);                                  \n"\r
 118                 "}                                                                                                                                                                      \n";\r
 119         }\r
 120                 \r
 121         std::string get_simple_blend_color_func()\r
 122         {\r
 123                 return  \r
 124 \r
 125                 "vec4 blend_color(vec4 fore)                                                                                                            \n"\r
 126                 "{                                                                                                                                                                      \n"\r
 127                 "   vec4 back = texture2D(background, gl_TexCoord[1].st);                                                       \n"\r
 128                 "       return vec4(mix(back.rgb, fore.rgb, fore.a), back.a + fore.a);                                  \n"\r
 129                 "}                                                                                                                                                                      \n";\r
 130         }\r
 131 \r
 132         std::string get_vertex()\r
 133         {\r
 134                 return \r
 135 \r
 136                 "void main()                                                                                                                                            \n"\r
 137                 "{                                                                                                                                                                      \n"\r
 138                 "       gl_TexCoord[0] = gl_MultiTexCoord0;                                                                                             \n"\r
 139                 "       gl_TexCoord[1] = gl_MultiTexCoord1;                                                                                             \n"\r
 140                 "       gl_FrontColor  = gl_Color;                                                                                                              \n"\r
 141                 "       gl_Position    = ftransform();                                                                                                  \n"\r
 142                 "}                                                                                                                                                                      \n";\r
 143         }\r
 144 \r
 145         std::string get_fragment(bool compability_mode)\r
 146         {\r
 147                 return\r
 148 \r
 149                 "#version 120                                                                                                                                           \n"\r
 150                 "uniform sampler2D      background;                                                                                                             \n"\r
 151                 "uniform sampler2D      plane[4];                                                                                                               \n"\r
 152                 "uniform sampler2D      local_key;                                                                                                              \n"\r
 153                 "uniform sampler2D      layer_key;                                                                                                              \n"\r
 154                 "                                                                                                                                                                       \n"\r
 155                 "uniform bool           is_hd;                                                                                                                  \n"\r
 156                 "uniform bool           has_local_key;                                                                                                  \n"\r
 157                 "uniform bool           has_layer_key;                                                                                                  \n"\r
 158                 "uniform int            blend_mode;                                                                                                             \n"\r
 159                 "uniform int            alpha_mode;                                                                                                             \n"\r
 160                 "uniform int            pixel_format;                                                                                                   \n"\r
 161                 "                                                                                                                                                                       \n"\r
 162                 "uniform bool           levels;                                                                                                                 \n"\r
 163                 "uniform float          min_input;                                                                                                              \n"\r
 164                 "uniform float          max_input;                                                                                                              \n"\r
 165                 "uniform float          gamma;                                                                                                                  \n"\r
 166                 "uniform float          min_output;                                                                                                             \n"\r
 167                 "uniform float          max_output;                                                                                                             \n"\r
 168                 "                                                                                                                                                                       \n"\r
 169                 "uniform bool           csb;                                                                                                                    \n"\r
 170                 "uniform float          brt;                                                                                                                    \n"\r
 171                 "uniform float          sat;                                                                                                                    \n"\r
 172                 "uniform float          con;                                                                                                                    \n"\r
 173                 "                                                                                                                                                                       \n"\r
 174 \r
 175                 +\r
 176 \r
 177                 (compability_mode ? get_simple_blend_color_func() : get_blend_color_func())\r
 178                 \r
 179                 +\r
 180 \r
 181                 "                                                                                                                                                                       \n"\r
 182                 "// NOTE: YCbCr, ITU-R, http://www.intersil.com/data/an/an9717.pdf                                      \n"\r
 183                 "// TODO: Support for more yuv formats might be needed.                                                         \n"\r
 184                 "vec4 ycbcra_to_rgba_sd(float y, float cb, float cr, float a)                                           \n"\r
 185                 "{                                                                                                                                                                      \n"\r
 186                 "       cb -= 0.5;                                                                                                                                              \n"\r
 187                 "       cr -= 0.5;                                                                                                                                              \n"\r
 188                 "       y = 1.164*(y-0.0625);                                                                                                                   \n"\r
 189                 "                                                                                                                                                                       \n"\r
 190                 "       vec4 color;                                                                                                                                             \n"\r
 191                 "       color.r = y + 2.018 * cb;                                                                                                               \n"\r
 192                 "       color.b = y + 1.596 * cr;                                                                                                               \n"\r
 193                 "       color.g = y - 0.813 * cr - 0.391 * cb;                                                                                  \n"\r
 194                 "       color.a = a;                                                                                                                                    \n"\r
 195                 "                                                                                                                                                                       \n"\r
 196                 "       return color;                                                                                                                                   \n"\r
 197                 "}                                                                                                                                                                      \n"                     \r
 198                 "                                                                                                                                                                       \n"\r
 199                 "vec4 ycbcra_to_rgba_hd(float y, float cb, float cr, float a)                                           \n"\r
 200                 "{                                                                                                                                                                      \n"\r
 201                 "       cb -= 0.5;                                                                                                                                              \n"\r
 202                 "       cr -= 0.5;                                                                                                                                              \n"\r
 203                 "       y = 1.164*(y-0.0625);                                                                                                                   \n"\r
 204                 "                                                                                                                                                                       \n"\r
 205                 "       vec4 color;                                                                                                                                             \n"\r
 206                 "       color.r = y + 2.115 * cb;                                                                                                               \n"\r
 207                 "       color.b = y + 1.793 * cr;                                                                                                               \n"\r
 208                 "       color.g = y - 0.534 * cr - 0.213 * cb;                                                                                  \n"\r
 209                 "       color.a = a;                                                                                                                                    \n"\r
 210                 "                                                                                                                                                                       \n"\r
 211                 "       return color;                                                                                                                                   \n"\r
 212                 "}                                                                                                                                                                      \n"                     \r
 213                 "                                                                                                                                                                       \n"                     \r
 214                 "vec4 ycbcra_to_rgba(float y, float cb, float cr, float a)                                                      \n"\r
 215                 "{                                                                                                                                                                      \n"\r
 216                 "       if(is_hd)                                                                                                                                               \n"\r
 217                 "               return ycbcra_to_rgba_hd(y, cb, cr, a);                                                                         \n"\r
 218                 "       else                                                                                                                                                    \n"\r
 219                 "               return ycbcra_to_rgba_sd(y, cb, cr, a);                                                                         \n"\r
 220                 "}                                                                                                                                                                      \n"\r
 221                 "                                                                                                                                                                       \n"\r
 222                 "vec4 get_rgba_color()                                                                                                                          \n"\r
 223                 "{                                                                                                                                                                      \n"\r
 224                 "       switch(pixel_format)                                                                                                                    \n"\r
 225                 "       {                                                                                                                                                               \n"\r
 226                 "       case 0:         //gray                                                                                                                          \n"\r
 227                 "               return vec4(texture2D(plane[0], gl_TexCoord[0].st).rrr, 1.0);                           \n"\r
 228                 "       case 1:         //bgra,                                                                                                                         \n"\r
 229                 "               return texture2D(plane[0], gl_TexCoord[0].st).bgra;                                                     \n"\r
 230                 "       case 2:         //rgba,                                                                                                                         \n"\r
 231                 "               return texture2D(plane[0], gl_TexCoord[0].st).rgba;                                                     \n"\r
 232                 "       case 3:         //argb,                                                                                                                         \n"\r
 233                 "               return texture2D(plane[0], gl_TexCoord[0].st).argb;                                                     \n"\r
 234                 "       case 4:         //abgr,                                                                                                                         \n"\r
 235                 "               return texture2D(plane[0], gl_TexCoord[0].st).gbar;                                                     \n"\r
 236                 "       case 5:         //ycbcr,                                                                                                                        \n"\r
 237                 "               {                                                                                                                                                       \n"\r
 238                 "                       float y  = texture2D(plane[0], gl_TexCoord[0].st).r;                                    \n"\r
 239                 "                       float cb = texture2D(plane[1], gl_TexCoord[0].st).r;                                    \n"\r
 240                 "                       float cr = texture2D(plane[2], gl_TexCoord[0].st).r;                                    \n"\r
 241                 "                       return ycbcra_to_rgba(y, cb, cr, 1.0);                                                                  \n"\r
 242                 "               }                                                                                                                                                       \n"\r
 243                 "       case 6:         //ycbcra                                                                                                                        \n"\r
 244                 "               {                                                                                                                                                       \n"\r
 245                 "                       float y  = texture2D(plane[0], gl_TexCoord[0].st).r;                                    \n"\r
 246                 "                       float cb = texture2D(plane[1], gl_TexCoord[0].st).r;                                    \n"\r
 247                 "                       float cr = texture2D(plane[2], gl_TexCoord[0].st).r;                                    \n"\r
 248                 "                       float a  = texture2D(plane[3], gl_TexCoord[0].st).r;                                    \n"\r
 249                 "                       return ycbcra_to_rgba(y, cb, cr, a);                                                                    \n"\r
 250                 "               }                                                                                                                                                       \n"\r
 251                 "       }                                                                                                                                                               \n"\r
 252                 "       return vec4(0.0, 0.0, 0.0, 0.0);                                                                                                \n"\r
 253                 "}                                                                                                                                                                      \n"\r
 254                 "                                                                                                                                                                       \n"\r
 255                 "void main()                                                                                                                                            \n"\r
 256                 "{                                                                                                                                                                      \n"\r
 257                 "       vec4 color = get_rgba_color();                                                                                                  \n"\r
 258                 "       if(has_local_key)                                                                                                                               \n"\r
 259                 "               color.a *= texture2D(local_key, gl_TexCoord[1].st).r;                                           \n"\r
 260                 "       if(has_layer_key)                                                                                                                               \n"\r
 261                 "               color.a *= texture2D(layer_key, gl_TexCoord[1].st).r;                                           \n"\r
 262                 "       gl_FragColor = blend_color(color.bgra * gl_Color);                                                              \n"\r
 263                 "}                                                                                                                                                                      \n";\r
 264         }\r
 265 \r
 266 \r
 267         implementation() \r
 268                 : last_mode_(core::video_mode::progressive)\r
 269                 , last_width_(0)\r
 270                 , last_height_(0)\r
 271         {                       \r
 272         }\r
 273 \r
 274         \r
 275         void draw(const render_item&                                                    item,\r
 276                           const safe_ptr<device_buffer>&                                background,\r
 277                           const std::shared_ptr<device_buffer>&                 local_key,                        \r
 278                           const std::shared_ptr<device_buffer>&                 layer_key)\r
 279         {\r
 280                 static const double epsilon = 0.001;\r
 281 \r
 282                 CASPAR_ASSERT(item.pix_desc.planes.size() == item.textures.size());\r
 283 \r
 284                 if(item.textures.empty())\r
 285                         return;\r
 286 \r
 287                 if(item.transform.get_opacity() < epsilon)\r
 288                         return;\r
 289 \r
 290                 if(!shader_)\r
 291                 {\r
 292                         try\r
 293                         {\r
 294                                 shader_.reset(new shader(get_vertex(), get_fragment(false)));\r
 295                         }\r
 296                         catch(...)\r
 297                         {\r
 298                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 299                                 CASPAR_LOG(warning) << "Failed to compile shader. Trying to compile without blend-modes.";\r
 300                                 shader_.reset(new shader(get_vertex(), get_fragment(true)));\r
 301                         }\r
 302 \r
 303                         GL(glEnable(GL_TEXTURE_2D));\r
 304                 }\r
 305 \r
 306                 if(last_mode_ != item.mode)\r
 307                 {\r
 308                         last_mode_ = item.mode;\r
 309                         \r
 310                         if(item.mode == core::video_mode::progressive)                  \r
 311                                 GL(glDisable(GL_POLYGON_STIPPLE));                      \r
 312                         else                    \r
 313                         {\r
 314                                 GL(glEnable(GL_POLYGON_STIPPLE));                       \r
 315 \r
 316                                 if(item.mode == core::video_mode::upper)\r
 317                                         glPolygonStipple(upper_pattern);\r
 318                                 else if(item.mode == core::video_mode::lower)\r
 319                                         glPolygonStipple(lower_pattern);\r
 320                         }\r
 321                 }\r
 322 \r
 323                 if(last_width_ != background->width() || last_height_ != background->height())\r
 324                 {\r
 325                         last_width_ = background->width();\r
 326                         last_height_ = background->height();\r
 327                         GL(glViewport(0, 0, background->width(), background->height()));\r
 328                 }\r
 329 \r
 330                 // Bind textures\r
 331 \r
 332                 for(size_t n = 0; n < item.textures.size(); ++n)\r
 333                         item.textures[n]->bind(n);\r
 334 \r
 335                 if(local_key)\r
 336                         local_key->bind(4);\r
 337                 \r
 338                 if(layer_key)\r
 339                         layer_key->bind(5);\r
 340 \r
 341                 background->bind(6);\r
 342 \r
 343                 // Setup shader\r
 344 \r
 345                 shader_->use(); \r
 346 \r
 347                 shader_->set("plane[0]",                0);\r
 348                 shader_->set("plane[1]",                1);\r
 349                 shader_->set("plane[2]",                2);\r
 350                 shader_->set("plane[3]",                3);\r
 351                 shader_->set("local_key",               4);\r
 352                 shader_->set("layer_key",               5);\r
 353                 shader_->set("background",              6);\r
 354                 shader_->set("is_hd",                   item.pix_desc.planes.at(0).height > 700 ? 1 : 0);\r
 355                 shader_->set("has_local_key",   local_key ? 1 : 0);\r
 356                 shader_->set("has_layer_key",   layer_key ? 1 : 0);\r
 357                 shader_->set("blend_mode",              item.transform.get_is_key() ? core::image_transform::blend_mode::normal : item.transform.get_blend_mode());\r
 358                 shader_->set("alpha_mode",              item.transform.get_alpha_mode());\r
 359                 shader_->set("pixel_format",    item.pix_desc.pix_fmt); \r
 360 \r
 361                 auto levels = item.transform.get_levels();\r
 362 \r
 363                 if(levels.min_input  > epsilon          ||\r
 364                    levels.max_input  < 1.0-epsilon      ||\r
 365                    levels.min_output > epsilon          ||\r
 366                    levels.max_output < 1.0-epsilon      ||\r
 367                    std::abs(levels.gamma - 1.0) > epsilon)\r
 368                 {\r
 369                         shader_->set("levels", true);   \r
 370                         shader_->set("min_input", levels.min_input);    \r
 371                         shader_->set("max_input", levels.max_input);\r
 372                         shader_->set("min_output", levels.min_output);\r
 373                         shader_->set("max_output", levels.max_output);\r
 374                         shader_->set("gamma", levels.gamma);\r
 375                 }\r
 376                 else\r
 377                         shader_->set("levels", false);  \r
 378 \r
 379                 if(std::abs(item.transform.get_brightness() - 1.0) > epsilon ||\r
 380                    std::abs(item.transform.get_saturation() - 1.0) > epsilon ||\r
 381                    std::abs(item.transform.get_contrast() - 1.0) > epsilon)\r
 382                 {\r
 383                         shader_->set("csb",     true);  \r
 384                         \r
 385                         shader_->set("brt", item.transform.get_brightness());   \r
 386                         shader_->set("sat", item.transform.get_saturation());\r
 387                         shader_->set("con", item.transform.get_contrast());\r
 388                 }\r
 389                 else\r
 390                         shader_->set("csb",     false); \r
 391                 \r
 392                 // Setup drawing area\r
 393 \r
 394                 GL(glColor4d(item.transform.get_gain(), item.transform.get_gain(), item.transform.get_gain(), item.transform.get_opacity()));\r
 395                                                 \r
 396                 auto m_p = item.transform.get_clip_translation();\r
 397                 auto m_s = item.transform.get_clip_scale();\r
 398                 double w = static_cast<double>(background->width());\r
 399                 double h = static_cast<double>(background->height());\r
 400 \r
 401                 GL(glEnable(GL_SCISSOR_TEST));\r
 402                 GL(glScissor(static_cast<size_t>(m_p[0]*w), static_cast<size_t>(m_p[1]*h), static_cast<size_t>(m_s[0]*w), static_cast<size_t>(m_s[1]*h)));\r
 403                         \r
 404                 auto f_p = item.transform.get_fill_translation();\r
 405                 auto f_s = item.transform.get_fill_scale();\r
 406                 \r
 407                 // Draw\r
 408 \r
 409                 glBegin(GL_QUADS);\r
 410                         glMultiTexCoord2d(GL_TEXTURE0, 0.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1,  f_p[0]        ,  f_p[1]        );             glVertex2d( f_p[0]        *2.0-1.0,  f_p[1]        *2.0-1.0);\r
 411                         glMultiTexCoord2d(GL_TEXTURE0, 1.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]),  f_p[1]        );             glVertex2d((f_p[0]+f_s[0])*2.0-1.0,  f_p[1]        *2.0-1.0);\r
 412                         glMultiTexCoord2d(GL_TEXTURE0, 1.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), (f_p[1]+f_s[1]));             glVertex2d((f_p[0]+f_s[0])*2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 413                         glMultiTexCoord2d(GL_TEXTURE0, 0.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1,  f_p[0]        , (f_p[1]+f_s[1]));             glVertex2d( f_p[0]        *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 414                 glEnd();\r
 415 \r
 416                 GL(glDisable(GL_SCISSOR_TEST)); \r
 417         }\r
 418 };\r
 419 \r
 420 image_kernel::image_kernel() : impl_(new implementation()){}\r
 421 void image_kernel::draw(const render_item& item, const safe_ptr<device_buffer>& background, const std::shared_ptr<device_buffer>& local_key, const std::shared_ptr<device_buffer>& layer_key)\r
 422 {\r
 423         impl_->draw(item, background, local_key, layer_key);\r
 424 }\r
 425 \r
 426 bool operator==(const render_item& lhs, const render_item& rhs)\r
 427 {\r
 428         return lhs.textures == rhs.textures && lhs.transform == rhs.transform && lhs.tag == rhs.tag && lhs.mode == rhs.mode;\r
 429 }\r
 430 \r
 431 }}