command_buffer: Implement path rendering functions for CHROMIUM_path_rendering

gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc

Index: gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
diff --git a/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc b/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
index 0cb575876b4e53dae1d2eb92e3ead751c599a548..9166b3386fede646d982fd917a7f79c7d41df6e0 100644
--- a/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
+++ b/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
@@ -12,6 +12,51 @@
 #include "third_party/khronos/GLES2/gl2ext.h"
 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 
+namespace {
+// Conversion functions from NV_path_rendering to CHROMIUM_path_rendering.
+// Coord type is not part of CHROMIUM_path_rendering, so DCHECK it to be
+// GL_FLOAT. Cover mode is not part of the extension either, but it's only
+// a perf flag, not a correctness flag. It can not be DCHECKed, as
+// GL_BOUNDING_BOX_NV is not a token in Chromium GL (in which this code is
+// compiled).
+GrGLvoid callPathCommandsCHROMIUM(GrGLuint path,
+                                  GrGLsizei num_commands,
+                                  const GrGLubyte* commands,
+                                  GrGLsizei num_coords,
+                                  GrGLenum coords_type,
+                                  const void* coords) {
+  DCHECK(coords_type == GL_FLOAT);
+  glPathCommandsCHROMIUM(path,
+                         num_commands,
+                         commands,
+                         num_coords,
+                         static_cast<const GLfloat*>(coords));
+}
+
+GrGLvoid callCoverFillPathCHROMIUM(GrGLuint path, GrGLenum /*cover_mode*/) {
+  glCoverFillPathCHROMIUM(path);
+}
+
+GrGLvoid callCoverStrokePathCHROMIUM(GrGLuint path, GrGLenum /*cover_mode*/) {
+  glCoverStrokePathCHROMIUM(path);
+}
+
+GrGLvoid callStencilThenCoverFillPathCHROMIUM(GrGLuint path,
+                                              GrGLenum fill_mode,
+                                              GrGLuint mask,
+                                              GrGLenum /*cover_mode*/) {
+  glStencilThenCoverFillPathCHROMIUM(path, fill_mode, mask);
+}
+
+GrGLvoid callStencilThenCoverStrokePathCHROMIUM(GrGLuint path,
+                                                GrGLint reference,
+                                                GrGLuint mask,
+                                                GrGLenum /*cover_mode*/) {
+  glStencilThenCoverStrokePathCHROMIUM(path, reference, mask);
+}
+
+}  // anonymous namespace
+
 namespace skia_bindings {
 
 GrGLInterface* CreateCommandBufferSkiaGLBinding() {
@@ -141,8 +186,26 @@ GrGLInterface* CreateCommandBufferSkiaGLBinding() {
   functions->fBindUniformLocation = glBindUniformLocationCHROMIUM;
   functions->fBlitFramebuffer = glBlitFramebufferCHROMIUM;
   functions->fGenerateMipmap = glGenerateMipmap;
-  functions->fMatrixLoadf = glMatrixLoadfCHROMIUM;
-  functions->fMatrixLoadIdentity = glMatrixLoadIdentityCHROMIUM;
+  if (false) {
+    // These are disabled until the full extension is implemented.
+    // Otherwise the interface fails validation and the context can not
+    // be created.
+    functions->fMatrixLoadf = glMatrixLoadfCHROMIUM;
+    functions->fMatrixLoadIdentity = glMatrixLoadIdentityCHROMIUM;
+    functions->fPathCommands = callPathCommandsCHROMIUM;
+    functions->fPathParameteri = glPathParameteriCHROMIUM;
+    functions->fPathParameterf = glPathParameterfCHROMIUM;
+    functions->fGenPaths = glGenPathsCHROMIUM;
+    functions->fDeletePaths = glDeletePathsCHROMIUM;
+    functions->fPathStencilFunc = glPathStencilFuncCHROMIUM;
+    functions->fStencilFillPath = glStencilFillPathCHROMIUM;
+    functions->fStencilStrokePath = glStencilStrokePathCHROMIUM;
+    functions->fCoverFillPath = callCoverFillPathCHROMIUM;
+    functions->fCoverStrokePath = callCoverStrokePathCHROMIUM;
+    functions->fStencilThenCoverFillPath = callStencilThenCoverFillPathCHROMIUM;
+    functions->fStencilThenCoverStrokePath =
+        callStencilThenCoverStrokePathCHROMIUM;
+  }
 
   return interface;
 }