text: /*
   * Copyright 2011 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  
  
  #ifndef GrGLIRect_DEFINED
  #define GrGLIRect_DEFINED
  
  #include "gl/GrGLInterface.h"
  #include "GrGLUtil.h"
  
  /**
   * Helper struct for dealing with the fact that Ganesh and GL use different
   * window coordinate systems (top-down vs bottom-up)
   */
  struct GrGLIRect {
      GrGLint   fLeft;
      GrGLint   fBottom;
      GrGLsizei fWidth;
      GrGLsizei fHeight;
  
      void pushToGLViewport(const GrGLInterface* gl) const {
          GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight));
      }
  
      void pushToGLScissor(const GrGLInterface* gl) const {
          GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
      }
  
      void setFromGLViewport(const GrGLInterface* gl) {
          GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
          GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this);
      }
  
      // sometimes we have a SkIRect from the client that we
      // want to simultaneously make relative to GL's viewport
      // and (optionally) convert from top-down to bottom-up.
      void setRelativeTo(const GrGLIRect& glRect,
                         int leftOffset,
                         int topOffset,
                         int width,
                         int height,
                         GrSurfaceOrigin origin) {
          fLeft = glRect.fLeft + leftOffset;
          fWidth = width;
          if (kBottomLeft_GrSurfaceOrigin == origin) {
              fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height);
          } else {
              fBottom = glRect.fBottom + topOffset;
          }
          fHeight = height;
  
          SkASSERT(fLeft >= 0);
          SkASSERT(fWidth >= 0);
          SkASSERT(fBottom >= 0);
          SkASSERT(fHeight >= 0);
      }
  
      bool contains(const GrGLIRect& glRect) const {
          return fLeft <= glRect.fLeft &&
                 fBottom <= glRect.fBottom &&
                 fLeft + fWidth >=  glRect.fLeft + glRect.fWidth &&
                 fBottom + fHeight >=  glRect.fBottom + glRect.fHeight;
      }
  
      void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
  
      bool operator ==(const GrGLIRect& glRect) const {
          return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
      }
  
      bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
  };
  
  #endif
  