Line data    Source code

       1             : /*
       2             :  * Copyright 2011 Google Inc.
       3             :  *
       4             :  * Use of this source code is governed by a BSD-style license that can be
       5             :  * found in the LICENSE file.
       6             :  */
       7             : 
       8             : 
       9             : 
      10             : #ifndef GrGLIRect_DEFINED
      11             : #define GrGLIRect_DEFINED
      12             : 
      13             : #include "gl/GrGLInterface.h"
      14             : #include "GrGLUtil.h"
      15             : 
      16             : /**
      17             :  * Helper struct for dealing with the fact that Ganesh and GL use different
      18             :  * window coordinate systems (top-down vs bottom-up)
      19             :  */
      20             : struct GrGLIRect {
      21             :     GrGLint   fLeft;
      22             :     GrGLint   fBottom;
      23             :     GrGLsizei fWidth;
      24             :     GrGLsizei fHeight;
      25             : 
      26             :     /**
      27             :      *  cast-safe way to treat the rect as an array of (4) ints.
      28             :      */
      29             :     const int* asInts() const {
      30             :         return &fLeft;
      31             : 
      32             :         GR_STATIC_ASSERT(0 == offsetof(GrGLIRect, fLeft));
      33             :         GR_STATIC_ASSERT(4 == offsetof(GrGLIRect, fBottom));
      34             :         GR_STATIC_ASSERT(8 == offsetof(GrGLIRect, fWidth));
      35             :         GR_STATIC_ASSERT(12 == offsetof(GrGLIRect, fHeight));
      36             :         GR_STATIC_ASSERT(16 == sizeof(GrGLIRect)); // For an array of GrGLIRect.
      37             :     }
      38           0 :     int* asInts() { return &fLeft; }
      39             : 
      40           0 :     void pushToGLViewport(const GrGLInterface* gl) const {
      41           0 :         GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight));
      42           0 :     }
      43             : 
      44           0 :     void pushToGLScissor(const GrGLInterface* gl) const {
      45           0 :         GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
      46           0 :     }
      47             : 
      48             :     void setFromGLViewport(const GrGLInterface* gl) {
      49             :         GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
      50             :         GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this);
      51             :     }
      52             : 
      53             :     // sometimes we have a SkIRect from the client that we
      54             :     // want to simultaneously make relative to GL's viewport
      55             :     // and (optionally) convert from top-down to bottom-up.
      56           0 :     void setRelativeTo(const GrGLIRect& glViewport, const SkIRect& devRect, GrSurfaceOrigin org) {
      57           0 :         this->setRelativeTo(glViewport, devRect.x(), devRect.y(), devRect.width(), devRect.height(),
      58           0 :                             org);
      59           0 :     }
      60             : 
      61           0 :     void setRelativeTo(const GrGLIRect& glRect,
      62             :                        int leftOffset,
      63             :                        int topOffset,
      64             :                        int width,
      65             :                        int height,
      66             :                        GrSurfaceOrigin origin) {
      67           0 :         fLeft = glRect.fLeft + leftOffset;
      68           0 :         fWidth = width;
      69           0 :         if (kBottomLeft_GrSurfaceOrigin == origin) {
      70           0 :             fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height);
      71             :         } else {
      72           0 :             fBottom = glRect.fBottom + topOffset;
      73             :         }
      74           0 :         fHeight = height;
      75             : 
      76           0 :         SkASSERT(fWidth >= 0);
      77           0 :         SkASSERT(fHeight >= 0);
      78           0 :     }
      79             : 
      80           0 :     bool contains(const GrGLIRect& glRect) const {
      81           0 :         return fLeft <= glRect.fLeft &&
      82           0 :                fBottom <= glRect.fBottom &&
      83           0 :                fLeft + fWidth >=  glRect.fLeft + glRect.fWidth &&
      84           0 :                fBottom + fHeight >=  glRect.fBottom + glRect.fHeight;
      85             :     }
      86             : 
      87           0 :     void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
      88             : 
      89           0 :     bool operator ==(const GrGLIRect& glRect) const {
      90           0 :         return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
      91             :     }
      92             : 
      93           0 :     bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
      94             : };
      95             : 
      96             : #endif