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 pushToGLViewportGrGLIRect26 void pushToGLViewport(const GrGLInterface* gl) const { 27 GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight)); 28 } 29 pushToGLScissorGrGLIRect30 void pushToGLScissor(const GrGLInterface* gl) const { 31 GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight)); 32 } 33 setFromGLViewportGrGLIRect34 void setFromGLViewport(const GrGLInterface* gl) { 35 GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint)); 36 GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this); 37 } 38 39 // sometimes we have a GrIRect from the client that we 40 // want to simultaneously make relative to GL's viewport 41 // and convert from top-down to bottom-up. setRelativeToGrGLIRect42 void setRelativeTo(const GrGLIRect& glRect, 43 int leftOffset, 44 int topOffset, 45 int width, 46 int height) { 47 fLeft = glRect.fLeft + leftOffset; 48 fWidth = width; 49 fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height); 50 fHeight = height; 51 52 GrAssert(fLeft >= 0); 53 GrAssert(fWidth >= 0); 54 GrAssert(fBottom >= 0); 55 GrAssert(fHeight >= 0); 56 } 57 containsGrGLIRect58 bool contains(const GrGLIRect& glRect) const { 59 return fLeft <= glRect.fLeft && 60 fBottom <= glRect.fBottom && 61 fLeft + fWidth >= glRect.fLeft + glRect.fWidth && 62 fBottom + fHeight >= glRect.fBottom + glRect.fHeight; 63 } 64 invalidateGrGLIRect65 void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;} 66 67 bool operator ==(const GrGLIRect& glRect) const { 68 return 0 == memcmp(this, &glRect, sizeof(GrGLIRect)); 69 } 70 71 bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);} 72 }; 73 74 #endif 75