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 SkIRect from the client that we 40 // want to simultaneously make relative to GL's viewport 41 // and (optionally) 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 GrSurfaceOrigin origin) { 48 fLeft = glRect.fLeft + leftOffset; 49 fWidth = width; 50 if (kBottomLeft_GrSurfaceOrigin == origin) { 51 fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height); 52 } else { 53 fBottom = glRect.fBottom + topOffset; 54 } 55 fHeight = height; 56 57 SkASSERT(fLeft >= 0); 58 SkASSERT(fWidth >= 0); 59 SkASSERT(fBottom >= 0); 60 SkASSERT(fHeight >= 0); 61 } 62 containsGrGLIRect63 bool contains(const GrGLIRect& glRect) const { 64 return fLeft <= glRect.fLeft && 65 fBottom <= glRect.fBottom && 66 fLeft + fWidth >= glRect.fLeft + glRect.fWidth && 67 fBottom + fHeight >= glRect.fBottom + glRect.fHeight; 68 } 69 invalidateGrGLIRect70 void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;} 71 72 bool operator ==(const GrGLIRect& glRect) const { 73 return 0 == memcmp(this, &glRect, sizeof(GrGLIRect)); 74 } 75 76 bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);} 77 }; 78 79 #endif 80