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