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