• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 "include/gpu/gl/GrGLInterface.h"
14 #include "src/gpu/gl/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      */
asIntsGrGLIRect29     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     }
asIntsGrGLIRect38     int* asInts() { return &fLeft; }
39 
pushToGLViewportGrGLIRect40     void pushToGLViewport(const GrGLInterface* gl) const {
41         GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight));
42     }
43 
pushToGLScissorGrGLIRect44     void pushToGLScissor(const GrGLInterface* gl) const {
45         GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
46     }
47 
setFromGLViewportGrGLIRect48     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     // The GL's viewport will always be the full size of the
57     // current render target so we just pass in the rtHeight
58     // here.
setRelativeToGrGLIRect59     void setRelativeTo(int rtHeight, const SkIRect& devRect, GrSurfaceOrigin org) {
60         this->setRelativeTo(rtHeight, devRect.x(), devRect.y(), devRect.width(), devRect.height(),
61                             org);
62     }
63 
setRelativeToGrGLIRect64     void setRelativeTo(int fullHeight,
65                        int leftOffset,
66                        int topOffset,
67                        int width,
68                        int height,
69                        GrSurfaceOrigin origin) {
70         fLeft = leftOffset;
71         fWidth = width;
72         if (kBottomLeft_GrSurfaceOrigin == origin) {
73             fBottom = fullHeight - topOffset - height;
74         } else {
75             fBottom = topOffset;
76         }
77         fHeight = height;
78 
79         SkASSERT(fWidth >= 0);
80         SkASSERT(fHeight >= 0);
81     }
82 
containsGrGLIRect83     bool contains(int width, int height) const {
84         return fLeft <= 0 &&
85                fBottom <= 0 &&
86                fLeft + fWidth >= width &&
87                fBottom + fHeight >= height;
88     }
89 
invalidateGrGLIRect90     void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
isInvalidGrGLIRect91     bool isInvalid() const { return fLeft == -1 && fWidth == -1 && fBottom == -1
92         && fHeight == -1; }
93 
94     bool operator ==(const GrGLIRect& glRect) const {
95         return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
96     }
97 
98     bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
99 };
100 
101 #endif
102