bsalomon@google.com | 8895a7a | 2011-02-18 16:09:55 +0000 | [diff] [blame^] | 1 | #include "GrGLConfig.h" |
| 2 | |
| 3 | #ifndef GrGLIRect_DEFINED |
| 4 | #define GrGLIRect_DEFINED |
| 5 | |
| 6 | /** |
| 7 | * Helper struct for dealing with the fact that Ganesh and GL use different |
| 8 | * window coordinate systems (top-down vs bottom-up) |
| 9 | */ |
| 10 | struct GrGLIRect { |
| 11 | GLint fLeft; |
| 12 | GLint fBottom; |
| 13 | GLsizei fWidth; |
| 14 | GLsizei fHeight; |
| 15 | |
| 16 | void pushToGLViewport() const { |
| 17 | GR_GL(Viewport(fLeft, fBottom, fWidth, fHeight)); |
| 18 | } |
| 19 | |
| 20 | void pushToGLScissor() const { |
| 21 | GR_GL(Scissor(fLeft, fBottom, fWidth, fHeight)); |
| 22 | } |
| 23 | |
| 24 | void setFromGLViewport() { |
| 25 | GR_STATIC_ASSERT(sizeof(*this) == 4*sizeof(GLint)); |
| 26 | GR_GL_GetIntegerv(GL_VIEWPORT, (GLint*) this); |
| 27 | } |
| 28 | |
| 29 | // sometimes we have a GrIRect from the client that we |
| 30 | // want to simultaneously make relative to GL's viewport |
| 31 | // and convert from top-down to bottom-up. |
| 32 | void setRelativeTo(const GrGLIRect& glRect, |
| 33 | int leftOffset, |
| 34 | int topOffset, |
| 35 | int width, |
| 36 | int height) { |
| 37 | fLeft = glRect.fLeft + leftOffset; |
| 38 | fWidth = width; |
| 39 | fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height); |
| 40 | fHeight = height; |
| 41 | |
| 42 | GrAssert(fLeft >= 0); |
| 43 | GrAssert(fWidth >= 0); |
| 44 | GrAssert(fBottom >= 0); |
| 45 | GrAssert(fHeight >= 0); |
| 46 | } |
| 47 | |
| 48 | bool contains(const GrGLIRect& glRect) const { |
| 49 | return fLeft <= glRect.fLeft && |
| 50 | fBottom <= glRect.fBottom && |
| 51 | fLeft + fWidth >= glRect.fLeft + glRect.fWidth && |
| 52 | fBottom + fHeight >= glRect.fBottom + glRect.fHeight; |
| 53 | } |
| 54 | |
| 55 | void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;} |
| 56 | |
| 57 | bool operator ==(const GrGLIRect& glRect) const { |
| 58 | return 0 == memcmp(this, &glRect, sizeof(GrGLIRect)); |
| 59 | } |
| 60 | |
| 61 | bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);} |
| 62 | }; |
| 63 | |
| 64 | #endif |