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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLIRect_DEFINED
#define GrGLIRect_DEFINED
#include "gl/GrGLInterface.h"
#include "GrGLUtil.h"
/**
* Helper struct for dealing with the fact that Ganesh and GL use different
* window coordinate systems (top-down vs bottom-up)
*/
struct GrGLIRect {
GrGLint fLeft;
GrGLint fBottom;
GrGLsizei fWidth;
GrGLsizei fHeight;
/**
* cast-safe way to treat the rect as an array of (4) ints.
*/
const int* asInts() const {
return &fLeft;
GR_STATIC_ASSERT(0 == offsetof(GrGLIRect, fLeft));
GR_STATIC_ASSERT(4 == offsetof(GrGLIRect, fBottom));
GR_STATIC_ASSERT(8 == offsetof(GrGLIRect, fWidth));
GR_STATIC_ASSERT(12 == offsetof(GrGLIRect, fHeight));
GR_STATIC_ASSERT(16 == sizeof(GrGLIRect)); // For an array of GrGLIRect.
}
int* asInts() { return &fLeft; }
void pushToGLViewport(const GrGLInterface* gl) const {
GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight));
}
void pushToGLScissor(const GrGLInterface* gl) const {
GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
}
void setFromGLViewport(const GrGLInterface* gl) {
GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this);
}
// sometimes we have a SkIRect from the client that we
// want to simultaneously make relative to GL's viewport
// and (optionally) convert from top-down to bottom-up.
void setRelativeTo(const GrGLIRect& glViewport, const SkIRect& devRect, GrSurfaceOrigin org) {
this->setRelativeTo(glViewport, devRect.x(), devRect.y(), devRect.width(), devRect.height(),
org);
}
void setRelativeTo(const GrGLIRect& glRect,
int leftOffset,
int topOffset,
int width,
int height,
GrSurfaceOrigin origin) {
fLeft = glRect.fLeft + leftOffset;
fWidth = width;
if (kBottomLeft_GrSurfaceOrigin == origin) {
fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height);
} else {
fBottom = glRect.fBottom + topOffset;
}
fHeight = height;
SkASSERT(fWidth >= 0);
SkASSERT(fHeight >= 0);
}
bool contains(const GrGLIRect& glRect) const {
return fLeft <= glRect.fLeft &&
fBottom <= glRect.fBottom &&
fLeft + fWidth >= glRect.fLeft + glRect.fWidth &&
fBottom + fHeight >= glRect.fBottom + glRect.fHeight;
}
void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
bool operator ==(const GrGLIRect& glRect) const {
return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
}
bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
};
#endif
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