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#include "GrMesh.h"
#include "SkCanvas.h"
GrMesh::GrMesh() : fPts(NULL), fCount(0), fIndices(NULL), fIndexCount(0) {}
GrMesh::~GrMesh() {
delete[] fPts;
delete[] fIndices;
}
GrMesh& GrMesh::operator=(const GrMesh& src) {
delete[] fPts;
delete[] fIndices;
fBounds = src.fBounds;
fRows = src.fRows;
fCols = src.fCols;
fCount = src.fCount;
fPts = new SkPoint[fCount * 2];
fTex = fPts + fCount;
memcpy(fPts, src.fPts, fCount * 2 * sizeof(SkPoint));
delete[] fIndices;
fIndexCount = src.fIndexCount;
fIndices = new uint16_t[fIndexCount];
memcpy(fIndices, src.fIndices, fIndexCount * sizeof(uint16_t));
return *this;
}
void GrMesh::init(const SkRect& bounds, int rows, int cols,
const SkRect& texture) {
SkASSERT(rows > 0 && cols > 0);
fBounds = bounds;
fRows = rows;
fCols = cols;
delete[] fPts;
fCount = (rows + 1) * (cols + 1);
fPts = new SkPoint[fCount * 2];
fTex = fPts + fCount;
delete[] fIndices;
fIndexCount = rows * cols * 6;
fIndices = new uint16_t[fIndexCount];
SkPoint* pts = fPts;
const SkScalar dx = bounds.width() / rows;
const SkScalar dy = bounds.height() / cols;
SkPoint* tex = fTex;
const SkScalar dtx = texture.width() / rows;
const SkScalar dty = texture.height() / cols;
uint16_t* idx = fIndices;
int index = 0;
for (int y = 0; y <= cols; y++) {
for (int x = 0; x <= rows; x++) {
pts->set(bounds.fLeft + x*dx, bounds.fTop + y*dy);
pts += 1;
tex->set(texture.fLeft + x*dtx, texture.fTop + y*dty);
tex += 1;
if (y < cols && x < rows) {
*idx++ = index;
*idx++ = index + rows + 1;
*idx++ = index + 1;
*idx++ = index + 1;
*idx++ = index + rows + 1;
*idx++ = index + rows + 2;
index += 1;
}
}
index += 1;
}
}
void GrMesh::draw(SkCanvas* canvas, const SkPaint& paint) {
canvas->drawVertices(SkCanvas::kTriangles_VertexMode, fCount,
fPts, fTex, NULL, NULL, fIndices, fIndexCount,
paint);
}
/////////////////////////////////////////////
#include "SkBoundaryPatch.h"
#include "SkMeshUtils.h"
static SkPoint SkPointInterp(const SkPoint& a, const SkPoint& b, SkScalar t) {
return SkPoint::Make(SkScalarInterp(a.fX, b.fX, t),
SkScalarInterp(a.fY, b.fY, t));
}
static void set_cubic(SkPoint pts[4], SkScalar x0, SkScalar y0,
SkScalar x3, SkScalar y3, SkScalar scale = 1) {
SkPoint tmp, tmp2;
pts[0].set(x0, y0);
pts[3].set(x3, y3);
tmp = SkPointInterp(pts[0], pts[3], SK_Scalar1/3);
tmp2 = pts[0] - tmp;
tmp2.rotateCW();
tmp2.scale(scale);
pts[1] = tmp + tmp2;
tmp = SkPointInterp(pts[0], pts[3], 2*SK_Scalar1/3);
tmp2 = pts[3] - tmp;
tmp2.rotateCW();
tmp2.scale(scale);
pts[2] = tmp + tmp2;
}
void test_patch(SkCanvas* canvas, const SkBitmap& bm, SkScalar scale) {
const float w = bm.width();
const float h = bm.height();
SkCubicBoundary cubic;
set_cubic(cubic.fPts + 0, 0, 0, w, 0, scale);
set_cubic(cubic.fPts + 3, w, 0, w, h, scale);
set_cubic(cubic.fPts + 6, w, h, 0, h, -scale);
set_cubic(cubic.fPts + 9, 0, h, 0, 0, scale);
SkBoundaryPatch patch;
patch.setBoundary(&cubic);
const int Rows = 16;
const int Cols = 16;
SkPoint pts[Rows * Cols];
patch.evalPatch(pts, Rows, Cols);
SkPaint paint;
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
SkMeshUtils::Draw(canvas, bm, Rows, Cols, pts, NULL, paint);
}
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