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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPatchGrid.h"
#include "SkPatchUtils.h"
SkPatchGrid::SkPatchGrid(int rows, int cols, VertexType flags)
: fRows(0)
, fCols(0)
, fModeFlags(kNone_VertexType)
, fCornerPts(nullptr)
, fCornerColors(nullptr)
, fTexCoords(nullptr)
, fHrzCtrlPts(nullptr)
, fVrtCtrlPts(nullptr)
{
this->reset(rows, cols, flags, SkBlendMode::kModulate);
}
SkPatchGrid::~SkPatchGrid() {
delete[] fCornerPts;
delete[] fCornerColors;
delete[] fTexCoords;
delete[] fHrzCtrlPts;
delete[] fVrtCtrlPts;
}
bool SkPatchGrid::setPatch(int x, int y, const SkPoint cubics[12], const SkColor colors[4],
const SkPoint texCoords[4]) {
// Check for the passed paramaters to be within the range of the grid dimensions and a valid
// pointer for the cubics' control points.
if (x < 0 || y < 0 || x > fCols - 1 || y > fRows - 1 || nullptr == cubics) {
return false;
}
// setup corners and colors
int cornerPos = y * (fCols + 1) + x;
fCornerPts[cornerPos] = cubics[SkPatchUtils::kTopP0_CubicCtrlPts];
fCornerPts[cornerPos + 1] = cubics[SkPatchUtils::kTopP3_CubicCtrlPts];
fCornerPts[cornerPos + (fCols + 1)] = cubics[SkPatchUtils::kBottomP0_CubicCtrlPts];
fCornerPts[cornerPos + (fCols + 1) + 1] = cubics[SkPatchUtils::kBottomP3_CubicCtrlPts];
// set horizontal control points
int hrzPos = y * (fCols * 2) + (x * 2);
fHrzCtrlPts[hrzPos] = cubics[SkPatchUtils::kTopP1_CubicCtrlPts];
fHrzCtrlPts[hrzPos + 1] = cubics[SkPatchUtils::kTopP2_CubicCtrlPts];
fHrzCtrlPts[hrzPos + (fCols * 2)] = cubics[SkPatchUtils::kBottomP1_CubicCtrlPts];
fHrzCtrlPts[hrzPos + (fCols * 2) + 1] = cubics[SkPatchUtils::kBottomP2_CubicCtrlPts];
// set vertical control points
int vrtPos = (y*2) * (fCols + 1) + x;
fVrtCtrlPts[vrtPos] = cubics[SkPatchUtils::kLeftP1_CubicCtrlPts];
fVrtCtrlPts[vrtPos + 1] = cubics[SkPatchUtils::kRightP1_CubicCtrlPts];
fVrtCtrlPts[vrtPos + (fCols + 1)] = cubics[SkPatchUtils::kLeftP2_CubicCtrlPts];
fVrtCtrlPts[vrtPos + (fCols + 1) + 1] = cubics[SkPatchUtils::kRightP2_CubicCtrlPts];
// set optional values (colors and texture coordinates)
if ((fModeFlags & kColors_VertexType) && colors) {
fCornerColors[cornerPos] = colors[0];
fCornerColors[cornerPos + 1] = colors[1];
fCornerColors[cornerPos + (fCols + 1)] = colors[3];
fCornerColors[cornerPos + (fCols + 1) + 1] = colors[2];
}
if ((fModeFlags & kTexs_VertexType) && texCoords) {
fTexCoords[cornerPos] = texCoords[0];
fTexCoords[cornerPos + 1] = texCoords[1];
fTexCoords[cornerPos + (fCols + 1)] = texCoords[3];
fTexCoords[cornerPos + (fCols + 1) + 1] = texCoords[2];
}
return true;
}
bool SkPatchGrid::getPatch(int x, int y, SkPoint cubics[12], SkColor colors[4],
SkPoint texCoords[4]) const {
if (x < 0 || y < 0 || x > fCols - 1 || y > fRows - 1 || nullptr == cubics) {
return false;
}
// set the patch by building the array of points and colors with the corresponding values.
int cornerPos = y * (fCols + 1) + x;
cubics[SkPatchUtils::kTopP0_CubicCtrlPts] = fCornerPts[cornerPos];
cubics[SkPatchUtils::kTopP3_CubicCtrlPts] = fCornerPts[cornerPos + 1];
cubics[SkPatchUtils::kBottomP0_CubicCtrlPts] = fCornerPts[cornerPos + (fCols + 1)];
cubics[SkPatchUtils::kBottomP3_CubicCtrlPts] = fCornerPts[cornerPos + (fCols + 1) + 1];
int hrzPos = y * (fCols * 2) + (x * 2);
cubics[SkPatchUtils::kTopP1_CubicCtrlPts] = fHrzCtrlPts[hrzPos];
cubics[SkPatchUtils::kTopP2_CubicCtrlPts] = fHrzCtrlPts[hrzPos + 1];
cubics[SkPatchUtils::kBottomP1_CubicCtrlPts] = fHrzCtrlPts[hrzPos + (fCols * 2)];
cubics[SkPatchUtils::kBottomP2_CubicCtrlPts] = fHrzCtrlPts[hrzPos + (fCols * 2) + 1];
int vrtPos = (y*2) * (fCols + 1) + x;
cubics[SkPatchUtils::kLeftP1_CubicCtrlPts] = fVrtCtrlPts[vrtPos];
cubics[SkPatchUtils::kRightP1_CubicCtrlPts] = fVrtCtrlPts[vrtPos + 1];
cubics[SkPatchUtils::kLeftP2_CubicCtrlPts] = fVrtCtrlPts[vrtPos + (fCols + 1)];
cubics[SkPatchUtils::kRightP2_CubicCtrlPts] = fVrtCtrlPts[vrtPos + (fCols + 1) + 1];
if ((fModeFlags & kColors_VertexType) && colors) {
colors[0] = fCornerColors[cornerPos];
colors[1] = fCornerColors[cornerPos + 1];
colors[3] = fCornerColors[cornerPos + (fCols + 1)];
colors[2] = fCornerColors[cornerPos + (fCols + 1) + 1];
}
if ((fModeFlags & kTexs_VertexType) && texCoords) {
texCoords[0] = fTexCoords[cornerPos];
texCoords[1] = fTexCoords[cornerPos + 1];
texCoords[3] = fTexCoords[cornerPos + (fCols + 1)];
texCoords[2] = fTexCoords[cornerPos + (fCols + 1) + 1];
}
return true;
}
void SkPatchGrid::reset(int rows, int cols, VertexType flags, SkBlendMode blendmode) {
delete[] fCornerPts;
delete[] fCornerColors;
delete[] fTexCoords;
delete[] fHrzCtrlPts;
delete[] fVrtCtrlPts;
fCols = cols;
fRows = rows;
fModeFlags = flags;
fBlendMode = blendmode;
fCornerPts = new SkPoint[(fRows + 1) * (fCols + 1)];
fHrzCtrlPts = new SkPoint[(fRows + 1) * fCols * 2];
fVrtCtrlPts = new SkPoint[fRows * 2 * (fCols + 1)];
memset(fCornerPts, 0, (fRows + 1) * (fCols + 1) * sizeof(SkPoint));
memset(fHrzCtrlPts, 0, (fRows + 1) * fCols * 2 * sizeof(SkPoint));
memset(fVrtCtrlPts, 0, fRows * 2 * (fCols + 1) * sizeof(SkPoint));
if (fModeFlags & kColors_VertexType) {
fCornerColors = new SkColor[(fRows + 1) * (fCols + 1)];
memset(fCornerColors, 0, (fRows + 1) * (fCols + 1) * sizeof(SkColor));
}
if (fModeFlags & kTexs_VertexType) {
fTexCoords = new SkPoint[(fRows + 1) * (fCols + 1)];
memset(fTexCoords, 0, (fRows + 1) * (fCols + 1) * sizeof(SkPoint));
}
}
void SkPatchGrid::draw(SkCanvas* canvas, SkPaint& paint) {
int* maxCols = new int[fCols];
int* maxRows = new int[fRows];
memset(maxCols, 0, fCols * sizeof(int));
memset(maxRows, 0, fRows * sizeof(int));
// Get the maximum level of detail per axis for each row and column
for (int y = 0; y < fRows; y++) {
for (int x = 0; x < fCols; x++) {
SkPoint cubics[12];
this->getPatch(x, y, cubics, nullptr, nullptr);
SkMatrix matrix = canvas->getTotalMatrix();
SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix);
maxCols[x] = SkMax32(maxCols[x], lod.width());
maxRows[y] = SkMax32(maxRows[y], lod.height());
}
}
// Draw the patches by generating their geometry with the maximum level of detail per axis.
for (int x = 0; x < fCols; x++) {
for (int y = 0; y < fRows; y++) {
SkPoint cubics[12];
SkPoint texCoords[4];
SkColor colors[4];
this->getPatch(x, y, cubics, colors, texCoords);
SkPatchUtils::VertexData data;
if (SkPatchUtils::getVertexData(&data, cubics,
fModeFlags & kColors_VertexType ? colors : nullptr,
fModeFlags & kTexs_VertexType ? texCoords : nullptr,
maxCols[x], maxRows[y])) {
canvas->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCount,
data.fPoints, data.fTexCoords, data.fColors, fBlendMode,
data.fIndices, data.fIndexCount, paint);
}
}
}
delete[] maxCols;
delete[] maxRows;
}
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