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| 1 /* |
| 2 * Copyright 2014 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 #include "SkPatchGrid.h" |
| 9 #include "SkPatchUtils.h" |
| 10 |
| 11 SkPatchGrid::SkPatchGrid(int rows, int cols, VertexType flags, SkXfermode* xfer) |
| 12 : fRows(0) |
| 13 , fCols(0) |
| 14 , fModeFlags(kNone_VertexType) |
| 15 , fCornerPts(NULL) |
| 16 , fCornerColors(NULL) |
| 17 , fTexCoords(NULL) |
| 18 , fHrzCtrlPts(NULL) |
| 19 , fVrtCtrlPts(NULL) |
| 20 , fXferMode(NULL) { |
| 21 this->reset(rows, cols, flags, xfer); |
| 22 } |
| 23 |
| 24 SkPatchGrid::~SkPatchGrid() { |
| 25 SkDELETE_ARRAY(fCornerPts); |
| 26 SkDELETE_ARRAY(fCornerColors); |
| 27 SkDELETE_ARRAY(fTexCoords); |
| 28 SkDELETE_ARRAY(fHrzCtrlPts); |
| 29 SkDELETE_ARRAY(fVrtCtrlPts); |
| 30 } |
| 31 |
| 32 bool SkPatchGrid::setPatch(int x, int y, const SkPoint cubics[12], const SkColor
colors[4], |
| 33 const SkPoint texCoords[4]) { |
| 34 // Check for the passed paramaters to be within the range of the grid dimens
ions and a valid |
| 35 // pointer for the cubics' control points. |
| 36 if (x < 0 || y < 0 || x > fCols - 1 || y > fRows - 1 || NULL == cubics) { |
| 37 return false; |
| 38 } |
| 39 |
| 40 // setup corners and colors |
| 41 int cornerPos = y * (fCols + 1) + x; |
| 42 fCornerPts[cornerPos] = cubics[SkPatchUtils::kTopP0_CubicCtrlPts]; |
| 43 fCornerPts[cornerPos + 1] = cubics[SkPatchUtils::kTopP3_CubicCtrlPts]; |
| 44 fCornerPts[cornerPos + (fCols + 1)] = cubics[SkPatchUtils::kBottomP0_CubicCt
rlPts]; |
| 45 fCornerPts[cornerPos + (fCols + 1) + 1] = cubics[SkPatchUtils::kBottomP3_Cub
icCtrlPts]; |
| 46 |
| 47 // set horizontal control points |
| 48 int hrzPos = y * (fCols * 2) + (x * 2); |
| 49 fHrzCtrlPts[hrzPos] = cubics[SkPatchUtils::kTopP1_CubicCtrlPts]; |
| 50 fHrzCtrlPts[hrzPos + 1] = cubics[SkPatchUtils::kTopP2_CubicCtrlPts]; |
| 51 fHrzCtrlPts[hrzPos + (fCols * 2)] = cubics[SkPatchUtils::kBottomP1_CubicCtrl
Pts]; |
| 52 fHrzCtrlPts[hrzPos + (fCols * 2) + 1] = cubics[SkPatchUtils::kBottomP2_Cubic
CtrlPts]; |
| 53 |
| 54 // set vertical control points |
| 55 int vrtPos = (y*2) * (fCols + 1) + x; |
| 56 fVrtCtrlPts[vrtPos] = cubics[SkPatchUtils::kLeftP1_CubicCtrlPts]; |
| 57 fVrtCtrlPts[vrtPos + 1] = cubics[SkPatchUtils::kRightP1_CubicCtrlPts]; |
| 58 fVrtCtrlPts[vrtPos + (fCols + 1)] = cubics[SkPatchUtils::kLeftP2_CubicCtrlPt
s]; |
| 59 fVrtCtrlPts[vrtPos + (fCols + 1) + 1] = cubics[SkPatchUtils::kRightP2_CubicC
trlPts]; |
| 60 |
| 61 // set optional values (colors and texture coordinates) |
| 62 if ((fModeFlags & kColors_VertexType) && NULL != colors) { |
| 63 fCornerColors[cornerPos] = colors[0]; |
| 64 fCornerColors[cornerPos + 1] = colors[1]; |
| 65 fCornerColors[cornerPos + (fCols + 1)] = colors[3]; |
| 66 fCornerColors[cornerPos + (fCols + 1) + 1] = colors[2]; |
| 67 } |
| 68 |
| 69 if ((fModeFlags & kTexs_VertexType) && NULL != texCoords) { |
| 70 fTexCoords[cornerPos] = texCoords[0]; |
| 71 fTexCoords[cornerPos + 1] = texCoords[1]; |
| 72 fTexCoords[cornerPos + (fCols + 1)] = texCoords[3]; |
| 73 fTexCoords[cornerPos + (fCols + 1) + 1] = texCoords[2]; |
| 74 } |
| 75 |
| 76 return true; |
| 77 } |
| 78 |
| 79 bool SkPatchGrid::getPatch(int x, int y, SkPoint cubics[12], SkColor colors[4], |
| 80 SkPoint texCoords[4]) const { |
| 81 |
| 82 if (x < 0 || y < 0 || x > fCols - 1 || y > fRows - 1 || NULL == cubics) { |
| 83 return false; |
| 84 } |
| 85 |
| 86 // set the patch by building the array of points and colors with the corresp
onding values. |
| 87 int cornerPos = y * (fCols + 1) + x; |
| 88 cubics[SkPatchUtils::kTopP0_CubicCtrlPts] = fCornerPts[cornerPos]; |
| 89 cubics[SkPatchUtils::kTopP3_CubicCtrlPts] = fCornerPts[cornerPos + 1]; |
| 90 cubics[SkPatchUtils::kBottomP0_CubicCtrlPts] = fCornerPts[cornerPos + (fCols
+ 1)]; |
| 91 cubics[SkPatchUtils::kBottomP3_CubicCtrlPts] = fCornerPts[cornerPos + (fCols
+ 1) + 1]; |
| 92 |
| 93 int hrzPos = y * (fCols * 2) + (x * 2); |
| 94 cubics[SkPatchUtils::kTopP1_CubicCtrlPts] = fHrzCtrlPts[hrzPos]; |
| 95 cubics[SkPatchUtils::kTopP2_CubicCtrlPts] = fHrzCtrlPts[hrzPos + 1]; |
| 96 cubics[SkPatchUtils::kBottomP1_CubicCtrlPts] = fHrzCtrlPts[hrzPos + (fCols *
2)]; |
| 97 cubics[SkPatchUtils::kBottomP2_CubicCtrlPts] = fHrzCtrlPts[hrzPos + (fCols *
2) + 1]; |
| 98 |
| 99 int vrtPos = (y*2) * (fCols + 1) + x; |
| 100 cubics[SkPatchUtils::kLeftP1_CubicCtrlPts] = fVrtCtrlPts[vrtPos]; |
| 101 cubics[SkPatchUtils::kRightP1_CubicCtrlPts] = fVrtCtrlPts[vrtPos + 1]; |
| 102 cubics[SkPatchUtils::kLeftP2_CubicCtrlPts] = fVrtCtrlPts[vrtPos + (fCols + 1
)]; |
| 103 cubics[SkPatchUtils::kRightP2_CubicCtrlPts] = fVrtCtrlPts[vrtPos + (fCols +
1) + 1]; |
| 104 |
| 105 if ((fModeFlags & kColors_VertexType) && NULL != colors) { |
| 106 colors[0] = fCornerColors[cornerPos]; |
| 107 colors[1] = fCornerColors[cornerPos + 1]; |
| 108 colors[3] = fCornerColors[cornerPos + (fCols + 1)]; |
| 109 colors[2] = fCornerColors[cornerPos + (fCols + 1) + 1]; |
| 110 } |
| 111 |
| 112 if ((fModeFlags & kTexs_VertexType) && NULL != texCoords) { |
| 113 texCoords[0] = fTexCoords[cornerPos]; |
| 114 texCoords[1] = fTexCoords[cornerPos + 1]; |
| 115 texCoords[3] = fTexCoords[cornerPos + (fCols + 1)]; |
| 116 texCoords[2] = fTexCoords[cornerPos + (fCols + 1) + 1]; |
| 117 } |
| 118 |
| 119 return true; |
| 120 } |
| 121 |
| 122 void SkPatchGrid::reset(int rows, int cols, VertexType flags, SkXfermode* xMode)
{ |
| 123 SkDELETE_ARRAY(fCornerPts); |
| 124 SkDELETE_ARRAY(fCornerColors); |
| 125 SkDELETE_ARRAY(fTexCoords); |
| 126 SkDELETE_ARRAY(fHrzCtrlPts); |
| 127 SkDELETE_ARRAY(fVrtCtrlPts); |
| 128 |
| 129 fCols = cols; |
| 130 fRows = rows; |
| 131 fModeFlags = flags; |
| 132 fXferMode = xMode; |
| 133 |
| 134 fCornerPts = SkNEW_ARRAY(SkPoint, (fRows + 1) * (fCols + 1)); |
| 135 fHrzCtrlPts = SkNEW_ARRAY(SkPoint, (fRows + 1) * fCols * 2); |
| 136 fVrtCtrlPts = SkNEW_ARRAY(SkPoint, fRows * 2 * (fCols + 1)); |
| 137 memset(fCornerPts, 0, (fRows + 1) * (fCols + 1) * sizeof(SkPoint)); |
| 138 memset(fHrzCtrlPts, 0, (fRows + 1) * fCols * 2 * sizeof(SkPoint)); |
| 139 memset(fVrtCtrlPts, 0, fRows * 2 * (fCols + 1) * sizeof(SkPoint)); |
| 140 |
| 141 if (fModeFlags & kColors_VertexType) { |
| 142 fCornerColors = SkNEW_ARRAY(SkColor, (fRows + 1) * (fCols + 1)); |
| 143 memset(fCornerColors, 0, (fRows + 1) * (fCols + 1) * sizeof(SkColor)); |
| 144 } |
| 145 |
| 146 if (fModeFlags & kTexs_VertexType) { |
| 147 fTexCoords = SkNEW_ARRAY(SkPoint, (fRows + 1) * (fCols + 1)); |
| 148 memset(fTexCoords, 0, (fRows + 1) * (fCols + 1) * sizeof(SkPoint)); |
| 149 } |
| 150 } |
| 151 |
| 152 void SkPatchGrid::draw(SkCanvas* canvas, SkPaint& paint) { |
| 153 int* maxCols = SkNEW_ARRAY(int, fCols); |
| 154 int* maxRows = SkNEW_ARRAY(int, fRows); |
| 155 memset(maxCols, 0, fCols * sizeof(int)); |
| 156 memset(maxRows, 0, fRows * sizeof(int)); |
| 157 |
| 158 // Get the maximum level of detail per axis for each row and column |
| 159 for (int y = 0; y < fRows; y++) { |
| 160 for (int x = 0; x < fCols; x++) { |
| 161 SkPoint cubics[12]; |
| 162 this->getPatch(x, y, cubics, NULL, NULL); |
| 163 SkMatrix matrix = canvas->getTotalMatrix(); |
| 164 SkISize lod = SkPatchUtils::GetLevelOfDetail(cubics, &matrix); |
| 165 maxCols[x] = SkMax32(maxCols[x], lod.width()); |
| 166 maxRows[y] = SkMax32(maxRows[y], lod.height()); |
| 167 } |
| 168 } |
| 169 // Draw the patches by generating their geometry with the maximum level of d
etail per axis. |
| 170 for (int x = 0; x < fCols; x++) { |
| 171 for (int y = 0; y < fRows; y++) { |
| 172 SkPoint cubics[12]; |
| 173 SkPoint texCoords[4]; |
| 174 SkColor colors[4]; |
| 175 this->getPatch(x, y, cubics, colors, texCoords); |
| 176 SkPatchUtils::VertexData data; |
| 177 SkPatchUtils::getVertexData(&data, cubics, |
| 178 fModeFlags & kColors_VertexType ? colors
: NULL, |
| 179 fModeFlags & kTexs_VertexType ? texCoord
s : NULL, |
| 180 maxCols[x], maxRows[y]); |
| 181 canvas->drawVertices(SkCanvas::kTriangles_VertexMode, data.fVertexCo
unt, |
| 182 data.fPoints, data.fTexCoords, data.fColors, fX
ferMode, |
| 183 data.fIndices, data.fIndexCount, paint); |
| 184 } |
| 185 } |
| 186 SkDELETE_ARRAY(maxCols); |
| 187 SkDELETE_ARRAY(maxRows); |
| 188 } |
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