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comparison: gfx/skia/trunk/src/utils/SkMeshUtils.cpp
gfx/skia/trunk/src/utils/SkMeshUtils.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:5e26bf492065 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #include "SkMeshUtils.h" | |
| 9 #include "SkCanvas.h" | |
| 10 #include "SkPaint.h" | |
| 11 | |
| 12 SkMeshIndices::SkMeshIndices() { | |
| 13 sk_bzero(this, sizeof(*this)); | |
| 14 } | |
| 15 | |
| 16 SkMeshIndices::~SkMeshIndices() { | |
| 17 sk_free(fStorage); | |
| 18 } | |
| 19 | |
| 20 bool SkMeshIndices::init(SkPoint tex[], uint16_t indices[], | |
| 21 int texW, int texH, int rows, int cols) { | |
| 22 if (rows < 2 || cols < 2) { | |
| 23 sk_free(fStorage); | |
| 24 fStorage = NULL; | |
| 25 fTex = NULL; | |
| 26 fIndices = NULL; | |
| 27 fTexCount = fIndexCount = 0; | |
| 28 return false; | |
| 29 } | |
| 30 | |
| 31 sk_free(fStorage); | |
| 32 fStorage = NULL; | |
| 33 | |
| 34 fTexCount = rows * cols; | |
| 35 rows -= 1; | |
| 36 cols -= 1; | |
| 37 fIndexCount = rows * cols * 6; | |
| 38 | |
| 39 if (tex) { | |
| 40 fTex = tex; | |
| 41 fIndices = indices; | |
| 42 } else { | |
| 43 fStorage = sk_malloc_throw(fTexCount * sizeof(SkPoint) + | |
| 44 fIndexCount * sizeof(uint16_t)); | |
| 45 fTex = (SkPoint*)fStorage; | |
| 46 fIndices = (uint16_t*)(fTex + fTexCount); | |
| 47 } | |
| 48 | |
| 49 // compute the indices | |
| 50 { | |
| 51 uint16_t* idx = fIndices; | |
| 52 int index = 0; | |
| 53 for (int y = 0; y < cols; y++) { | |
| 54 for (int x = 0; x < rows; x++) { | |
| 55 *idx++ = index; | |
| 56 *idx++ = index + rows + 1; | |
| 57 *idx++ = index + 1; | |
| 58 | |
| 59 *idx++ = index + 1; | |
| 60 *idx++ = index + rows + 1; | |
| 61 *idx++ = index + rows + 2; | |
| 62 | |
| 63 index += 1; | |
| 64 } | |
| 65 index += 1; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 // compute texture coordinates | |
| 70 { | |
| 71 SkPoint* tex = fTex; | |
| 72 const SkScalar dx = SkIntToScalar(texW) / rows; | |
| 73 const SkScalar dy = SkIntToScalar(texH) / cols; | |
| 74 for (int y = 0; y <= cols; y++) { | |
| 75 for (int x = 0; x <= rows; x++) { | |
| 76 tex->set(x*dx, y*dy); | |
| 77 tex += 1; | |
| 78 } | |
| 79 } | |
| 80 } | |
| 81 return true; | |
| 82 } | |
| 83 | |
| 84 /////////////////////////////////////////////////////////////////////////////// | |
| 85 | |
| 86 #include "SkShader.h" | |
| 87 | |
| 88 void SkMeshUtils::Draw(SkCanvas* canvas, const SkBitmap& bitmap, | |
| 89 int rows, int cols, const SkPoint verts[], | |
| 90 const SkColor colors[], const SkPaint& paint) { | |
| 91 SkMeshIndices idx; | |
| 92 | |
| 93 if (idx.init(bitmap.width(), bitmap.height(), rows, cols)) { | |
| 94 SkPaint p(paint); | |
| 95 p.setShader(SkShader::CreateBitmapShader(bitmap, | |
| 96 SkShader::kClamp_TileMode, | |
| 97 SkShader::kClamp_TileMode))->unref(); | |
| 98 canvas->drawVertices(SkCanvas::kTriangles_VertexMode, | |
| 99 rows * cols, verts, idx.tex(), colors, NULL, | |
| 100 idx.indices(), idx.indexCount(), p); | |
| 101 } | |
| 102 } |
