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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "app/gfx/chrome_canvas.h" | |
| 6 | |
| 7 #include <limits> | |
| 8 | |
| 9 #include "app/gfx/chrome_font.h" | |
| 10 #include "app/l10n_util.h" | |
| 11 #include "base/gfx/rect.h" | |
| 12 #include "base/logging.h" | |
| 13 #include "third_party/skia/include/core/SkShader.h" | |
| 14 | |
| 15 bool ChromeCanvas::GetClipRect(gfx::Rect* r) { | |
| 16 SkRect clip; | |
| 17 if (!getClipBounds(&clip)) { | |
| 18 if (r) | |
| 19 r->SetRect(0, 0, 0, 0); | |
| 20 return false; | |
| 21 } | |
| 22 r->SetRect(SkScalarRound(clip.fLeft), SkScalarRound(clip.fTop), | |
| 23 SkScalarRound(clip.fRight - clip.fLeft), | |
| 24 SkScalarRound(clip.fBottom - clip.fTop)); | |
| 25 return true; | |
| 26 } | |
| 27 | |
| 28 bool ChromeCanvas::ClipRectInt(int x, int y, int w, int h) { | |
| 29 SkRect new_clip; | |
| 30 new_clip.set(SkIntToScalar(x), SkIntToScalar(y), | |
| 31 SkIntToScalar(x + w), SkIntToScalar(y + h)); | |
| 32 return clipRect(new_clip); | |
| 33 } | |
| 34 | |
| 35 bool ChromeCanvas::IntersectsClipRectInt(int x, int y, int w, int h) { | |
| 36 SkRect clip; | |
| 37 return getClipBounds(&clip) && | |
| 38 clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w), | |
| 39 SkIntToScalar(y + h)); | |
| 40 } | |
| 41 | |
| 42 void ChromeCanvas::TranslateInt(int x, int y) { | |
| 43 translate(SkIntToScalar(x), SkIntToScalar(y)); | |
| 44 } | |
| 45 | |
| 46 void ChromeCanvas::ScaleInt(int x, int y) { | |
| 47 scale(SkIntToScalar(x), SkIntToScalar(y)); | |
| 48 } | |
| 49 | |
| 50 void ChromeCanvas::FillRectInt(const SkColor& color, | |
| 51 int x, int y, int w, int h) { | |
| 52 SkPaint paint; | |
| 53 paint.setColor(color); | |
| 54 paint.setStyle(SkPaint::kFill_Style); | |
| 55 paint.setPorterDuffXfermode(SkPorterDuff::kSrcOver_Mode); | |
| 56 FillRectInt(x, y, w, h, paint); | |
| 57 } | |
| 58 | |
| 59 void ChromeCanvas::FillRectInt(int x, int y, int w, int h, | |
| 60 const SkPaint& paint) { | |
| 61 SkIRect rc = {x, y, x + w, y + h}; | |
| 62 drawIRect(rc, paint); | |
| 63 } | |
| 64 | |
| 65 void ChromeCanvas::DrawRectInt(const SkColor& color, | |
| 66 int x, int y, int w, int h) { | |
| 67 DrawRectInt(color, x, y, w, h, SkPorterDuff::kSrcOver_Mode); | |
| 68 } | |
| 69 | |
| 70 void ChromeCanvas::DrawRectInt(const SkColor& color, | |
| 71 int x, int y, int w, int h, | |
| 72 SkPorterDuff::Mode mode) { | |
| 73 SkPaint paint; | |
| 74 paint.setColor(color); | |
| 75 paint.setStyle(SkPaint::kStroke_Style); | |
| 76 // Set a stroke width of 0, which will put us down the stroke rect path. If | |
| 77 // we set a stroke width of 1, for example, this will internally create a | |
| 78 // path and fill it, which causes problems near the edge of the canvas. | |
| 79 paint.setStrokeWidth(SkIntToScalar(0)); | |
| 80 paint.setPorterDuffXfermode(mode); | |
| 81 | |
| 82 SkIRect rc = {x, y, x + w, y + h}; | |
| 83 drawIRect(rc, paint); | |
| 84 } | |
| 85 | |
| 86 void ChromeCanvas::DrawLineInt(const SkColor& color, | |
| 87 int x1, int y1, int x2, int y2) { | |
| 88 SkPaint paint; | |
| 89 paint.setColor(color); | |
| 90 paint.setStrokeWidth(SkIntToScalar(1)); | |
| 91 drawLine(SkIntToScalar(x1), SkIntToScalar(y1), SkIntToScalar(x2), | |
| 92 SkIntToScalar(y2), paint); | |
| 93 } | |
| 94 | |
| 95 void ChromeCanvas::DrawFocusRect(int x, int y, int width, int height) { | |
| 96 // Create a 2D bitmap containing alternating on/off pixels - we do this | |
| 97 // so that you never get two pixels of the same color around the edges | |
| 98 // of the focus rect (this may mean that opposing edges of the rect may | |
| 99 // have a dot pattern out of phase to each other). | |
| 100 static SkBitmap* dots = NULL; | |
| 101 if (!dots) { | |
| 102 int col_pixels = 32; | |
| 103 int row_pixels = 32; | |
| 104 | |
| 105 dots = new SkBitmap; | |
| 106 dots->setConfig(SkBitmap::kARGB_8888_Config, col_pixels, row_pixels); | |
| 107 dots->allocPixels(); | |
| 108 dots->eraseARGB(0, 0, 0, 0); | |
| 109 | |
| 110 uint32_t* dot = dots->getAddr32(0, 0); | |
| 111 for (int i = 0; i < row_pixels; i++) { | |
| 112 for (int u = 0; u < col_pixels; u++) { | |
| 113 if ((u % 2 + i % 2) % 2 != 0) { | |
| 114 dot[i * row_pixels + u] = SK_ColorGRAY; | |
| 115 } | |
| 116 } | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 // First the horizontal lines. | |
| 121 | |
| 122 // Make a shader for the bitmap with an origin of the box we'll draw. This | |
| 123 // shader is refcounted and will have an initial refcount of 1. | |
| 124 SkShader* shader = SkShader::CreateBitmapShader( | |
| 125 *dots, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode); | |
| 126 // Assign the shader to the paint & release our reference. The paint will | |
| 127 // now own the shader and the shader will be destroyed when the paint goes | |
| 128 // out of scope. | |
| 129 SkPaint paint; | |
| 130 paint.setShader(shader); | |
| 131 shader->unref(); | |
| 132 | |
| 133 SkRect rect; | |
| 134 rect.set(SkIntToScalar(x), SkIntToScalar(y), | |
| 135 SkIntToScalar(x + width), SkIntToScalar(y + 1)); | |
| 136 drawRect(rect, paint); | |
| 137 rect.set(SkIntToScalar(x), SkIntToScalar(y + height - 1), | |
| 138 SkIntToScalar(x + width), SkIntToScalar(y + height)); | |
| 139 drawRect(rect, paint); | |
| 140 | |
| 141 rect.set(SkIntToScalar(x), SkIntToScalar(y), | |
| 142 SkIntToScalar(x + 1), SkIntToScalar(y + height)); | |
| 143 drawRect(rect, paint); | |
| 144 rect.set(SkIntToScalar(x + width - 1), SkIntToScalar(y), | |
| 145 SkIntToScalar(x + width), SkIntToScalar(y + height)); | |
| 146 drawRect(rect, paint); | |
| 147 } | |
| 148 | |
| 149 void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int x, int y) { | |
| 150 drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y)); | |
| 151 } | |
| 152 | |
| 153 void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int x, int y, | |
| 154 const SkPaint& paint) { | |
| 155 drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y), &paint); | |
| 156 } | |
| 157 | |
| 158 void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int src_x, int src_y, | |
| 159 int src_w, int src_h, int dest_x, int dest_y, | |
| 160 int dest_w, int dest_h, | |
| 161 bool filter) { | |
| 162 SkPaint p; | |
| 163 DrawBitmapInt(bitmap, src_x, src_y, src_w, src_h, dest_x, dest_y, | |
| 164 dest_w, dest_h, filter, p); | |
| 165 } | |
| 166 | |
| 167 void ChromeCanvas::DrawBitmapInt(const SkBitmap& bitmap, int src_x, int src_y, | |
| 168 int src_w, int src_h, int dest_x, int dest_y, | |
| 169 int dest_w, int dest_h, | |
| 170 bool filter, const SkPaint& paint) { | |
| 171 DLOG_ASSERT(src_x + src_w < std::numeric_limits<int16_t>::max() && | |
| 172 src_y + src_h < std::numeric_limits<int16_t>::max()); | |
| 173 if (src_w <= 0 || src_h <= 0 || dest_w <= 0 || dest_h <= 0) { | |
| 174 NOTREACHED() << "Attempting to draw bitmap to/from an empty rect!"; | |
| 175 return; | |
| 176 } | |
| 177 | |
| 178 if (!IntersectsClipRectInt(dest_x, dest_y, dest_w, dest_h)) | |
| 179 return; | |
| 180 | |
| 181 SkRect dest_rect = { SkIntToScalar(dest_x), | |
| 182 SkIntToScalar(dest_y), | |
| 183 SkIntToScalar(dest_x + dest_w), | |
| 184 SkIntToScalar(dest_y + dest_h) }; | |
| 185 | |
| 186 if (src_w == dest_w && src_h == dest_h) { | |
| 187 // Workaround for apparent bug in Skia that causes image to occasionally | |
| 188 // shift. | |
| 189 SkIRect src_rect = { src_x, src_y, src_x + src_w, src_y + src_h }; | |
| 190 drawBitmapRect(bitmap, &src_rect, dest_rect, &paint); | |
| 191 return; | |
| 192 } | |
| 193 | |
| 194 // Make a bitmap shader that contains the bitmap we want to draw. This is | |
| 195 // basically what SkCanvas.drawBitmap does internally, but it gives us | |
| 196 // more control over quality and will use the mipmap in the source image if | |
| 197 // it has one, whereas drawBitmap won't. | |
| 198 SkShader* shader = SkShader::CreateBitmapShader(bitmap, | |
| 199 SkShader::kRepeat_TileMode, | |
| 200 SkShader::kRepeat_TileMode); | |
| 201 SkMatrix shader_scale; | |
| 202 shader_scale.setScale(SkFloatToScalar(static_cast<float>(dest_w) / src_w), | |
| 203 SkFloatToScalar(static_cast<float>(dest_h) / src_h)); | |
| 204 shader_scale.preTranslate(SkIntToScalar(-src_x), SkIntToScalar(-src_y)); | |
| 205 shader_scale.postTranslate(SkIntToScalar(dest_x), SkIntToScalar(dest_y)); | |
| 206 shader->setLocalMatrix(shader_scale); | |
| 207 | |
| 208 // Set up our paint to use the shader & release our reference (now just owned | |
| 209 // by the paint). | |
| 210 SkPaint p(paint); | |
| 211 p.setFilterBitmap(filter); | |
| 212 p.setShader(shader); | |
| 213 shader->unref(); | |
| 214 | |
| 215 // The rect will be filled by the bitmap. | |
| 216 drawRect(dest_rect, p); | |
| 217 } | |
| 218 | |
| 219 void ChromeCanvas::DrawStringInt(const std::wstring& text, | |
| 220 const gfx::Font& font, | |
| 221 const SkColor& color, | |
| 222 int x, int y, | |
| 223 int w, int h) { | |
| 224 DrawStringInt(text, font, color, x, y, w, h, | |
| 225 l10n_util::DefaultCanvasTextAlignment()); | |
| 226 } | |
| 227 | |
| 228 void ChromeCanvas::TileImageInt(const SkBitmap& bitmap, | |
| 229 int x, int y, int w, int h) { | |
| 230 TileImageInt(bitmap, 0, 0, x, y, w, h); | |
| 231 } | |
| 232 | |
| 233 void ChromeCanvas::TileImageInt(const SkBitmap& bitmap, int src_x, int src_y, | |
| 234 int dest_x, int dest_y, int w, int h) { | |
| 235 if (!IntersectsClipRectInt(dest_x, dest_y, w, h)) | |
| 236 return; | |
| 237 | |
| 238 SkPaint paint; | |
| 239 | |
| 240 SkShader* shader = SkShader::CreateBitmapShader(bitmap, | |
| 241 SkShader::kRepeat_TileMode, | |
| 242 SkShader::kRepeat_TileMode); | |
| 243 paint.setShader(shader); | |
| 244 paint.setPorterDuffXfermode(SkPorterDuff::kSrcOver_Mode); | |
| 245 | |
| 246 // CreateBitmapShader returns a Shader with a reference count of one, we | |
| 247 // need to unref after paint takes ownership of the shader. | |
| 248 shader->unref(); | |
| 249 save(); | |
| 250 translate(SkIntToScalar(dest_x - src_x), SkIntToScalar(dest_y - src_y)); | |
| 251 ClipRectInt(src_x, src_y, w, h); | |
| 252 drawPaint(paint); | |
| 253 restore(); | |
| 254 } | |
| 255 | |
| 256 SkBitmap ChromeCanvas::ExtractBitmap() { | |
| 257 const SkBitmap& device_bitmap = getDevice()->accessBitmap(false); | |
| 258 | |
| 259 // Make a bitmap to return, and a canvas to draw into it. We don't just want | |
| 260 // to call extractSubset or the copy constuctor, since we want an actual copy | |
| 261 // of the bitmap. | |
| 262 SkBitmap result; | |
| 263 device_bitmap.copyTo(&result, SkBitmap::kARGB_8888_Config); | |
| 264 return result; | |
| 265 } | |
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