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comparison: gfx/thebes/gfxFontMissingGlyphs.cpp
gfx/thebes/gfxFontMissingGlyphs.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:5f9fee10a65b |
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "gfxFontMissingGlyphs.h" | |
| 7 #include "nsDeviceContext.h" | |
| 8 #include "gfxContext.h" | |
| 9 #include "gfxColor.h" | |
| 10 | |
| 11 #define CHAR_BITS(b00, b01, b02, b10, b11, b12, b20, b21, b22, b30, b31, b32, b40, b41, b42) \ | |
| 12 ((b00 << 0) | (b01 << 1) | (b02 << 2) | (b10 << 3) | (b11 << 4) | (b12 << 5) | \ | |
| 13 (b20 << 6) | (b21 << 7) | (b22 << 8) | (b30 << 9) | (b31 << 10) | (b32 << 11) | \ | |
| 14 (b40 << 12) | (b41 << 13) | (b42 << 14)) | |
| 15 | |
| 16 static const uint16_t glyphMicroFont[16] = { | |
| 17 CHAR_BITS(0, 1, 0, | |
| 18 1, 0, 1, | |
| 19 1, 0, 1, | |
| 20 1, 0, 1, | |
| 21 0, 1, 0), | |
| 22 CHAR_BITS(0, 1, 0, | |
| 23 0, 1, 0, | |
| 24 0, 1, 0, | |
| 25 0, 1, 0, | |
| 26 0, 1, 0), | |
| 27 CHAR_BITS(1, 1, 1, | |
| 28 0, 0, 1, | |
| 29 1, 1, 1, | |
| 30 1, 0, 0, | |
| 31 1, 1, 1), | |
| 32 CHAR_BITS(1, 1, 1, | |
| 33 0, 0, 1, | |
| 34 1, 1, 1, | |
| 35 0, 0, 1, | |
| 36 1, 1, 1), | |
| 37 CHAR_BITS(1, 0, 1, | |
| 38 1, 0, 1, | |
| 39 1, 1, 1, | |
| 40 0, 0, 1, | |
| 41 0, 0, 1), | |
| 42 CHAR_BITS(1, 1, 1, | |
| 43 1, 0, 0, | |
| 44 1, 1, 1, | |
| 45 0, 0, 1, | |
| 46 1, 1, 1), | |
| 47 CHAR_BITS(1, 1, 1, | |
| 48 1, 0, 0, | |
| 49 1, 1, 1, | |
| 50 1, 0, 1, | |
| 51 1, 1, 1), | |
| 52 CHAR_BITS(1, 1, 1, | |
| 53 0, 0, 1, | |
| 54 0, 0, 1, | |
| 55 0, 0, 1, | |
| 56 0, 0, 1), | |
| 57 CHAR_BITS(0, 1, 0, | |
| 58 1, 0, 1, | |
| 59 0, 1, 0, | |
| 60 1, 0, 1, | |
| 61 0, 1, 0), | |
| 62 CHAR_BITS(1, 1, 1, | |
| 63 1, 0, 1, | |
| 64 1, 1, 1, | |
| 65 0, 0, 1, | |
| 66 0, 0, 1), | |
| 67 CHAR_BITS(1, 1, 1, | |
| 68 1, 0, 1, | |
| 69 1, 1, 1, | |
| 70 1, 0, 1, | |
| 71 1, 0, 1), | |
| 72 CHAR_BITS(1, 1, 0, | |
| 73 1, 0, 1, | |
| 74 1, 1, 0, | |
| 75 1, 0, 1, | |
| 76 1, 1, 0), | |
| 77 CHAR_BITS(0, 1, 1, | |
| 78 1, 0, 0, | |
| 79 1, 0, 0, | |
| 80 1, 0, 0, | |
| 81 0, 1, 1), | |
| 82 CHAR_BITS(1, 1, 0, | |
| 83 1, 0, 1, | |
| 84 1, 0, 1, | |
| 85 1, 0, 1, | |
| 86 1, 1, 0), | |
| 87 CHAR_BITS(1, 1, 1, | |
| 88 1, 0, 0, | |
| 89 1, 1, 1, | |
| 90 1, 0, 0, | |
| 91 1, 1, 1), | |
| 92 CHAR_BITS(1, 1, 1, | |
| 93 1, 0, 0, | |
| 94 1, 1, 1, | |
| 95 1, 0, 0, | |
| 96 1, 0, 0) | |
| 97 }; | |
| 98 | |
| 99 /* Parameters that control the rendering of hexboxes. They look like this: | |
| 100 | |
| 101 BMP codepoints non-BMP codepoints | |
| 102 (U+0000 - U+FFFF) (U+10000 - U+10FFFF) | |
| 103 | |
| 104 +---------+ +-------------+ | |
| 105 | | | | | |
| 106 | HHH HHH | | HHH HHH HHH | | |
| 107 | HHH HHH | | HHH HHH HHH | | |
| 108 | HHH HHH | | HHH HHH HHH | | |
| 109 | HHH HHH | | HHH HHH HHH | | |
| 110 | HHH HHH | | HHH HHH HHH | | |
| 111 | | | | | |
| 112 | HHH HHH | | HHH HHH HHH | | |
| 113 | HHH HHH | | HHH HHH HHH | | |
| 114 | HHH HHH | | HHH HHH HHH | | |
| 115 | HHH HHH | | HHH HHH HHH | | |
| 116 | HHH HHH | | HHH HHH HHH | | |
| 117 | | | | | |
| 118 +---------+ +-------------+ | |
| 119 */ | |
| 120 | |
| 121 /** Width of a minifont glyph (see above) */ | |
| 122 static const int MINIFONT_WIDTH = 3; | |
| 123 /** Height of a minifont glyph (see above) */ | |
| 124 static const int MINIFONT_HEIGHT = 5; | |
| 125 /** | |
| 126 * Gap between minifont glyphs (both horizontal and vertical) and also | |
| 127 * the minimum desired gap between the box border and the glyphs | |
| 128 */ | |
| 129 static const int HEX_CHAR_GAP = 1; | |
| 130 /** | |
| 131 * The amount of space between the vertical edge of the glyphbox and the | |
| 132 * box border. We make this nonzero so that when multiple missing glyphs | |
| 133 * occur consecutively there's a gap between their rendered boxes. | |
| 134 */ | |
| 135 static const int BOX_HORIZONTAL_INSET = 1; | |
| 136 /** The width of the border */ | |
| 137 static const int BOX_BORDER_WIDTH = 1; | |
| 138 /** | |
| 139 * The scaling factor for the border opacity; this is multiplied by the current | |
| 140 * opacity being used to draw the text. | |
| 141 */ | |
| 142 static const gfxFloat BOX_BORDER_OPACITY = 0.5; | |
| 143 /** | |
| 144 * Draw a single hex character using the current color. A nice way to do this | |
| 145 * would be to fill in an A8 image surface and then use it as a mask | |
| 146 * to paint the current color. Tragically this doesn't currently work with the | |
| 147 * Quartz cairo backend which doesn't generally support masking with surfaces. | |
| 148 * So for now we just paint a bunch of rectangles... | |
| 149 */ | |
| 150 #ifndef MOZ_GFX_OPTIMIZE_MOBILE | |
| 151 static void | |
| 152 DrawHexChar(gfxContext *aContext, const gfxPoint& aPt, uint32_t aDigit) | |
| 153 { | |
| 154 aContext->NewPath(); | |
| 155 uint32_t glyphBits = glyphMicroFont[aDigit]; | |
| 156 int x, y; | |
| 157 for (y = 0; y < MINIFONT_HEIGHT; ++y) { | |
| 158 for (x = 0; x < MINIFONT_WIDTH; ++x) { | |
| 159 if (glyphBits & 1) { | |
| 160 aContext->Rectangle(gfxRect(x, y, 1, 1) + aPt, true); | |
| 161 } | |
| 162 glyphBits >>= 1; | |
| 163 } | |
| 164 } | |
| 165 aContext->Fill(); | |
| 166 } | |
| 167 #endif // MOZ_GFX_OPTIMIZE_MOBILE | |
| 168 | |
| 169 void | |
| 170 gfxFontMissingGlyphs::DrawMissingGlyph(gfxContext *aContext, | |
| 171 const gfxRect& aRect, | |
| 172 uint32_t aChar, | |
| 173 uint32_t aAppUnitsPerDevPixel) | |
| 174 { | |
| 175 aContext->Save(); | |
| 176 | |
| 177 gfxRGBA currentColor; | |
| 178 if (!aContext->GetDeviceColor(currentColor)) { | |
| 179 // We're currently drawing with some kind of pattern... Just draw | |
| 180 // the missing-glyph data in black. | |
| 181 currentColor = gfxRGBA(0,0,0,1); | |
| 182 } | |
| 183 | |
| 184 // Stroke a rectangle so that the stroke's left edge is inset one pixel | |
| 185 // from the left edge of the glyph box and the stroke's right edge | |
| 186 // is inset one pixel from the right edge of the glyph box. | |
| 187 gfxFloat halfBorderWidth = BOX_BORDER_WIDTH / 2.0; | |
| 188 gfxFloat borderLeft = aRect.X() + BOX_HORIZONTAL_INSET + halfBorderWidth; | |
| 189 gfxFloat borderRight = aRect.XMost() - BOX_HORIZONTAL_INSET - halfBorderWidth; | |
| 190 gfxRect borderStrokeRect(borderLeft, aRect.Y() + halfBorderWidth, | |
| 191 borderRight - borderLeft, | |
| 192 aRect.Height() - 2.0 * halfBorderWidth); | |
| 193 if (!borderStrokeRect.IsEmpty()) { | |
| 194 aContext->SetLineWidth(BOX_BORDER_WIDTH); | |
| 195 aContext->SetDash(gfxContext::gfxLineSolid); | |
| 196 aContext->SetLineCap(gfxContext::LINE_CAP_SQUARE); | |
| 197 aContext->SetLineJoin(gfxContext::LINE_JOIN_MITER); | |
| 198 gfxRGBA color = currentColor; | |
| 199 color.a *= BOX_BORDER_OPACITY; | |
| 200 aContext->SetDeviceColor(color); | |
| 201 aContext->NewPath(); | |
| 202 aContext->Rectangle(borderStrokeRect); | |
| 203 | |
| 204 #ifdef MOZ_GFX_OPTIMIZE_MOBILE | |
| 205 aContext->Fill(); | |
| 206 #else | |
| 207 aContext->Stroke(); | |
| 208 #endif | |
| 209 } | |
| 210 | |
| 211 #ifndef MOZ_GFX_OPTIMIZE_MOBILE | |
| 212 gfxPoint center(aRect.X() + aRect.Width() / 2, | |
| 213 aRect.Y() + aRect.Height() / 2); | |
| 214 gfxFloat halfGap = HEX_CHAR_GAP / 2.0; | |
| 215 gfxFloat top = -(MINIFONT_HEIGHT + halfGap); | |
| 216 aContext->SetDeviceColor(currentColor); | |
| 217 aContext->Translate(center); | |
| 218 // We always want integer scaling, otherwise the "bitmap" glyphs will look | |
| 219 // even uglier than usual when zoomed | |
| 220 int32_t scale = | |
| 221 std::max<int32_t>(1, nsDeviceContext::AppUnitsPerCSSPixel() / | |
| 222 aAppUnitsPerDevPixel); | |
| 223 aContext->Scale(gfxFloat(scale), gfxFloat(scale)); | |
| 224 if (aChar < 0x10000) { | |
| 225 if (aRect.Width() >= 2 * (MINIFONT_WIDTH + HEX_CHAR_GAP) && | |
| 226 aRect.Height() >= 2 * MINIFONT_HEIGHT + HEX_CHAR_GAP) { | |
| 227 // Draw 4 digits for BMP | |
| 228 gfxFloat left = -(MINIFONT_WIDTH + halfGap); | |
| 229 DrawHexChar(aContext, | |
| 230 gfxPoint(left, top), (aChar >> 12) & 0xF); | |
| 231 DrawHexChar(aContext, | |
| 232 gfxPoint(halfGap, top), (aChar >> 8) & 0xF); | |
| 233 DrawHexChar(aContext, | |
| 234 gfxPoint(left, halfGap), (aChar >> 4) & 0xF); | |
| 235 DrawHexChar(aContext, | |
| 236 gfxPoint(halfGap, halfGap), aChar & 0xF); | |
| 237 } | |
| 238 } else { | |
| 239 if (aRect.Width() >= 3 * (MINIFONT_WIDTH + HEX_CHAR_GAP) && | |
| 240 aRect.Height() >= 2 * MINIFONT_HEIGHT + HEX_CHAR_GAP) { | |
| 241 // Draw 6 digits for non-BMP | |
| 242 gfxFloat first = -(MINIFONT_WIDTH * 1.5 + HEX_CHAR_GAP); | |
| 243 gfxFloat second = -(MINIFONT_WIDTH / 2.0); | |
| 244 gfxFloat third = (MINIFONT_WIDTH / 2.0 + HEX_CHAR_GAP); | |
| 245 DrawHexChar(aContext, | |
| 246 gfxPoint(first, top), (aChar >> 20) & 0xF); | |
| 247 DrawHexChar(aContext, | |
| 248 gfxPoint(second, top), (aChar >> 16) & 0xF); | |
| 249 DrawHexChar(aContext, | |
| 250 gfxPoint(third, top), (aChar >> 12) & 0xF); | |
| 251 DrawHexChar(aContext, | |
| 252 gfxPoint(first, halfGap), (aChar >> 8) & 0xF); | |
| 253 DrawHexChar(aContext, | |
| 254 gfxPoint(second, halfGap), (aChar >> 4) & 0xF); | |
| 255 DrawHexChar(aContext, | |
| 256 gfxPoint(third, halfGap), aChar & 0xF); | |
| 257 } | |
| 258 } | |
| 259 #endif | |
| 260 | |
| 261 aContext->Restore(); | |
| 262 } | |
| 263 | |
| 264 gfxFloat | |
| 265 gfxFontMissingGlyphs::GetDesiredMinWidth(uint32_t aChar, | |
| 266 uint32_t aAppUnitsPerDevPixel) | |
| 267 { | |
| 268 /** | |
| 269 * The minimum desired width for a missing-glyph glyph box. I've laid it out | |
| 270 * like this so you can see what goes where. | |
| 271 */ | |
| 272 gfxFloat width = BOX_HORIZONTAL_INSET + BOX_BORDER_WIDTH + HEX_CHAR_GAP + | |
| 273 MINIFONT_WIDTH + HEX_CHAR_GAP + MINIFONT_WIDTH + | |
| 274 ((aChar < 0x10000) ? 0 : HEX_CHAR_GAP + MINIFONT_WIDTH) + | |
| 275 HEX_CHAR_GAP + BOX_BORDER_WIDTH + BOX_HORIZONTAL_INSET; | |
| 276 // Note that this will give us floating-point division, so the width will | |
| 277 // -not- be snapped to integer multiples of its basic pixel value | |
| 278 width *= gfxFloat(nsDeviceContext::AppUnitsPerCSSPixel()) / aAppUnitsPerDevPixel; | |
| 279 return width; | |
| 280 } |
