LCOV - code coverage report
Current view: directory - gfx/thebes - gfxFontMissingGlyphs.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 60 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Corporation code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2007
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Robert O'Callahan <robert@ocallahan.org>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "gfxFontMissingGlyphs.h"
      39                 : 
      40                 : #define CHAR_BITS(b00, b01, b02, b10, b11, b12, b20, b21, b22, b30, b31, b32, b40, b41, b42) \
      41                 :   ((b00 << 0) | (b01 << 1) | (b02 << 2) | (b10 << 3) | (b11 << 4) | (b12 << 5) | \
      42                 :    (b20 << 6) | (b21 << 7) | (b22 << 8) | (b30 << 9) | (b31 << 10) | (b32 << 11) | \
      43                 :    (b40 << 12) | (b41 << 13) | (b42 << 14))
      44                 : 
      45                 : static const PRUint16 glyphMicroFont[16] = {
      46                 :   CHAR_BITS(0, 1, 0,
      47                 :             1, 0, 1,
      48                 :             1, 0, 1,
      49                 :             1, 0, 1,
      50                 :             0, 1, 0),
      51                 :   CHAR_BITS(0, 1, 0,
      52                 :             0, 1, 0,
      53                 :             0, 1, 0,
      54                 :             0, 1, 0,
      55                 :             0, 1, 0),
      56                 :   CHAR_BITS(1, 1, 1,
      57                 :             0, 0, 1,
      58                 :             1, 1, 1,
      59                 :             1, 0, 0,
      60                 :             1, 1, 1),
      61                 :   CHAR_BITS(1, 1, 1,
      62                 :             0, 0, 1,
      63                 :             1, 1, 1,
      64                 :             0, 0, 1,
      65                 :             1, 1, 1),
      66                 :   CHAR_BITS(1, 0, 1,
      67                 :             1, 0, 1,
      68                 :             1, 1, 1,
      69                 :             0, 0, 1,
      70                 :             0, 0, 1),
      71                 :   CHAR_BITS(1, 1, 1,
      72                 :             1, 0, 0,
      73                 :             1, 1, 1,
      74                 :             0, 0, 1,
      75                 :             1, 1, 1),
      76                 :   CHAR_BITS(1, 1, 1,
      77                 :             1, 0, 0,
      78                 :             1, 1, 1,
      79                 :             1, 0, 1,
      80                 :             1, 1, 1),
      81                 :   CHAR_BITS(1, 1, 1,
      82                 :             0, 0, 1,
      83                 :             0, 0, 1,
      84                 :             0, 0, 1,
      85                 :             0, 0, 1),
      86                 :   CHAR_BITS(0, 1, 0,
      87                 :             1, 0, 1,
      88                 :             0, 1, 0,
      89                 :             1, 0, 1,
      90                 :             0, 1, 0),
      91                 :   CHAR_BITS(1, 1, 1,
      92                 :             1, 0, 1,
      93                 :             1, 1, 1,
      94                 :             0, 0, 1,
      95                 :             0, 0, 1),
      96                 :   CHAR_BITS(1, 1, 1,
      97                 :             1, 0, 1,
      98                 :             1, 1, 1,
      99                 :             1, 0, 1,
     100                 :             1, 0, 1),
     101                 :   CHAR_BITS(1, 1, 0,
     102                 :             1, 0, 1,
     103                 :             1, 1, 0,
     104                 :             1, 0, 1,
     105                 :             1, 1, 0),
     106                 :   CHAR_BITS(0, 1, 1,
     107                 :             1, 0, 0,
     108                 :             1, 0, 0,
     109                 :             1, 0, 0,
     110                 :             0, 1, 1),
     111                 :   CHAR_BITS(1, 1, 0,
     112                 :             1, 0, 1,
     113                 :             1, 0, 1,
     114                 :             1, 0, 1,
     115                 :             1, 1, 0),
     116                 :   CHAR_BITS(1, 1, 1,
     117                 :             1, 0, 0,
     118                 :             1, 1, 1,
     119                 :             1, 0, 0,
     120                 :             1, 1, 1),
     121                 :   CHAR_BITS(1, 1, 1,
     122                 :             1, 0, 0,
     123                 :             1, 1, 1,
     124                 :             1, 0, 0,
     125                 :             1, 0, 0)
     126                 : };
     127                 : 
     128                 : /* Parameters that control the rendering of hexboxes. They look like this:
     129                 : 
     130                 :         BMP codepoints           non-BMP codepoints
     131                 :       (U+0000 - U+FFFF)         (U+10000 - U+10FFFF)
     132                 : 
     133                 :          +---------+              +-------------+ 
     134                 :          |         |              |             |
     135                 :          | HHH HHH |              | HHH HHH HHH |
     136                 :          | HHH HHH |              | HHH HHH HHH |
     137                 :          | HHH HHH |              | HHH HHH HHH |
     138                 :          | HHH HHH |              | HHH HHH HHH |
     139                 :          | HHH HHH |              | HHH HHH HHH |
     140                 :          |         |              |             |
     141                 :          | HHH HHH |              | HHH HHH HHH |
     142                 :          | HHH HHH |              | HHH HHH HHH |
     143                 :          | HHH HHH |              | HHH HHH HHH |
     144                 :          | HHH HHH |              | HHH HHH HHH |
     145                 :          | HHH HHH |              | HHH HHH HHH |
     146                 :          |         |              |             |
     147                 :          +---------+              +-------------+
     148                 : */
     149                 : 
     150                 : /** Width of a minifont glyph (see above) */
     151                 : static const int MINIFONT_WIDTH = 3;
     152                 : /** Height of a minifont glyph (see above) */
     153                 : static const int MINIFONT_HEIGHT = 5;
     154                 : /**
     155                 :  * Gap between minifont glyphs (both horizontal and vertical) and also
     156                 :  * the minimum desired gap between the box border and the glyphs
     157                 :  */
     158                 : static const int HEX_CHAR_GAP = 1;
     159                 : /**
     160                 :  * The amount of space between the vertical edge of the glyphbox and the
     161                 :  * box border. We make this nonzero so that when multiple missing glyphs
     162                 :  * occur consecutively there's a gap between their rendered boxes.
     163                 :  */
     164                 : static const int BOX_HORIZONTAL_INSET = 1;
     165                 : /** The width of the border */
     166                 : static const int BOX_BORDER_WIDTH = 1;
     167                 : /**
     168                 :  * The scaling factor for the border opacity; this is multiplied by the current
     169                 :  * opacity being used to draw the text.
     170                 :  */
     171                 : static const gfxFloat BOX_BORDER_OPACITY = 0.5;
     172                 : /**
     173                 :  * Draw a single hex character using the current color. A nice way to do this
     174                 :  * would be to fill in an A8 image surface and then use it as a mask
     175                 :  * to paint the current color. Tragically this doesn't currently work with the
     176                 :  * Quartz cairo backend which doesn't generally support masking with surfaces.
     177                 :  * So for now we just paint a bunch of rectangles...
     178                 :  */
     179                 : static void
     180               0 : DrawHexChar(gfxContext *aContext, const gfxPoint& aPt, PRUint32 aDigit)
     181                 : {
     182               0 :     aContext->NewPath();
     183               0 :     PRUint32 glyphBits = glyphMicroFont[aDigit];
     184                 :     int x, y;
     185               0 :     for (y = 0; y < MINIFONT_HEIGHT; ++y) {
     186               0 :         for (x = 0; x < MINIFONT_WIDTH; ++x) {
     187               0 :             if (glyphBits & 1) {
     188               0 :                 aContext->Rectangle(gfxRect(x, y, 1, 1) + aPt, true);
     189                 :             }
     190               0 :             glyphBits >>= 1;
     191                 :         }
     192                 :     }
     193               0 :     aContext->Fill();
     194               0 : }
     195                 : 
     196                 : void
     197               0 : gfxFontMissingGlyphs::DrawMissingGlyph(gfxContext *aContext, const gfxRect& aRect,
     198                 :                                        PRUint32 aChar)
     199                 : {
     200               0 :     aContext->Save();
     201                 : 
     202               0 :     gfxRGBA currentColor;
     203               0 :     if (!aContext->GetDeviceColor(currentColor)) {
     204                 :         // We're currently drawing with some kind of pattern... Just draw
     205                 :         // the missing-glyph data in black.
     206               0 :         currentColor = gfxRGBA(0,0,0,1);
     207                 :     }
     208                 : 
     209                 :     // Stroke a rectangle so that the stroke's left edge is inset one pixel
     210                 :     // from the left edge of the glyph box and the stroke's right edge
     211                 :     // is inset one pixel from the right edge of the glyph box.
     212               0 :     gfxFloat halfBorderWidth = BOX_BORDER_WIDTH/2.0;
     213               0 :     gfxFloat borderLeft = aRect.X() + BOX_HORIZONTAL_INSET + halfBorderWidth;
     214               0 :     gfxFloat borderRight = aRect.XMost() - BOX_HORIZONTAL_INSET - halfBorderWidth;
     215               0 :     gfxRect borderStrokeRect(borderLeft, aRect.Y() + halfBorderWidth,
     216               0 :                              borderRight - borderLeft, aRect.Height() - 2*halfBorderWidth);
     217               0 :     if (!borderStrokeRect.IsEmpty()) {
     218               0 :         aContext->SetLineWidth(BOX_BORDER_WIDTH);
     219               0 :         aContext->SetDash(gfxContext::gfxLineSolid);
     220               0 :         aContext->SetLineCap(gfxContext::LINE_CAP_SQUARE);
     221               0 :         aContext->SetLineJoin(gfxContext::LINE_JOIN_MITER);
     222               0 :         gfxRGBA color = currentColor;
     223               0 :         color.a *= BOX_BORDER_OPACITY;
     224               0 :         aContext->SetDeviceColor(color);
     225               0 :         aContext->NewPath();
     226               0 :         aContext->Rectangle(borderStrokeRect);
     227                 : 
     228                 : #ifdef MOZ_GFX_OPTIMIZE_MOBILE
     229                 :         aContext->Fill();
     230                 : #else
     231               0 :         aContext->Stroke();
     232                 : #endif
     233                 :     }
     234                 : 
     235                 : #ifndef MOZ_GFX_OPTIMIZE_MOBILE
     236               0 :     gfxPoint center(aRect.X() + aRect.Width()/2,
     237               0 :                     aRect.Y() + aRect.Height()/2);
     238               0 :     gfxFloat halfGap = HEX_CHAR_GAP/2.0;
     239               0 :     gfxFloat top = -(MINIFONT_HEIGHT + halfGap);
     240               0 :     if (aChar < 0x10000) {
     241               0 :         if (aRect.Width() >= 2*MINIFONT_WIDTH + HEX_CHAR_GAP &&
     242               0 :             aRect.Height() >= 2*MINIFONT_HEIGHT + HEX_CHAR_GAP) {
     243                 :             // Draw 4 digits for BMP
     244               0 :             aContext->SetDeviceColor(currentColor);
     245               0 :             gfxFloat left = -(MINIFONT_WIDTH + halfGap);
     246                 :             DrawHexChar(aContext,
     247               0 :                         center + gfxPoint(left, top), (aChar >> 12) & 0xF);
     248                 :             DrawHexChar(aContext,
     249               0 :                         center + gfxPoint(halfGap, top), (aChar >> 8) & 0xF);
     250                 :             DrawHexChar(aContext,
     251               0 :                         center + gfxPoint(left, halfGap), (aChar >> 4) & 0xF);
     252                 :             DrawHexChar(aContext,
     253               0 :                         center + gfxPoint(halfGap, halfGap), aChar & 0xF);
     254                 :         }
     255                 :     } else {
     256               0 :         if (aRect.Width() >= 3*MINIFONT_WIDTH + 2*HEX_CHAR_GAP &&
     257               0 :             aRect.Height() >= 2*MINIFONT_HEIGHT + HEX_CHAR_GAP) {
     258                 :             // Draw 6 digits for non-BMP
     259               0 :             aContext->SetDeviceColor(currentColor);
     260               0 :             gfxFloat first = -(MINIFONT_WIDTH * 1.5 + HEX_CHAR_GAP);
     261               0 :             gfxFloat second = -(MINIFONT_WIDTH / 2.0);
     262               0 :             gfxFloat third = (MINIFONT_WIDTH / 2.0 + HEX_CHAR_GAP);
     263                 :             DrawHexChar(aContext,
     264               0 :                         center + gfxPoint(first, top), (aChar >> 20) & 0xF);
     265                 :             DrawHexChar(aContext,
     266               0 :                         center + gfxPoint(second, top), (aChar >> 16) & 0xF);
     267                 :             DrawHexChar(aContext,
     268               0 :                         center + gfxPoint(third, top), (aChar >> 12) & 0xF);
     269                 :             DrawHexChar(aContext,
     270               0 :                         center + gfxPoint(first, halfGap), (aChar >> 8) & 0xF);
     271                 :             DrawHexChar(aContext,
     272               0 :                         center + gfxPoint(second, halfGap), (aChar >> 4) & 0xF);
     273                 :             DrawHexChar(aContext,
     274               0 :                         center + gfxPoint(third, halfGap), aChar & 0xF);
     275                 :         }
     276                 :     }
     277                 : #endif
     278                 : 
     279               0 :     aContext->Restore();
     280               0 : }
     281                 : 
     282                 : gfxFloat
     283               0 : gfxFontMissingGlyphs::GetDesiredMinWidth(PRUint32 aChar)
     284                 : {
     285                 : /**
     286                 :  * The minimum desired width for a missing-glyph glyph box. I've laid it out
     287                 :  * like this so you can see what goes where.
     288                 :  */
     289                 :     return BOX_HORIZONTAL_INSET + BOX_BORDER_WIDTH + HEX_CHAR_GAP +
     290                 :         MINIFONT_WIDTH + HEX_CHAR_GAP + MINIFONT_WIDTH +
     291                 :          ((aChar < 0x10000) ? 0 : HEX_CHAR_GAP + MINIFONT_WIDTH) +
     292               0 :         HEX_CHAR_GAP + BOX_BORDER_WIDTH + BOX_HORIZONTAL_INSET;
     293                 : }

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