1 /*
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3 *
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17 *
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28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "UniscribeHelperTextRun.h"
33
34 #include "Font.h"
35 #include "PlatformBridge.h"
36 #include "SimpleFontData.h"
37 #include "TextRun.h"
38
39 namespace WebCore {
40
UniscribeHelperTextRun(const TextRun & run,const Font & font)41 UniscribeHelperTextRun::UniscribeHelperTextRun(const TextRun& run,
42 const Font& font)
43 : UniscribeHelper(run.characters(), run.length(), run.rtl(),
44 font.primaryFont()->platformData().hfont(),
45 font.primaryFont()->platformData().scriptCache(),
46 font.primaryFont()->platformData().scriptFontProperties(),
47 font.primaryFont()->spaceGlyph())
48 , m_font(&font)
49 , m_fontIndex(0)
50 {
51 setDirectionalOverride(run.directionalOverride());
52 setLetterSpacing(font.letterSpacing());
53 setSpaceWidth(font.spaceWidth());
54 setWordSpacing(font.wordSpacing());
55 setAscent(font.fontMetrics().ascent());
56
57 init();
58
59 // Expansion is the amount to add to make justification happen. This
60 // should be done after Init() so all the runs are already measured.
61 if (run.expansion() > 0)
62 justify(run.expansion());
63 }
64
UniscribeHelperTextRun(const wchar_t * input,int inputLength,bool isRtl,HFONT hfont,SCRIPT_CACHE * scriptCache,SCRIPT_FONTPROPERTIES * fontProperties)65 UniscribeHelperTextRun::UniscribeHelperTextRun(
66 const wchar_t* input,
67 int inputLength,
68 bool isRtl,
69 HFONT hfont,
70 SCRIPT_CACHE* scriptCache,
71 SCRIPT_FONTPROPERTIES* fontProperties)
72 : UniscribeHelper(input, inputLength, isRtl, hfont,
73 scriptCache, fontProperties, 0)
74 , m_font(0)
75 , m_fontIndex(-1)
76 {
77 }
78
tryToPreloadFont(HFONT font)79 void UniscribeHelperTextRun::tryToPreloadFont(HFONT font)
80 {
81 // Ask the browser to get the font metrics for this font.
82 // That will preload the font and it should now be accessible
83 // from the renderer.
84 PlatformBridge::ensureFontLoaded(font);
85 }
86
nextWinFontData(HFONT * hfont,SCRIPT_CACHE ** scriptCache,SCRIPT_FONTPROPERTIES ** fontProperties,int * ascent)87 bool UniscribeHelperTextRun::nextWinFontData(
88 HFONT* hfont,
89 SCRIPT_CACHE** scriptCache,
90 SCRIPT_FONTPROPERTIES** fontProperties,
91 int* ascent)
92 {
93 // This check is necessary because NextWinFontData can be called again
94 // after we already ran out of fonts. fontDataAt behaves in a strange
95 // manner when the difference between param passed and # of fonts stored in
96 // WebKit::Font is larger than one. We can avoid this check by setting
97 // font_index_ to # of elements in hfonts_ when we run out of font. In that
98 // case, we'd have to go through a couple of more checks before returning
99 // false.
100 if (m_fontIndex == -1 || !m_font)
101 return false;
102
103 // If the font data for a fallback font requested is not yet retrieved, add
104 // them to our vectors. Note that '>' rather than '>=' is used to test that
105 // condition. primaryFont is not stored in hfonts_, and friends so that
106 // indices for fontDataAt and our vectors for font data are 1 off from each
107 // other. That is, when fully populated, hfonts_ and friends have one font
108 // fewer than what's contained in font_.
109 if (static_cast<size_t>(++m_fontIndex) > m_hfonts.size()) {
110 const FontData *fontData = m_font->fontDataAt(m_fontIndex);
111 if (!fontData) {
112 // Ran out of fonts.
113 m_fontIndex = -1;
114 return false;
115 }
116
117 // FIXME: this won't work for SegmentedFontData
118 // http://crbug.com/6425
119 const SimpleFontData* simpleFontData =
120 fontData->fontDataForCharacter(' ');
121
122 m_hfonts.append(simpleFontData->platformData().hfont());
123 m_scriptCaches.append(simpleFontData->platformData().scriptCache());
124 m_fontProperties.append(simpleFontData->platformData().scriptFontProperties());
125 m_ascents.append(simpleFontData->fontMetrics().ascent());
126 }
127
128 *hfont = m_hfonts[m_fontIndex - 1];
129 *scriptCache = m_scriptCaches[m_fontIndex - 1];
130 *fontProperties = m_fontProperties[m_fontIndex - 1];
131 *ascent = m_ascents[m_fontIndex - 1];
132 return true;
133 }
134
resetFontIndex()135 void UniscribeHelperTextRun::resetFontIndex()
136 {
137 m_fontIndex = 0;
138 }
139
140 } // namespace WebCore
141