1 #include "SkScalerContext.h"
2 #include "SkBitmap.h"
3 #include "SkCanvas.h"
4 #include "SkDescriptor.h"
5 #include "SkFDot6.h"
6 #include "SkFontHost.h"
7 #include "SkMask.h"
8 #include "SkStream.h"
9 #include "SkString.h"
10 #include "SkThread.h"
11 #include "SkTemplates.h"
12
13 #include <acaapi.h>
14
15 //////////////////////////////////////////////////////////////////////////
16
17 #include "SkMMapStream.h"
18
19 class SkScalerContext_Ascender : public SkScalerContext {
20 public:
21 SkScalerContext_Ascender(const SkDescriptor* desc);
22 virtual ~SkScalerContext_Ascender();
23
24 protected:
25 virtual unsigned generateGlyphCount();
26 virtual uint16_t generateCharToGlyph(SkUnichar uni);
27 virtual void generateMetrics(SkGlyph* glyph);
28 virtual void generateImage(const SkGlyph& glyph);
29 virtual void generatePath(const SkGlyph& glyph, SkPath* path);
30 virtual void generateFontMetrics(SkPaint::FontMetrics* mx, SkPaint::FontMetrics* my);
31
32 private:
33 aca_FontHandle fHandle;
34 void* fWorkspace;
35 void* fGlyphWorkspace;
36 SkStream* fFontStream;
37 SkStream* fHintStream;
38 };
39
40 ///////////////////////////////////////////////////////////////////////////
41 ///////////////////////////////////////////////////////////////////////////
42
SkScalerContext_Ascender(const SkDescriptor * desc)43 SkScalerContext_Ascender::SkScalerContext_Ascender(const SkDescriptor* desc)
44 : SkScalerContext(desc)
45 {
46 int size = aca_Get_FontHandleRec_Size();
47 fHandle = (aca_FontHandle)sk_malloc_throw(size);
48
49 // get the pointer to the font
50
51 fFontStream = new SkMMAPStream("/UcsGB2312-Hei-H.FDL");
52 fHintStream = new SkMMAPStream("/genv6-23.bin");
53
54 void* hints = sk_malloc_throw(fHintStream->getLength());
55 memcpy(hints, fHintStream->getMemoryBase(), fHintStream->getLength());
56
57 aca_Create_Font_Handle(fHandle,
58 (void*)fFontStream->getMemoryBase(), fFontStream->getLength(),
59 "fred",
60 hints, fHintStream->getLength());
61
62 // compute our factors from the record
63
64 SkMatrix m;
65
66 fRec.getSingleMatrix(&m);
67
68 // now compute our scale factors
69 SkScalar sx = m.getScaleX();
70 SkScalar sy = m.getScaleY();
71
72 int ppemX = SkScalarRound(sx);
73 int ppemY = SkScalarRound(sy);
74
75 size = aca_Find_Font_Memory_Required(fHandle, ppemX, ppemY);
76 size *= 8; // Jeff suggests this :)
77 fWorkspace = sk_malloc_throw(size);
78 aca_Set_Font_Memory(fHandle, (uint8_t*)fWorkspace, size);
79
80 aca_GlyphAttribsRec rec;
81
82 memset(&rec, 0, sizeof(rec));
83 rec.xSize = ppemX;
84 rec.ySize = ppemY;
85 rec.doAdjust = true;
86 rec.doExceptions = true;
87 rec.doGlyphHints = true;
88 rec.doInterpolate = true;
89 rec.grayMode = 2;
90 aca_Set_Font_Attributes(fHandle, &rec, &size);
91
92 fGlyphWorkspace = sk_malloc_throw(size);
93 aca_Set_Glyph_Memory(fHandle, fGlyphWorkspace);
94 }
95
~SkScalerContext_Ascender()96 SkScalerContext_Ascender::~SkScalerContext_Ascender()
97 {
98 delete fHintStream;
99 delete fFontStream;
100 sk_free(fGlyphWorkspace);
101 sk_free(fWorkspace);
102 sk_free(fHandle);
103 }
104
generateGlyphCount()105 unsigned SkScalerContext_Ascender::generateGlyphCount()
106 {
107 return 1000;
108 }
109
generateCharToGlyph(SkUnichar uni)110 uint16_t SkScalerContext_Ascender::generateCharToGlyph(SkUnichar uni)
111 {
112 return (uint16_t)(uni & 0xFFFF);
113 }
114
generateMetrics(SkGlyph * glyph)115 void SkScalerContext_Ascender::generateMetrics(SkGlyph* glyph)
116 {
117 glyph->fRsbDelta = 0;
118 glyph->fLsbDelta = 0;
119
120 aca_GlyphImageRec rec;
121 aca_Vector topLeft;
122
123 int adv = aca_Get_Adv_Width(fHandle, glyph->getGlyphID());
124 if (aca_GLYPH_NOT_PRESENT == adv)
125 goto ERROR;
126
127 aca_Rasterize(glyph->getGlyphID(), fHandle, &rec, &topLeft);
128
129 if (false) // error
130 {
131 ERROR:
132 glyph->fWidth = 0;
133 glyph->fHeight = 0;
134 glyph->fTop = 0;
135 glyph->fLeft = 0;
136 glyph->fAdvanceX = 0;
137 glyph->fAdvanceY = 0;
138 return;
139 }
140
141 glyph->fWidth = rec.width;
142 glyph->fHeight = rec.rows;
143 glyph->fRowBytes = rec.width;
144 glyph->fTop = -topLeft.y;
145 glyph->fLeft = topLeft.x;
146 glyph->fAdvanceX = SkIntToFixed(adv);
147 glyph->fAdvanceY = SkIntToFixed(0);
148 }
149
generateImage(const SkGlyph & glyph)150 void SkScalerContext_Ascender::generateImage(const SkGlyph& glyph)
151 {
152 aca_GlyphImageRec rec;
153 aca_Vector topLeft;
154
155 aca_Rasterize(glyph.getGlyphID(), fHandle, &rec, &topLeft);
156
157 const uint8_t* src = (const uint8_t*)rec.buffer;
158 uint8_t* dst = (uint8_t*)glyph.fImage;
159 int height = glyph.fHeight;
160
161 src += rec.y0 * rec.pitch + rec.x0;
162 while (--height >= 0)
163 {
164 memcpy(dst, src, glyph.fWidth);
165 src += rec.pitch;
166 dst += glyph.fRowBytes;
167 }
168 }
169
170 ///////////////////////////////////////////////////////////////////////////////////////////
171
generatePath(const SkGlyph & glyph,SkPath * path)172 void SkScalerContext_Ascender::generatePath(const SkGlyph& glyph, SkPath* path)
173 {
174 SkRect r;
175
176 r.set(0, 0, SkIntToScalar(4), SkIntToScalar(4));
177 path->reset();
178 path->addRect(r);
179 }
180
generateFontMetrics(SkPaint::FontMetrics * mx,SkPaint::FontMetrics * my)181 void SkScalerContext_Ascender::generateFontMetrics(SkPaint::FontMetrics* mx, SkPaint::FontMetrics* my)
182 {
183 if (NULL == mx && NULL == my)
184 return;
185
186 if (mx)
187 {
188 mx->fTop = SkIntToScalar(-16);
189 mx->fAscent = SkIntToScalar(-16);
190 mx->fDescent = SkIntToScalar(4);
191 mx->fBottom = SkIntToScalar(4);
192 mx->fLeading = 0;
193
194 // FIXME:
195 mx->fAvgCharWidth = 0;
196 mx->fXMin = 0;
197 mx->fXMax = 0;
198 mx->fXHeight = 0;
199 }
200 if (my)
201 {
202 my->fTop = SkIntToScalar(-16);
203 my->fAscent = SkIntToScalar(-16);
204 my->fDescent = SkIntToScalar(4);
205 my->fBottom = SkIntToScalar(4);
206 my->fLeading = 0;
207
208 // FIXME:
209 my->fAvgCharWidth = 0;
210 my->fXMin = 0;
211 my->fXMax = 0;
212 my->fXHeight = 0;
213 }
214 }
215
216 ////////////////////////////////////////////////////////////////////////
217 ////////////////////////////////////////////////////////////////////////
218
CreateScalerContext(const SkDescriptor * desc)219 SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc)
220 {
221 return SkNEW_ARGS(SkScalerContext_Ascender, (desc));
222 }
223
224