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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 // This is a test program that uses Minikin to layout and draw some text.
     18 // At the moment, it just draws a string into /data/local/tmp/foo.pgm.
     19 
     20 #include <stdio.h>
     21 #include <vector>
     22 #include <fstream>
     23 
     24 #include <unicode/unistr.h>
     25 #include <unicode/utf16.h>
     26 
     27 #include <minikin/MinikinFontFreeType.h>
     28 #include <minikin/Layout.h>
     29 
     30 #include <SkCanvas.h>
     31 #include <SkGraphics.h>
     32 #include <SkImageEncoder.h>
     33 #include <SkTypeface.h>
     34 #include <SkPaint.h>
     35 
     36 #include "MinikinSkia.h"
     37 
     38 using std::vector;
     39 
     40 namespace android {
     41 
     42 FT_Library library;  // TODO: this should not be a global
     43 
     44 FontCollection *makeFontCollection() {
     45     vector<FontFamily *>typefaces;
     46     const char *fns[] = {
     47         "/system/fonts/Roboto-Regular.ttf",
     48         "/system/fonts/Roboto-Italic.ttf",
     49         "/system/fonts/Roboto-BoldItalic.ttf",
     50         "/system/fonts/Roboto-Light.ttf",
     51         "/system/fonts/Roboto-Thin.ttf",
     52         "/system/fonts/Roboto-Bold.ttf",
     53         "/system/fonts/Roboto-ThinItalic.ttf",
     54         "/system/fonts/Roboto-LightItalic.ttf"
     55     };
     56 
     57     FontFamily *family = new FontFamily();
     58     for (size_t i = 0; i < sizeof(fns)/sizeof(fns[0]); i++) {
     59         const char *fn = fns[i];
     60         SkTypeface *skFace = SkTypeface::CreateFromFile(fn);
     61         MinikinFont *font = new MinikinFontSkia(skFace);
     62         family->addFont(font);
     63     }
     64     typefaces.push_back(family);
     65 
     66 #if 1
     67     family = new FontFamily();
     68     const char *fn = "/system/fonts/DroidSansDevanagari-Regular.ttf";
     69     SkTypeface *skFace = SkTypeface::CreateFromFile(fn);
     70     MinikinFont *font = new MinikinFontSkia(skFace);
     71     family->addFont(font);
     72     typefaces.push_back(family);
     73 #endif
     74 
     75     return new FontCollection(typefaces);
     76 }
     77 
     78 // Maybe move to MinikinSkia (esp. instead of opening GetSkTypeface publicly)?
     79 
     80 void drawToSkia(SkCanvas *canvas, SkPaint *paint, Layout *layout, float x, float y) {
     81     size_t nGlyphs = layout->nGlyphs();
     82     uint16_t *glyphs = new uint16_t[nGlyphs];
     83     SkPoint *pos = new SkPoint[nGlyphs];
     84     SkTypeface *lastFace = NULL;
     85     SkTypeface *skFace = NULL;
     86     size_t start = 0;
     87 
     88     paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
     89     for (size_t i = 0; i < nGlyphs; i++) {
     90         MinikinFontSkia *mfs = static_cast<MinikinFontSkia *>(layout->getFont(i));
     91         skFace = mfs->GetSkTypeface();
     92         glyphs[i] = layout->getGlyphId(i);
     93         pos[i].fX = x + layout->getX(i);
     94         pos[i].fY = y + layout->getY(i);
     95         if (i > 0 && skFace != lastFace) {
     96             paint->setTypeface(lastFace);
     97             canvas->drawPosText(glyphs + start, (i - start) << 1, pos + start, *paint);
     98             start = i;
     99         }
    100         lastFace = skFace;
    101     }
    102     paint->setTypeface(skFace);
    103     canvas->drawPosText(glyphs + start, (nGlyphs - start) << 1, pos + start, *paint);
    104     delete[] glyphs;
    105     delete[] pos;
    106 }
    107 
    108 int runMinikinTest() {
    109     FT_Error error = FT_Init_FreeType(&library);
    110     if (error) {
    111         return -1;
    112     }
    113     Layout::init();
    114 
    115     FontCollection *collection = makeFontCollection();
    116     Layout layout;
    117     layout.setFontCollection(collection);
    118     const char *text = "fine world \xe0\xa4\xa8\xe0\xa4\xae\xe0\xa4\xb8\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa5\x87";
    119     int bidiFlags = 0;
    120     FontStyle fontStyle(7);
    121     MinikinPaint minikinPaint;
    122     minikinPaint.size = 32;
    123     icu::UnicodeString icuText = icu::UnicodeString::fromUTF8(text);
    124     layout.doLayout(icuText.getBuffer(), 0, icuText.length(), icuText.length(), bidiFlags, fontStyle, minikinPaint);
    125     layout.dump();
    126 
    127     SkAutoGraphics ag;
    128 
    129     int width = 800;
    130     int height = 600;
    131     SkBitmap bitmap;
    132     bitmap.allocN32Pixels(width, height);
    133     SkCanvas canvas(bitmap);
    134     SkPaint paint;
    135     paint.setARGB(255, 0, 0, 128);
    136     paint.setStyle(SkPaint::kStroke_Style);
    137     paint.setStrokeWidth(2);
    138     paint.setTextSize(100);
    139     paint.setAntiAlias(true);
    140     canvas.drawLine(10, 300, 10 + layout.getAdvance(), 300, paint);
    141     paint.setStyle(SkPaint::kFill_Style);
    142     drawToSkia(&canvas, &paint, &layout, 10, 300);
    143 
    144     SkImageEncoder::EncodeFile("/data/local/tmp/foo.png", bitmap, SkImageEncoder::kPNG_Type, 100);
    145     return 0;
    146 }
    147 
    148 }
    149 
    150 int main(int argc, const char** argv) {
    151     return android::runMinikinTest();
    152 }
    153