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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkView.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkCanvas.h"
     12 #include "SkColorShader.h"
     13 #include "SkGradientShader.h"
     14 #include "SkGraphics.h"
     15 #include "SkImageDecoder.h"
     16 #include "SkPath.h"
     17 #include "SkRandom.h"
     18 #include "SkRegion.h"
     19 #include "SkShader.h"
     20 #include "SkUtils.h"
     21 #include "SkXfermode.h"
     22 #include "SkColorPriv.h"
     23 #include "SkColorFilter.h"
     24 #include "SkTime.h"
     25 #include "SkTypeface.h"
     26 #include "SkTextBox.h"
     27 #include "SkOSFile.h"
     28 #include "SkStream.h"
     29 #include "SkKey.h"
     30 
     31 extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
     32 
     33 #if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
     34 extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
     35 #endif
     36 
     37 static const char gText[] =
     38     "When in the Course of human events it becomes necessary for one people "
     39     "to dissolve the political bands which have connected them with another "
     40     "and to assume among the powers of the earth, the separate and equal "
     41     "station to which the Laws of Nature and of Nature's God entitle them, "
     42     "a decent respect to the opinions of mankind requires that they should "
     43     "declare the causes which impel them to the separation.";
     44 
     45 class TextBoxView : public SampleView {
     46 public:
     47     TextBoxView() {
     48 #if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
     49         LOGFONT lf;
     50         sk_bzero(&lf, sizeof(lf));
     51         lf.lfHeight = 9;
     52         SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
     53         lf.lfHeight = 12;
     54         SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
     55         // we assert that different sizes should not affect which face we get
     56         SkASSERT(tf0 == tf1);
     57         tf0->unref();
     58         tf1->unref();
     59 #endif
     60     }
     61 
     62 protected:
     63     // overrides from SkEventSink
     64     virtual bool onQuery(SkEvent* evt)  {
     65         if (SampleCode::TitleQ(*evt)) {
     66             SampleCode::TitleR(evt, "TextBox");
     67             return true;
     68         }
     69         return this->INHERITED::onQuery(evt);
     70     }
     71 
     72     void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
     73         SkAutoCanvasRestore acr(canvas, true);
     74 
     75         canvas->clipRect(SkRect::MakeWH(w, h));
     76         canvas->drawColor(bg);
     77         SkScalar margin = 20;
     78         SkTextBox tbox;
     79         tbox.setMode(SkTextBox::kLineBreak_Mode);
     80         tbox.setBox(margin, margin,
     81                     w - margin, h - margin);
     82         tbox.setSpacing(SkIntToScalar(3)/3, 0);
     83 
     84         SkPaint paint;
     85         paint.setAntiAlias(true);
     86         paint.setLCDRenderText(true);
     87         paint.setColor(fg);
     88         tbox.setText(gText, strlen(gText), paint);
     89 
     90         for (int i = 9; i < 24; i += 2) {
     91             paint.setTextSize(SkIntToScalar(i));
     92             tbox.draw(canvas);
     93             canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
     94         }
     95     }
     96 
     97     virtual void onDrawContent(SkCanvas* canvas) {
     98         SkScalar width = this->width() / 3;
     99         drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
    100         canvas->translate(width, 0);
    101         drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
    102         canvas->translate(width, 0);
    103         drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
    104         canvas->translate(0, this->height()/2);
    105         drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
    106     }
    107 
    108 private:
    109     typedef SampleView INHERITED;
    110 };
    111 
    112 //////////////////////////////////////////////////////////////////////////////
    113 
    114 static SkView* MyFactory() { return new TextBoxView; }
    115 static SkViewRegister reg(MyFactory);
    116