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 "SkBlurMask.h" 10#include "SkBlurMaskFilter.h" 11#include "SkCanvas.h" 12#include "SkDevice.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 "SkView.h" 27 28#include "SkOSFile.h" 29#include "SkStream.h" 30 31static void check_for_nonwhite(const SkBitmap& bm, int alpha) { 32 if (bm.colorType() != kRGB_565_SkColorType) { 33 return; 34 } 35 36 for (int y = 0; y < bm.height(); y++) { 37 for (int x = 0; x < bm.width(); x++) { 38 uint16_t c = *bm.getAddr16(x, y); 39 if (c != 0xFFFF) { 40 SkDebugf("------ nonwhite alpha=%x [%d %d] %x\n", alpha, x, y, c); 41 return; 42 } 43 } 44 } 45} 46 47class TextAlphaView : public SampleView { 48public: 49 TextAlphaView() { 50 fByte = 0xFF; 51 } 52 53protected: 54 // overrides from SkEventSink 55 virtual bool onQuery(SkEvent* evt) { 56 if (SampleCode::TitleQ(*evt)) { 57 SampleCode::TitleR(evt, "TextAlpha"); 58 return true; 59 } 60 return this->INHERITED::onQuery(evt); 61 } 62 63 virtual void onDrawContent(SkCanvas* canvas) { 64 const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 65 SkPaint paint; 66 SkScalar x = SkIntToScalar(10); 67 SkScalar y = SkIntToScalar(20); 68 69 paint.setFlags(0x105); 70 71 paint.setARGB(fByte, 0xFF, 0xFF, 0xFF); 72 73 paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle, 74 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)))); 75 paint.getMaskFilter()->unref(); 76 77 SkRandom rand; 78 79 for (int ps = 6; ps <= 35; ps++) { 80 paint.setColor(rand.nextU() | (0xFF << 24)); 81 paint.setTextSize(SkIntToScalar(ps)); 82 paint.setTextSize(SkIntToScalar(24)); 83 canvas->drawText(str, strlen(str), x, y, paint); 84 y += paint.getFontMetrics(NULL); 85 } 86 if (false) { // avoid bit rot, suppress warning 87 check_for_nonwhite(canvas->getDevice()->accessBitmap(false), fByte); 88 SkDebugf("------ byte %x\n", fByte); 89 } 90 91 if (false) { 92 fByte += 1; 93 fByte &= 0xFF; 94 this->inval(NULL); 95 } 96 } 97 98 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) SK_OVERRIDE { 99 return new Click(this); 100 } 101 102 virtual bool onClick(Click* click) { 103 int y = click->fICurr.fY; 104 if (y < 0) { 105 y = 0; 106 } else if (y > 255) { 107 y = 255; 108 } 109 fByte = y; 110 this->inval(NULL); 111 return true; 112 } 113 114private: 115 int fByte; 116 117 typedef SampleView INHERITED; 118}; 119 120////////////////////////////////////////////////////////////////////////////// 121 122static SkView* MyFactory() { return new TextAlphaView; } 123static SkViewRegister reg(MyFactory); 124