1/* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "gm.h" 9#include "sk_tool_utils.h" 10#include "SkImageSource.h" 11#include "SkMagnifierImageFilter.h" 12#include "SkPixelRef.h" 13#include "SkRandom.h" 14#include "SkSurface.h" 15 16#define WIDTH 500 17#define HEIGHT 500 18 19DEF_SIMPLE_GM_BG(imagemagnifier, canvas, WIDTH, HEIGHT, SK_ColorBLACK) { 20 SkPaint filterPaint; 21 filterPaint.setImageFilter( 22 SkMagnifierImageFilter::Make( 23 SkRect::MakeXYWH(SkIntToScalar(100), SkIntToScalar(100), 24 SkIntToScalar(WIDTH / 2), 25 SkIntToScalar(HEIGHT / 2)), 26 100, nullptr)); 27 canvas->saveLayer(nullptr, &filterPaint); 28 const char* str = "The quick brown fox jumped over the lazy dog."; 29 SkRandom rand; 30 for (int i = 0; i < 25; ++i) { 31 int x = rand.nextULessThan(WIDTH); 32 int y = rand.nextULessThan(HEIGHT); 33 SkPaint paint; 34 sk_tool_utils::set_portable_typeface(&paint); 35 paint.setColor(sk_tool_utils::color_to_565(rand.nextBits(24) | 0xFF000000)); 36 paint.setTextSize(rand.nextRangeScalar(0, 300)); 37 paint.setAntiAlias(true); 38 canvas->drawText(str, strlen(str), SkIntToScalar(x), 39 SkIntToScalar(y), paint); 40 } 41 canvas->restore(); 42} 43 44//////////////////////////////////////////////////////////////////////////////// 45#define WIDTH_HEIGHT 256 46 47static sk_sp<SkImage> make_img() { 48 SkBitmap bitmap; 49 bitmap.allocN32Pixels(WIDTH_HEIGHT, WIDTH_HEIGHT); 50 SkCanvas canvas(bitmap); 51 52 canvas.clear(0x0); 53 54 SkPaint paint; 55 paint.setColor(SK_ColorBLUE); 56 57 for (float pos = 0; pos < WIDTH_HEIGHT; pos += 16) { 58 canvas.drawLine(0, pos, SkIntToScalar(WIDTH_HEIGHT), pos, paint); 59 canvas.drawLine(pos, 0, pos, SkIntToScalar(WIDTH_HEIGHT), paint); 60 } 61 62 SkBitmap result; 63 result.setInfo(SkImageInfo::MakeS32(WIDTH_HEIGHT, WIDTH_HEIGHT, kPremul_SkAlphaType)); 64 result.setPixelRef(sk_ref_sp(bitmap.pixelRef()), 0, 0); 65 66 return SkImage::MakeFromBitmap(result); 67} 68 69DEF_SIMPLE_GM_BG(imagemagnifier_cropped, canvas, WIDTH_HEIGHT, WIDTH_HEIGHT, SK_ColorBLACK) { 70 71 sk_sp<SkImage> image(make_img()); 72 73 sk_sp<SkImageFilter> imageSource(SkImageSource::Make(std::move(image))); 74 75 SkRect srcRect = SkRect::MakeWH(SkIntToScalar(WIDTH_HEIGHT-32), 76 SkIntToScalar(WIDTH_HEIGHT-32)); 77 srcRect.inset(64.0f, 64.0f); 78 79 constexpr SkScalar kInset = 64.0f; 80 81 // Crop out a 16 pixel ring around the result 82 const SkRect rect = SkRect::MakeXYWH(16, 16, WIDTH_HEIGHT-32, WIDTH_HEIGHT-32); 83 SkImageFilter::CropRect cropRect(rect); 84 85 SkPaint filterPaint; 86 filterPaint.setImageFilter(SkMagnifierImageFilter::Make(srcRect, kInset, 87 std::move(imageSource), 88 &cropRect)); 89 90 canvas->saveLayer(nullptr, &filterPaint); 91 canvas->restore(); 92} 93