Add Chinese zoom Sample.
Bug: skia:
Change-Id: Ibe5ffee64fe9fccd6b8d86c1310a78d2d51e424e
Reviewed-on: https://skia-review.googlesource.com/97065
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/samplecode/SampleChineseFling.cpp b/samplecode/SampleChineseFling.cpp
index 0136631..cf14013 100644
--- a/samplecode/SampleChineseFling.cpp
+++ b/samplecode/SampleChineseFling.cpp
@@ -15,6 +15,10 @@
#include "SkTypeface.h"
#include "SkTextBlob.h"
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#endif
+
static void make_paint(SkPaint* paint, sk_sp<SkTypeface> typeface) {
static const int kTextSize = 56;
@@ -124,7 +128,134 @@
typedef SkView INHERITED;
};
+class ChineseZoomView : public SampleView {
+public:
+ ChineseZoomView() : fBlobs(kNumBlobs), fScale(1.0f) {}
+
+protected:
+ bool onQuery(SkEvent* evt) override {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "chinese-zoom");
+ return true;
+ }
+ SkUnichar uni;
+ if (SampleCode::CharQ(*evt, &uni)) {
+ if ('>' == uni) {
+ fScale += 0.125f;
+ return true;
+ }
+ if ('<' == uni) {
+ fScale -= 0.125f;
+ return true;
+ }
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void onDrawContent(SkCanvas* canvas) override {
+ if (!fInitialized) {
+ this->init();
+ fInitialized = true;
+ }
+
+ canvas->clear(0xFFDDDDDD);
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setColor(0xDE000000);
+ paint.setTypeface(fTypeface);
+ paint.setTextSize(11);
+ paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
+
+#if SK_SUPPORT_GPU
+ GrContext* grContext = canvas->getGrContext();
+ if (grContext) {
+ sk_sp<SkImage> image =
+ grContext->getFontAtlasImage_ForTesting(GrMaskFormat::kA8_GrMaskFormat, 0);
+ canvas->drawImageRect(image,
+ SkRect::MakeXYWH(512.0f, 10.0f, 512.0f, 512.0), &paint);
+ image = grContext->getFontAtlasImage_ForTesting(GrMaskFormat::kA8_GrMaskFormat, 1);
+ canvas->drawImageRect(image,
+ SkRect::MakeXYWH(1024.0f, 10.0f, 512.f, 512.0f), &paint);
+ image = grContext->getFontAtlasImage_ForTesting(GrMaskFormat::kA8_GrMaskFormat, 2);
+ canvas->drawImageRect(image,
+ SkRect::MakeXYWH(512.0f, 522.0f, 512.0f, 512.0f), &paint);
+ image = grContext->getFontAtlasImage_ForTesting(GrMaskFormat::kA8_GrMaskFormat, 3);
+ canvas->drawImageRect(image,
+ SkRect::MakeXYWH(1024.0f, 522.0f, 512.0f, 512.0f), &paint);
+ }
+#endif
+
+ canvas->scale(fScale, fScale);
+
+ // draw a consistent run of the 'words' - one word per line
+ SkScalar y = 0;
+ for (int index = 0; index < kNumBlobs; ++index) {
+ y += -fMetrics.fAscent;
+ canvas->drawTextBlob(fBlobs[index], 0, y, paint);
+
+ y += 3*(fMetrics.fDescent - fMetrics.fAscent + fMetrics.fLeading);
+ }
+ }
+
+private:
+ static constexpr auto kNumBlobs = 8;
+ static constexpr auto kParagraphLength = 175;
+
+ void init() {
+ fTypeface = chinese_typeface();
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setColor(0xDE000000);
+ paint.setTypeface(fTypeface);
+ paint.setTextSize(11);
+ paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
+
+ paint.getFontMetrics(&fMetrics);
+
+ SkUnichar glyphs[45];
+ for (int32_t i = 0; i < kNumBlobs; ++i) {
+ SkTextBlobBuilder builder;
+ auto paragraphLength = kParagraphLength;
+ SkScalar y = 0;
+ while (paragraphLength - 45 > 0) {
+ auto currentLineLength = SkTMin(45, paragraphLength - 45);
+ this->createRandomLine(glyphs, currentLineLength);
+
+ sk_tool_utils::add_to_text_blob_w_len(&builder, (const char*) glyphs,
+ currentLineLength*4, paint, 0, y);
+ y += fMetrics.fDescent - fMetrics.fAscent + fMetrics.fLeading;
+ paragraphLength -= 45;
+ }
+ fBlobs.emplace_back(builder.make());
+ }
+
+ fIndex = 0;
+ }
+
+ // Construct a random kWordLength character 'word' drawing from the full Chinese set
+ void createRandomLine(SkUnichar glyphs[45], int lineLength) {
+ for (auto i = 0; i < lineLength; ++i) {
+ glyphs[i] = fRand.nextRangeU(0x4F00, 0x9FA0);
+ }
+ }
+
+ bool fInitialized = false;
+ sk_sp<SkTypeface> fTypeface;
+ SkPaint::FontMetrics fMetrics;
+ SkTArray<sk_sp<SkTextBlob>> fBlobs;
+ SkRandom fRand;
+ SkScalar fScale;
+ int fIndex;
+
+ typedef SkView INHERITED;
+};
+
//////////////////////////////////////////////////////////////////////////////
-static SkView* MyFactory() { return new ChineseFlingView; }
-static SkViewRegister reg(MyFactory);
+static SkView* FlingFactory() { return new ChineseFlingView; }
+static SkViewRegister regFling(FlingFactory);
+
+static SkView* ZoomFactory() { return new ChineseZoomView; }
+static SkViewRegister regZoom(ZoomFactory);