| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm.h" |
| #include "SkCanvas.h" |
| #include "SkGradientShader.h" |
| |
| /** |
| * This test exercises drawPosTextH and drawPosText with every text align. |
| */ |
| static const int kWidth = 480; |
| static const int kHeight = 600; |
| static const SkScalar kTextHeight = 64.0f; |
| static const int kMaxStringLength = 12; |
| |
| namespace skiagm { |
| |
| class GlyphPosAlignGM : public GM { |
| protected: |
| |
| SkString onShortName() override { |
| return SkString("glyph_pos_align"); |
| } |
| |
| SkISize onISize() override { return SkISize::Make(kWidth, kHeight); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| canvas->clear(SK_ColorBLACK); |
| |
| SkPaint paint; |
| paint.setTextSize(kTextHeight); |
| paint.setFakeBoldText(true); |
| const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE }; |
| const SkPoint pts[] = {{0, 0}, {kWidth, kHeight}}; |
| SkAutoTUnref<SkShader> grad(SkGradientShader::CreateLinear(pts, colors, NULL, |
| SK_ARRAY_COUNT(colors), |
| SkShader::kMirror_TileMode)); |
| paint.setShader(grad); |
| |
| |
| paint.setTextAlign(SkPaint::kRight_Align); |
| drawTestCase(canvas, "Right Align", kTextHeight, paint); |
| |
| paint.setTextAlign(SkPaint::kCenter_Align); |
| drawTestCase(canvas, "Center Align", 4 * kTextHeight, paint); |
| |
| paint.setTextAlign(SkPaint::kLeft_Align); |
| drawTestCase(canvas, "Left Align", 7 * kTextHeight, paint); |
| } |
| |
| void drawTestCase(SkCanvas* canvas, const char* text, SkScalar y, const SkPaint& paint) { |
| SkScalar widths[kMaxStringLength]; |
| SkScalar posX[kMaxStringLength]; |
| SkPoint pos[kMaxStringLength]; |
| int length = SkToInt(strlen(text)); |
| SkASSERT(length <= kMaxStringLength); |
| |
| paint.getTextWidths(text, length, widths); |
| |
| float originX; |
| switch (paint.getTextAlign()) { |
| case SkPaint::kRight_Align: originX = 1; break; |
| case SkPaint::kCenter_Align: originX = 0.5f; break; |
| case SkPaint::kLeft_Align: originX = 0; break; |
| default: SkFAIL("Invalid paint origin"); return; |
| } |
| |
| float x = kTextHeight; |
| for (int i = 0; i < length; ++i) { |
| posX[i] = x + originX * widths[i]; |
| pos[i].set(posX[i], i ? pos[i - 1].y() + 3 : y + kTextHeight); |
| x += widths[i]; |
| } |
| |
| canvas->drawPosTextH(text, length, posX, y, paint); |
| canvas->drawPosText(text, length, pos, paint); |
| } |
| |
| private: |
| |
| typedef GM INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static GM* GlyphPosAlignFactory(void*) { |
| return new GlyphPosAlignGM(); |
| } |
| |
| static GMRegistry reg(GlyphPosAlignFactory); |
| |
| } |