2014-06-23 13:59:15 +00:00
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/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkCanvas.h"
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2018-12-16 20:57:29 +00:00
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#include "SkFont.h"
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2014-06-23 13:59:15 +00:00
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#include "SkTypeface.h"
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2019-03-20 16:12:10 +00:00
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#include "ToolUtils.h"
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#include "gm.h"
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2014-06-23 13:59:15 +00:00
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/* This test tries to define the effect of using hairline strokes on text.
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* Provides non-hairline images for reference and consistency checks.
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* glyph_pos_(h/n)_(s/f/b)
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* -> test hairline/non-hairline stroke/fill/stroke+fill.
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*/
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2016-09-01 18:24:54 +00:00
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constexpr SkScalar kTextHeight = 14.0f;
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constexpr char kText[] = "Proportional Hamburgefons #% fi";
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2014-06-23 13:59:15 +00:00
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2015-09-09 15:16:41 +00:00
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static void drawTestCase(SkCanvas* canvas,
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SkScalar textScale,
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SkScalar strokeWidth,
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SkPaint::Style strokeStyle);
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static void draw_gm(SkCanvas* canvas,
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SkScalar strokeWidth,
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SkPaint::Style strokeStyle) {
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2018-02-08 21:14:48 +00:00
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// There's a black pixel at 40, 40 for reference.
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2017-02-22 18:21:42 +00:00
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canvas->drawPoint(40, 40, SkPaint());
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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// Two reference images.
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canvas->translate(50.0f, 50.0f);
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drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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canvas->translate(0.0f, 50.0f);
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drawTestCase(canvas, 3.0f, strokeWidth, strokeStyle);
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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// Uniform scaling test.
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canvas->translate(0.0f, 100.0f);
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canvas->save();
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canvas->scale(3.0f, 3.0f);
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drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
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canvas->restore();
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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// Non-uniform scaling test.
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canvas->translate(0.0f, 100.0f);
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canvas->save();
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canvas->scale(3.0f, 6.0f);
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drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
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canvas->restore();
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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// Skew test.
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canvas->translate(0.0f, 80.0f);
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canvas->save();
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canvas->scale(3.0f, 3.0f);
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SkMatrix skew;
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skew.setIdentity();
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skew.setSkewX(8.0f / 25.0f);
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skew.setSkewY(2.0f / 25.0f);
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canvas->concat(skew);
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drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
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canvas->restore();
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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// Perspective test.
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canvas->translate(0.0f, 80.0f);
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canvas->save();
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SkMatrix perspective;
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perspective.setIdentity();
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perspective.setPerspX(-SkScalarInvert(340));
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perspective.setSkewX(8.0f / 25.0f);
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perspective.setSkewY(2.0f / 25.0f);
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2014-06-23 13:59:15 +00:00
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2017-02-22 18:21:42 +00:00
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canvas->concat(perspective);
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drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
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canvas->restore();
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2015-09-09 15:16:41 +00:00
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}
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2014-06-23 13:59:15 +00:00
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2015-09-09 15:16:41 +00:00
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static void drawTestCase(SkCanvas* canvas,
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SkScalar textScale,
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SkScalar strokeWidth,
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SkPaint::Style strokeStyle) {
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2018-12-16 20:57:29 +00:00
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SkPaint paint;
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paint.setColor(SK_ColorBLACK);
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paint.setAntiAlias(true);
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paint.setStrokeWidth(strokeWidth);
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paint.setStyle(strokeStyle);
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2019-03-20 16:12:10 +00:00
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SkFont font(ToolUtils::create_portable_typeface(), kTextHeight * textScale);
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2018-12-16 20:57:29 +00:00
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// This demonstrates that we can not measure the text if
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// there's a device transform. The canvas total matrix will
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// end up being a device transform.
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bool drawRef = !(canvas->getTotalMatrix().getType() &
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~(SkMatrix::kIdentity_Mask | SkMatrix::kTranslate_Mask));
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SkRect bounds;
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if (drawRef) {
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SkScalar advance = font.measureText(kText, sizeof(kText) - 1, kUTF8_SkTextEncoding,
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&bounds, &paint);
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paint.setStrokeWidth(0.0f);
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paint.setStyle(SkPaint::kStroke_Style);
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// Green box is the measured text bounds.
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paint.setColor(SK_ColorGREEN);
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canvas->drawRect(bounds, paint);
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// Red line is the measured advance from the 0,0 of the text position.
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paint.setColor(SK_ColorRED);
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canvas->drawLine(0.0f, 0.0f, advance, 0.0f, paint);
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}
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// Black text is the testcase, eg. the text.
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paint.setColor(SK_ColorBLACK);
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paint.setStrokeWidth(strokeWidth);
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paint.setStyle(strokeStyle);
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canvas->drawSimpleText(kText, sizeof(kText) - 1, kUTF8_SkTextEncoding, 0.0f, 0.0f, font, paint);
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if (drawRef) {
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const size_t len = sizeof(kText) - 1;
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SkGlyphID glyphs[len];
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const int count = font.textToGlyphs(kText, len, kUTF8_SkTextEncoding, glyphs, len);
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SkScalar widths[len]; // len is conservative. we really only need 'count'
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font.getWidthsBounds(glyphs, count, widths, nullptr, &paint);
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paint.setStrokeWidth(0.0f);
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paint.setStyle(SkPaint::kStroke_Style);
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// Magenta lines are the positions for the characters.
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paint.setColor(SK_ColorMAGENTA);
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SkScalar w = bounds.x();
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for (size_t i = 0; i < sizeof(kText) - 1; ++i) {
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canvas->drawLine(w, 0.0f, w, 5.0f, paint);
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w += widths[i];
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2014-06-23 13:59:15 +00:00
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}
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2018-12-16 20:57:29 +00:00
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}
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_h_b, c, 800, 600) {
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draw_gm(c, 0.0f, SkPaint::kStrokeAndFill_Style);
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_n_b, c, 800, 600) {
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draw_gm(c, 1.2f, SkPaint::kStrokeAndFill_Style);
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_h_s, c, 800, 600) {
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draw_gm(c, 0.0f, SkPaint::kStroke_Style);
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_n_s, c, 800, 600) {
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draw_gm(c, 1.2f, SkPaint::kStroke_Style);
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_h_f, c, 800, 600) {
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draw_gm(c, 0.0f, SkPaint::kFill_Style);
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2014-06-23 13:59:15 +00:00
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}
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2015-09-09 15:16:41 +00:00
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DEF_SIMPLE_GM(glyph_pos_n_f, c, 800, 600) {
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draw_gm(c, 1.2f, SkPaint::kFill_Style);
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2014-06-23 13:59:15 +00:00
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}
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