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- /*
- * 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/gm.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkFontTypes.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkTypeface.h"
- #include "include/core/SkTypes.h"
- #include "tools/ToolUtils.h"
- /* This test tries to define the effect of using hairline strokes on text.
- * Provides non-hairline images for reference and consistency checks.
- * glyph_pos_(h/n)_(s/f/b)
- * -> test hairline/non-hairline stroke/fill/stroke+fill.
- */
- constexpr SkScalar kTextHeight = 14.0f;
- constexpr char kText[] = "Proportional Hamburgefons #% fi";
- static void drawTestCase(SkCanvas* canvas,
- SkScalar textScale,
- SkScalar strokeWidth,
- SkPaint::Style strokeStyle);
- static void draw_gm(SkCanvas* canvas,
- SkScalar strokeWidth,
- SkPaint::Style strokeStyle) {
- // There's a black pixel at 40, 40 for reference.
- canvas->drawPoint(40, 40, SkPaint());
- // Two reference images.
- canvas->translate(50.0f, 50.0f);
- drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
- canvas->translate(0.0f, 50.0f);
- drawTestCase(canvas, 3.0f, strokeWidth, strokeStyle);
- // Uniform scaling test.
- canvas->translate(0.0f, 100.0f);
- canvas->save();
- canvas->scale(3.0f, 3.0f);
- drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
- canvas->restore();
- // Non-uniform scaling test.
- canvas->translate(0.0f, 100.0f);
- canvas->save();
- canvas->scale(3.0f, 6.0f);
- drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
- canvas->restore();
- // Skew test.
- canvas->translate(0.0f, 80.0f);
- canvas->save();
- canvas->scale(3.0f, 3.0f);
- SkMatrix skew;
- skew.setIdentity();
- skew.setSkewX(8.0f / 25.0f);
- skew.setSkewY(2.0f / 25.0f);
- canvas->concat(skew);
- drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
- canvas->restore();
- // Perspective test.
- canvas->translate(0.0f, 80.0f);
- canvas->save();
- SkMatrix perspective;
- perspective.setIdentity();
- perspective.setPerspX(-SkScalarInvert(340));
- perspective.setSkewX(8.0f / 25.0f);
- perspective.setSkewY(2.0f / 25.0f);
- canvas->concat(perspective);
- drawTestCase(canvas, 1.0f, strokeWidth, strokeStyle);
- canvas->restore();
- }
- static void drawTestCase(SkCanvas* canvas,
- SkScalar textScale,
- SkScalar strokeWidth,
- SkPaint::Style strokeStyle) {
- SkPaint paint;
- paint.setColor(SK_ColorBLACK);
- paint.setAntiAlias(true);
- paint.setStrokeWidth(strokeWidth);
- paint.setStyle(strokeStyle);
- SkFont font(ToolUtils::create_portable_typeface(), kTextHeight * textScale);
- // This demonstrates that we can not measure the text if
- // there's a device transform. The canvas total matrix will
- // end up being a device transform.
- bool drawRef = !(canvas->getTotalMatrix().getType() &
- ~(SkMatrix::kIdentity_Mask | SkMatrix::kTranslate_Mask));
- SkRect bounds;
- if (drawRef) {
- SkScalar advance = font.measureText(kText, sizeof(kText) - 1, SkTextEncoding::kUTF8,
- &bounds, &paint);
- paint.setStrokeWidth(0.0f);
- paint.setStyle(SkPaint::kStroke_Style);
- // Green box is the measured text bounds.
- paint.setColor(SK_ColorGREEN);
- canvas->drawRect(bounds, paint);
- // Red line is the measured advance from the 0,0 of the text position.
- paint.setColor(SK_ColorRED);
- canvas->drawLine(0.0f, 0.0f, advance, 0.0f, paint);
- }
- // Black text is the testcase, eg. the text.
- paint.setColor(SK_ColorBLACK);
- paint.setStrokeWidth(strokeWidth);
- paint.setStyle(strokeStyle);
- canvas->drawSimpleText(kText, sizeof(kText) - 1, SkTextEncoding::kUTF8,
- 0.0f, 0.0f, font, paint);
- if (drawRef) {
- const size_t len = sizeof(kText) - 1;
- SkGlyphID glyphs[len];
- const int count = font.textToGlyphs(kText, len, SkTextEncoding::kUTF8, glyphs, len);
- SkScalar widths[len]; // len is conservative. we really only need 'count'
- font.getWidthsBounds(glyphs, count, widths, nullptr, &paint);
- paint.setStrokeWidth(0.0f);
- paint.setStyle(SkPaint::kStroke_Style);
- // Magenta lines are the positions for the characters.
- paint.setColor(SK_ColorMAGENTA);
- SkScalar w = bounds.x();
- for (size_t i = 0; i < sizeof(kText) - 1; ++i) {
- canvas->drawLine(w, 0.0f, w, 5.0f, paint);
- w += widths[i];
- }
- }
- }
- DEF_SIMPLE_GM(glyph_pos_h_b, c, 800, 600) {
- draw_gm(c, 0.0f, SkPaint::kStrokeAndFill_Style);
- }
- DEF_SIMPLE_GM(glyph_pos_n_b, c, 800, 600) {
- draw_gm(c, 1.2f, SkPaint::kStrokeAndFill_Style);
- }
- DEF_SIMPLE_GM(glyph_pos_h_s, c, 800, 600) {
- draw_gm(c, 0.0f, SkPaint::kStroke_Style);
- }
- DEF_SIMPLE_GM(glyph_pos_n_s, c, 800, 600) {
- draw_gm(c, 1.2f, SkPaint::kStroke_Style);
- }
- DEF_SIMPLE_GM(glyph_pos_h_f, c, 800, 600) {
- draw_gm(c, 0.0f, SkPaint::kFill_Style);
- }
- DEF_SIMPLE_GM(glyph_pos_n_f, c, 800, 600) {
- draw_gm(c, 1.2f, SkPaint::kFill_Style);
- }
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