0fb10ab912
This makes part of of our testing infrastructure (i.e., the GMs) compatible with Graphite's more stringent requirements. Bug: skia:12701 Change-Id: I5e42d93050eccc1e455f46e07b64654ad3d4548c Reviewed-on: https://skia-review.googlesource.com/c/skia/+/531997 Reviewed-by: Jim Van Verth <jvanverth@google.com> Commit-Queue: Robert Phillips <robertphillips@google.com>
95 lines
4.2 KiB
C++
95 lines
4.2 KiB
C++
/*
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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 "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontStyle.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "tools/Resources.h"
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#include "tools/ToolUtils.h"
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static void draw_image(SkCanvas* canvas, const char* resource, int x, int y) {
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sk_sp<SkImage> image(GetResourceAsImage(resource));
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if (image) {
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canvas->drawImage(image, SkIntToScalar(x), SkIntToScalar(y));
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} else {
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SkDebugf("\nCould not decode file '%s'. Did you forget"
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" to set the resourcePath?\n", resource);
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}
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}
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/*
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This GM tests whether the image decoders properly decode each color
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channel. Four copies of the same image should appear in the GM, and
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the letter R should be red, B should be blue, G green, C cyan, M
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magenta, Y yellow, and K black. In all but the JPEG version of the
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image, the letters should be on a white disc on a transparent
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background (rendered as a checkerboard). The JPEG image has a grey
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background and compression artifacts.
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*/
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DEF_SIMPLE_GM(colorwheel, canvas, 256, 256) {
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ToolUtils::draw_checkerboard(canvas);
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draw_image(canvas, "images/color_wheel.png", 0, 0); // top left
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draw_image(canvas, "images/color_wheel.gif", 128, 0); // top right
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draw_image(canvas, "images/color_wheel.webp", 0, 128); // bottom left
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draw_image(canvas, "images/color_wheel.jpg", 128, 128); // bottom right
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}
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DEF_SIMPLE_GM(colorwheelnative, canvas, 128, 28) {
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SkFont font(ToolUtils::create_portable_typeface("sans-serif", SkFontStyle::Bold()), 18);
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font.setEdging(SkFont::Edging::kAlias);
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canvas->clear(SK_ColorLTGRAY);
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canvas->drawString("R", 8.0f, 20.0f, font, SkPaint(SkColors::kRed));
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canvas->drawString("G", 24.0f, 20.0f, font, SkPaint(SkColors::kGreen));
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canvas->drawString("B", 40.0f, 20.0f, font, SkPaint(SkColors::kBlue));
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canvas->drawString("C", 56.0f, 20.0f, font, SkPaint(SkColors::kCyan));
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canvas->drawString("M", 72.0f, 20.0f, font, SkPaint(SkColors::kMagenta));
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canvas->drawString("Y", 88.0f, 20.0f, font, SkPaint(SkColors::kYellow));
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canvas->drawString("K", 104.0f, 20.0f, font, SkPaint(SkColors::kBlack));
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}
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/**
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* This GM tests decoding images with non-default (overridden) alpha types.
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*/
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DEF_SIMPLE_GM(colorwheel_alphatypes, canvas, 256, 128) {
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canvas->clear(SK_ColorWHITE);
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sk_sp<SkData> imgData = GetResourceAsData("images/color_wheel.png");
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auto pmImg = ToolUtils::MakeTextureImage(canvas,
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SkImage::MakeFromEncoded(imgData,
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kPremul_SkAlphaType));
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auto upmImg = ToolUtils::MakeTextureImage(canvas,
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SkImage::MakeFromEncoded(imgData,
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kUnpremul_SkAlphaType));
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SkSamplingOptions linear{SkFilterMode::kLinear};
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// We draw a tiny (8x8) section of the image that falls right on the edge of transparency,
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// and blow it up so we can really see the impact of filtering in premul or unpremul.
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SkRect srcRect = SkRect::MakeXYWH(12, 102, 8, 8);
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SkRect dstRect = SkRect::MakeLTRB(0, 0, 128, 128);
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// First, we draw the normal (premul-then-filter) image, which looks good. The yellow image
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// transitions to the white background like you'd expect.
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canvas->drawImageRect(pmImg, srcRect, dstRect,
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linear, nullptr, SkCanvas::kFast_SrcRectConstraint);
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// Next, we draw the unpremul (filter-then-premul) image, which looks bad. Filtering in unpremul
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// causes the implicit black of the transparent pixels to be bleed into the filtered edge,
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// creating a dark "fringe" at the boundary between the yellow image and white background.
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canvas->drawImageRect(upmImg, srcRect, dstRect.makeOffset(128, 0),
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linear, nullptr, SkCanvas::kFast_SrcRectConstraint);
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}
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