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author | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-08-14 22:02:23 +0000 |
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committer | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-08-14 22:02:23 +0000 |
commit | 5d18cee176b8a8c01138a43fd561881090ebc810 (patch) | |
tree | 6369854951d0db95bf126d6441b661e3a8c5317b /gm/bitmappremul.cpp | |
parent | ab882bf205affcd29f62f764681bfdf09fde004e (diff) |
Unpremultiply SkBitmaps for PDF output
BUG=skia:236, chromium:175548
R=vandebo@chromium.org, edisonn@google.com, reed@google.com
Author: richardlin@chromium.org
Review URL: https://chromiumcodereview.appspot.com/22329003
git-svn-id: http://skia.googlecode.com/svn/trunk@10725 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'gm/bitmappremul.cpp')
-rw-r--r-- | gm/bitmappremul.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/gm/bitmappremul.cpp b/gm/bitmappremul.cpp new file mode 100644 index 0000000000..9f0c1e8cb9 --- /dev/null +++ b/gm/bitmappremul.cpp @@ -0,0 +1,131 @@ +/* + * Copyright 2013 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 "SkBitmap.h" +#include "SkCanvas.h" +#include "SkColorPriv.h" + +/** + * This GM checks that bitmap pixels are unpremultiplied before being exported + * to other formats. If unpremultiplication is implemented properly, this + * GM should come out completely white. If not, this GM looks like a row of two + * greyscale gradients above a row of grey lines. + * This tests both the ARGB4444 and ARGB8888 bitmap configurations. + */ + +static const int SLIDE_SIZE = 256; +static const int PIXEL_SIZE_8888 = SLIDE_SIZE / 256; +static const int PIXEL_SIZE_4444 = SLIDE_SIZE / 16; + +static SkBitmap init_bitmap(SkBitmap::Config config) { + SkBitmap bitmap; + bitmap.setConfig(config, SLIDE_SIZE, SLIDE_SIZE); + bitmap.allocPixels(); + bitmap.eraseColor(SK_ColorWHITE); + return bitmap; +} + +static SkBitmap make_argb8888_gradient() { + SkBitmap bitmap = init_bitmap(SkBitmap::kARGB_8888_Config); + uint8_t rowColor = 0; + for (int y = 0; y < SLIDE_SIZE; y++) { + uint32_t* dst = bitmap.getAddr32(0, y); + for (int x = 0; x < SLIDE_SIZE; x++) { + dst[x] = SkPackARGB32(rowColor, rowColor, + rowColor, rowColor); + } + if (y % PIXEL_SIZE_8888 == PIXEL_SIZE_8888 - 1) { + rowColor++; + } + } + return bitmap; +} + +static SkBitmap make_argb4444_gradient() { + SkBitmap bitmap = init_bitmap(SkBitmap::kARGB_4444_Config); + uint8_t rowColor = 0; + for (int y = 0; y < SLIDE_SIZE; y++) { + uint16_t* dst = bitmap.getAddr16(0, y); + for (int x = 0; x < SLIDE_SIZE; x++) { + dst[x] = SkPackARGB4444(rowColor, rowColor, + rowColor, rowColor); + } + if (y % PIXEL_SIZE_4444 == PIXEL_SIZE_4444 - 1) { + rowColor++; + } + } + return bitmap; +} + +static SkBitmap make_argb8888_stripes() { + SkBitmap bitmap = init_bitmap(SkBitmap::kARGB_8888_Config); + uint8_t rowColor = 0; + for (int y = 0; y < SLIDE_SIZE; y++) { + uint32_t* dst = bitmap.getAddr32(0, y); + for (int x = 0; x < SLIDE_SIZE; x++) { + dst[x] = SkPackARGB32(rowColor, rowColor, + rowColor, rowColor); + } + if (rowColor == 0) { + rowColor = 255; + } else { + rowColor = 0; + } + } + return bitmap; +} + +static SkBitmap make_argb4444_stripes() { + SkBitmap bitmap = init_bitmap(SkBitmap::kARGB_4444_Config); + uint8_t rowColor = 0;; + for (int y = 0; y < SLIDE_SIZE; y++) { + uint16_t* dst = bitmap.getAddr16(0, y); + for (int x = 0; x < SLIDE_SIZE; x++) { + dst[x] = SkPackARGB4444(rowColor, rowColor, + rowColor, rowColor); + } + if (rowColor == 0) { + rowColor = 15; + } else { + rowColor = 0; + } + } + return bitmap; +} + +namespace skiagm { + +class BitmapPremulGM : public GM { +public: + BitmapPremulGM() { + this->setBGColor(0xFFFFFFFF); + } + +protected: + SkString onShortName() SK_OVERRIDE { + return SkString("bitmap_premul"); + } + + virtual SkISize onISize() SK_OVERRIDE { + return SkISize::Make(512, 512); + } + + virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { + SkScalar slideSize = SLIDE_SIZE; + canvas->drawBitmap(make_argb8888_gradient(), 0, 0); + canvas->drawBitmap(make_argb4444_gradient(), slideSize, 0); + canvas->drawBitmap(make_argb8888_stripes(), 0, slideSize); + canvas->drawBitmap(make_argb4444_stripes(), slideSize, slideSize); + } + +private: + typedef GM INHERITED; +}; + +DEF_GM( return new BitmapPremulGM; ) +} |