skia2/gm/all_bitmap_configs.cpp

194 lines
6.3 KiB
C++

/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "sk_tool_utils.h"
#include "SkSurface.h"
#include "Resources.h"
#include "gm.h"
#include "SkMath.h"
#include "SkColorPriv.h"
static SkBitmap copy_bitmap(const SkBitmap& src, SkColorType colorType) {
SkBitmap copy;
src.copyTo(&copy, colorType);
copy.setImmutable();
return copy;
}
#define SCALE 128
// Make either A8 or gray8 bitmap.
static SkBitmap make_bitmap(SkColorType ct) {
SkBitmap bm;
switch (ct) {
case kAlpha_8_SkColorType:
bm.allocPixels(SkImageInfo::MakeA8(SCALE, SCALE));
break;
case kGray_8_SkColorType:
bm.allocPixels(
SkImageInfo::Make(SCALE, SCALE, ct, kOpaque_SkAlphaType));
break;
default:
SkASSERT(false);
return bm;
}
SkAutoLockPixels autoLockPixels(bm);
uint8_t spectrum[256];
for (int y = 0; y < 256; ++y) {
spectrum[y] = y;
}
for (int y = 0; y < 128; ++y) {
// Shift over one byte each scanline.
memcpy(bm.getAddr8(0, y), &spectrum[y], 128);
}
bm.setImmutable();
return bm;
}
static void draw_center_letter(char c,
SkPaint* p,
SkColor color,
SkScalar x,
SkScalar y,
SkCanvas* canvas) {
SkRect bounds;
p->setColor(color);
p->measureText(&c, 1, &bounds);
canvas->drawText(&c, 1, x - bounds.centerX(), y - bounds.centerY(), *p);
}
static void color_wheel_native(SkCanvas* canvas) {
SkAutoCanvasRestore autoCanvasRestore(canvas, true);
canvas->translate(0.5f * SCALE, 0.5f * SCALE);
SkPaint p;
p.setAntiAlias(false);
p.setColor(SK_ColorWHITE);
canvas->drawCircle(0.0f, 0.0f, SCALE * 0.5f, p);
const double sqrt_3_over_2 = 0.8660254037844387;
const SkScalar Z = 0.0f;
const SkScalar D = 0.3f * SkIntToScalar(SCALE);
const SkScalar X = SkDoubleToScalar(D * sqrt_3_over_2);
const SkScalar Y = D * SK_ScalarHalf;
sk_tool_utils::set_portable_typeface_always(&p, NULL, SkTypeface::kBold);
p.setTextSize(0.28125f * SCALE);
draw_center_letter('K', &p, SK_ColorBLACK, Z, Z, canvas);
draw_center_letter('R', &p, SK_ColorRED, Z, D, canvas);
draw_center_letter('G', &p, SK_ColorGREEN, -X, -Y, canvas);
draw_center_letter('B', &p, SK_ColorBLUE, X, -Y, canvas);
draw_center_letter('C', &p, SK_ColorCYAN, Z, -D, canvas);
draw_center_letter('M', &p, SK_ColorMAGENTA, X, Y, canvas);
draw_center_letter('Y', &p, SK_ColorYELLOW, -X, Y, canvas);
}
template <typename T>
int find(T* array, int N, T item) {
for (int i = 0; i < N; ++i) {
if (array[i] == item) {
return i;
}
}
return -1;
}
static SkPMColor premultiply_color(SkColor c) {
return SkPremultiplyARGBInline(SkColorGetA(c), SkColorGetR(c),
SkColorGetG(c), SkColorGetB(c));
}
static SkBitmap indexed_bitmap() {
SkBitmap n32bitmap;
n32bitmap.allocN32Pixels(SCALE, SCALE);
n32bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(n32bitmap);
color_wheel_native(&canvas);
const SkColor colors[] = {
SK_ColorTRANSPARENT,
SK_ColorWHITE,
SK_ColorBLACK,
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorCYAN,
SK_ColorMAGENTA,
SK_ColorYELLOW,
};
SkPMColor pmColors[SK_ARRAY_COUNT(colors)];
for (size_t i = 0; i < SK_ARRAY_COUNT(colors); ++i) {
pmColors[i] = premultiply_color(colors[i]);
}
SkBitmap bm;
SkAutoTUnref<SkColorTable> ctable(
SkNEW_ARGS(SkColorTable, (pmColors, SK_ARRAY_COUNT(pmColors))));
SkImageInfo info = SkImageInfo::Make(SCALE, SCALE, kIndex_8_SkColorType,
kPremul_SkAlphaType);
bm.allocPixels(info, NULL, ctable);
SkAutoLockPixels autoLockPixels1(n32bitmap);
SkAutoLockPixels autoLockPixels2(bm);
for (int y = 0; y < SCALE; ++y) {
for (int x = 0; x < SCALE; ++x) {
SkPMColor c = *n32bitmap.getAddr32(x, y);
int idx = find(pmColors, SK_ARRAY_COUNT(pmColors), c);
*bm.getAddr8(x, y) = SkClampMax(idx, SK_ARRAY_COUNT(pmColors) - 1);
}
}
return bm;
}
static void draw(SkCanvas* canvas,
const SkPaint& p,
const SkBitmap& src,
SkColorType colorType,
const char text[]) {
SkASSERT(src.colorType() == colorType);
canvas->drawBitmap(src, 0.0f, 0.0f);
canvas->drawText(text, strlen(text), 0.0f, 12.0f, p);
}
DEF_SIMPLE_GM(all_bitmap_configs, canvas, SCALE, 6 * SCALE) {
SkAutoCanvasRestore autoCanvasRestore(canvas, true);
SkPaint p;
p.setColor(SK_ColorBLACK);
p.setAntiAlias(true);
sk_tool_utils::set_portable_typeface_always(&p, NULL);
sk_tool_utils::draw_checkerboard(canvas, SK_ColorLTGRAY, SK_ColorWHITE, 8);
SkBitmap bitmap;
if (GetResourceAsBitmap("color_wheel.png", &bitmap)) {
bitmap.setImmutable();
draw(canvas, p, bitmap, kN32_SkColorType, "Native 32");
canvas->translate(0.0f, SkIntToScalar(SCALE));
SkBitmap copy565 = copy_bitmap(bitmap, kRGB_565_SkColorType);
p.setColor(SK_ColorRED);
draw(canvas, p, copy565, kRGB_565_SkColorType, "RGB 565");
p.setColor(SK_ColorBLACK);
canvas->translate(0.0f, SkIntToScalar(SCALE));
SkBitmap copy4444 = copy_bitmap(bitmap, kARGB_4444_SkColorType);
draw(canvas, p, copy4444, kARGB_4444_SkColorType, "ARGB 4444");
} else {
canvas->translate(0.0f, SkIntToScalar(2 * SCALE));
}
canvas->translate(0.0f, SkIntToScalar(SCALE));
SkBitmap bitmapIndexed = indexed_bitmap();
draw(canvas, p, bitmapIndexed, kIndex_8_SkColorType, "Index 8");
canvas->translate(0.0f, SkIntToScalar(SCALE));
SkBitmap bitmapA8 = make_bitmap(kAlpha_8_SkColorType);
draw(canvas, p, bitmapA8, kAlpha_8_SkColorType, "Alpha 8");
p.setColor(SK_ColorRED);
canvas->translate(0.0f, SkIntToScalar(SCALE));
SkBitmap bitmapG8 = make_bitmap(kGray_8_SkColorType);
draw(canvas, p, bitmapG8, kGray_8_SkColorType, "Gray 8");
}