зеркало из https://github.com/mozilla/moz-skia.git
252 строки
8.8 KiB
C++
252 строки
8.8 KiB
C++
#include "gm.h"
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#include "SkBitmap.h"
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#include "SkShader.h"
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#include "SkXfermode.h"
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namespace skiagm {
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static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
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src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
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src->allocPixels();
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src->eraseColor(0);
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SkCanvas c(*src);
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SkPaint p;
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SkRect r;
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SkScalar ww = SkIntToScalar(w);
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SkScalar hh = SkIntToScalar(h);
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p.setAntiAlias(true);
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p.setColor(0xFFFFCC44);
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r.set(0, 0, ww*3/4, hh*3/4);
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c.drawOval(r, p);
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dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
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dst->allocPixels();
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dst->eraseColor(0);
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c.setBitmapDevice(*dst);
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p.setColor(0xFF66AAFF);
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r.set(ww/3, hh/3, ww*19/20, hh*19/20);
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c.drawRect(r, p);
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}
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static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
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class XfermodesGM : public GM {
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SkBitmap fBG;
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SkBitmap fSrcB, fDstB;
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/* The sourceType argument indicates what to draw for the source part. Skia
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* uses the implied shape of the drawing command and these modes
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* demonstrate that.
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*
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* 0x01: A WxH image with a rectangle in the lower right.
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* 0x02: Same as 0x01, but with an alpha of 34.5%.
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* 0x04: Same as 0x02, but scaled down by half.
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* 0x08: The same rectangle as 0x01, but drawn directly instead in an image.
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* 0x10: Two rectangles, first on the right half, second on the bottom half.
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* 0x20: Same as 0x10, but on a layer.
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*/
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void draw_mode(SkCanvas* canvas, SkXfermode* mode, int sourceType,
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SkScalar x, SkScalar y) {
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SkPaint p;
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SkMatrix m;
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bool restoreNeeded = false;
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m.setTranslate(x, y);
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canvas->drawBitmapMatrix(fSrcB, m, &p);
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p.setXfermode(mode);
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switch (sourceType) {
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case 0x20: {
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SkRect bounds = SkRect::MakeXYWH(x, y, W, H);
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canvas->saveLayer(&bounds, &p);
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restoreNeeded = true;
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p.setXfermodeMode(SkXfermode::kSrcOver_Mode);
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// Fall through.
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}
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case 0x10: {
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SkScalar halfW = SkIntToScalar(W) / 2;
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SkScalar halfH = SkIntToScalar(H) / 2;
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p.setColor(0xFF66AAFF);
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SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, H);
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canvas->drawRect(r, p);
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p.setColor(0xFFAA66FF);
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r = SkRect::MakeXYWH(x, y + halfH, W, halfH);
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canvas->drawRect(r, p);
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break;
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}
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case 0x8: {
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SkScalar w = SkIntToScalar(W);
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SkScalar h = SkIntToScalar(H);
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SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
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w * 37 / 60, h * 37 / 60);
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p.setColor(0xFF66AAFF);
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canvas->drawRect(r, p);
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break;
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}
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case 0x4:
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m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
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// Fall through.
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case 0x2:
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p.setAlpha(0x88);
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// Fall through.
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case 0x1:
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canvas->drawBitmapMatrix(fDstB, m, &p);
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break;
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default:
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break;
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}
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if (restoreNeeded) {
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canvas->restore();
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}
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}
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public:
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const static int W = 64;
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const static int H = 64;
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XfermodesGM() {
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// Do all this work in a temporary so we get a deep copy,
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// especially of gBG.
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SkBitmap scratchBitmap;
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scratchBitmap.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
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scratchBitmap.setPixels(gBG);
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scratchBitmap.setIsOpaque(true);
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scratchBitmap.copyTo(&fBG, SkBitmap::kARGB_4444_Config);
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make_bitmaps(W, H, &fSrcB, &fDstB);
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}
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protected:
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virtual SkString onShortName() {
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return SkString("xfermodes");
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}
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virtual SkISize onISize() {
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return make_isize(1590, 640);
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}
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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(SK_ColorWHITE);
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}
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virtual void onDraw(SkCanvas* canvas) {
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canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
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this->drawBG(canvas);
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const int kMaxSourceType = 0x20;
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const struct {
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SkXfermode::Mode fMode;
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const char* fLabel;
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int fSourceTypeMask; // The source types to use this
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// mode with. See draw_mode for
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// an explanation of each type.
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// PDF has to play some tricks
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// to support the base modes,
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// test those more extensively.
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} gModes[] = {
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{ SkXfermode::kClear_Mode, "Clear", 0x3F },
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{ SkXfermode::kSrc_Mode, "Src", 0x3F },
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{ SkXfermode::kDst_Mode, "Dst", 0x3F },
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{ SkXfermode::kSrcOver_Mode, "SrcOver", 0x3F },
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{ SkXfermode::kDstOver_Mode, "DstOver", 0x3F },
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{ SkXfermode::kSrcIn_Mode, "SrcIn", 0x3F },
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{ SkXfermode::kDstIn_Mode, "DstIn", 0x3F },
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{ SkXfermode::kSrcOut_Mode, "SrcOut", 0x3F },
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{ SkXfermode::kDstOut_Mode, "DstOut", 0x3F },
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{ SkXfermode::kSrcATop_Mode, "SrcATop", 0x3F },
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{ SkXfermode::kDstATop_Mode, "DstATop", 0x3F },
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{ SkXfermode::kXor_Mode, "Xor", 0x03 },
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{ SkXfermode::kPlus_Mode, "Plus", 0x03 },
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{ SkXfermode::kMultiply_Mode, "Multiply", 0x3F },
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{ SkXfermode::kScreen_Mode, "Screen", 0x03 },
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{ SkXfermode::kOverlay_Mode, "Overlay", 0x03 },
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{ SkXfermode::kDarken_Mode, "Darken", 0x03 },
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{ SkXfermode::kLighten_Mode, "Lighten", 0x03 },
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{ SkXfermode::kColorDodge_Mode, "ColorDodge", 0x03 },
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{ SkXfermode::kColorBurn_Mode, "ColorBurn", 0x03 },
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{ SkXfermode::kHardLight_Mode, "HardLight", 0x03 },
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{ SkXfermode::kSoftLight_Mode, "SoftLight", 0x03 },
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{ SkXfermode::kDifference_Mode, "Difference", 0x03 },
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{ SkXfermode::kExclusion_Mode, "Exclusion", 0x03 },
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};
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const SkScalar w = SkIntToScalar(W);
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const SkScalar h = SkIntToScalar(H);
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SkShader* s = SkShader::CreateBitmapShader(fBG,
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SkShader::kRepeat_TileMode,
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SkShader::kRepeat_TileMode);
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SkMatrix m;
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m.setScale(SkIntToScalar(6), SkIntToScalar(6));
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s->setLocalMatrix(m);
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SkPaint labelP;
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labelP.setAntiAlias(true);
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labelP.setTextAlign(SkPaint::kCenter_Align);
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const int W = 5;
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SkScalar x0 = 0;
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SkScalar y0 = 0;
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for (int sourceType = 1; sourceType <= kMaxSourceType; sourceType *=2) {
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SkScalar x = x0, y = y0;
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for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
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if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
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continue;
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}
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SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
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SkAutoUnref aur(mode);
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SkRect r;
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r.set(x, y, x+w, y+h);
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SkPaint p;
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p.setStyle(SkPaint::kFill_Style);
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p.setShader(s);
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canvas->drawRect(r, p);
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canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
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draw_mode(canvas, mode, sourceType, r.fLeft, r.fTop);
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canvas->restore();
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r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
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p.setStyle(SkPaint::kStroke_Style);
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p.setShader(NULL);
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canvas->drawRect(r, p);
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#if 1
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canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
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x + w/2, y - labelP.getTextSize()/2, labelP);
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#endif
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x += w + SkIntToScalar(10);
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if ((i % W) == W - 1) {
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x = x0;
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y += h + SkIntToScalar(30);
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}
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}
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if (y < 320) {
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if (x > x0) {
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y += h + SkIntToScalar(30);
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}
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y0 = y;
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} else {
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x0 += SkIntToScalar(400);
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y0 = 0;
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}
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}
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s->unref();
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}
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private:
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new XfermodesGM; }
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static GMRegistry reg(MyFactory);
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}
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