| /* |
| * Copyright 2011 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/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkPixmap.h" |
| #include "include/core/SkRasterHandleAllocator.h" |
| #include "include/core/SkSurface.h" |
| |
| class GraphicsPort { |
| protected: |
| SkCanvas* fCanvas; |
| |
| public: |
| GraphicsPort(SkCanvas* canvas) : fCanvas(canvas) {} |
| virtual ~GraphicsPort() {} |
| |
| void save() { fCanvas->save(); } |
| void saveLayer(const SkRect& bounds, SkAlpha alpha) { |
| fCanvas->saveLayerAlpha(&bounds, alpha); |
| } |
| void restore() { fCanvas->restore(); } |
| |
| void translate(float x, float y) { fCanvas->translate(x, y); } |
| void scale(float s) { fCanvas->scale(s, s); } |
| void clip(const SkRect& r) { fCanvas->clipRect(r); } |
| |
| void drawOval(const SkRect& r, SkColor c) { |
| SkPaint p; |
| p.setColor(c); |
| fCanvas->drawOval(r, p); |
| } |
| |
| virtual void drawRect(const SkRect& r, SkColor c) { |
| SkPaint p; |
| p.setColor(c); |
| fCanvas->drawRect(r, p); |
| } |
| |
| SkCanvas* peekCanvas() const { return fCanvas; } |
| }; |
| |
| class SkiaGraphicsPort : public GraphicsPort { |
| public: |
| SkiaGraphicsPort(SkCanvas* canvas) : GraphicsPort(canvas) {} |
| |
| void drawRect(const SkRect& r, SkColor c) override { |
| SkCanvas* canvas = (SkCanvas*)fCanvas->accessTopRasterHandle(); |
| canvas->drawRect(r, SkPaint(SkColor4f::FromColor(c))); |
| } |
| }; |
| |
| class SkiaAllocator : public SkRasterHandleAllocator { |
| public: |
| SkiaAllocator() {} |
| |
| bool allocHandle(const SkImageInfo& info, Rec* rec) override { |
| sk_sp<SkSurface> surface = SkSurface::MakeRaster(info); |
| if (!surface) { |
| return false; |
| } |
| SkCanvas* canvas = surface->getCanvas(); |
| SkPixmap pixmap; |
| canvas->peekPixels(&pixmap); |
| |
| rec->fReleaseProc = [](void* pixels, void* ctx){ SkSafeUnref((SkSurface*)ctx); }; |
| rec->fReleaseCtx = surface.release(); |
| rec->fPixels = pixmap.writable_addr(); |
| rec->fRowBytes = pixmap.rowBytes(); |
| rec->fHandle = canvas; |
| canvas->save(); // balanced each time updateHandle is called |
| return true; |
| } |
| |
| void updateHandle(Handle hndl, const SkMatrix& ctm, const SkIRect& clip) override { |
| SkCanvas* canvas = (SkCanvas*)hndl; |
| canvas->restore(); |
| canvas->save(); |
| canvas->clipRect(SkRect::Make(clip)); |
| canvas->concat(ctm); |
| } |
| }; |
| |
| #ifdef SK_BUILD_FOR_MAC |
| |
| #include "include/utils/mac/SkCGUtils.h" |
| class CGGraphicsPort : public GraphicsPort { |
| public: |
| CGGraphicsPort(SkCanvas* canvas) : GraphicsPort(canvas) {} |
| |
| void drawRect(const SkRect& r, SkColor c) override { |
| CGContextRef cg = (CGContextRef)fCanvas->accessTopRasterHandle(); |
| |
| CGColorRef color = CGColorCreateGenericRGB(SkColorGetR(c)/255.f, |
| SkColorGetG(c)/255.f, |
| SkColorGetB(c)/255.f, |
| SkColorGetA(c)/255.f); |
| |
| CGContextSetFillColorWithColor(cg, color); |
| CGContextFillRect(cg, CGRectMake(r.x(), r.y(), r.width(), r.height())); |
| } |
| }; |
| |
| static CGAffineTransform matrix_to_transform(CGContextRef cg, const SkMatrix& ctm) { |
| SkMatrix matrix; |
| matrix.setScale(1, -1); |
| matrix.postTranslate(0, SkIntToScalar(CGBitmapContextGetHeight(cg))); |
| matrix.preConcat(ctm); |
| |
| return CGAffineTransformMake(matrix[SkMatrix::kMScaleX], |
| matrix[SkMatrix::kMSkewY], |
| matrix[SkMatrix::kMSkewX], |
| matrix[SkMatrix::kMScaleY], |
| matrix[SkMatrix::kMTransX], |
| matrix[SkMatrix::kMTransY]); |
| } |
| |
| class CGAllocator : public SkRasterHandleAllocator { |
| public: |
| CGAllocator() {} |
| |
| bool allocHandle(const SkImageInfo& info, Rec* rec) override { |
| // let CG allocate the pixels |
| CGContextRef cg = SkCreateCGContext(SkPixmap(info, nullptr, 0)); |
| if (!cg) { |
| return false; |
| } |
| rec->fReleaseProc = [](void* pixels, void* ctx){ CGContextRelease((CGContextRef)ctx); }; |
| rec->fReleaseCtx = cg; |
| rec->fPixels = CGBitmapContextGetData(cg); |
| rec->fRowBytes = CGBitmapContextGetBytesPerRow(cg); |
| rec->fHandle = cg; |
| CGContextSaveGState(cg); // balanced each time updateHandle is called |
| return true; |
| } |
| |
| void updateHandle(Handle hndl, const SkMatrix& ctm, const SkIRect& clip) override { |
| CGContextRef cg = (CGContextRef)hndl; |
| |
| CGContextRestoreGState(cg); |
| CGContextSaveGState(cg); |
| CGContextClipToRect(cg, CGRectMake(clip.x(), clip.y(), clip.width(), clip.height())); |
| CGContextConcatCTM(cg, matrix_to_transform(cg, ctm)); |
| } |
| }; |
| |
| using MyPort = CGGraphicsPort; |
| using MyAllocator = CGAllocator; |
| |
| #elif defined(SK_BUILD_FOR_WIN) |
| |
| #include "src/core/SkLeanWindows.h" |
| |
| static RECT toRECT(const SkIRect& r) { |
| return { r.left(), r.top(), r.right(), r.bottom() }; |
| } |
| |
| class GDIGraphicsPort : public GraphicsPort { |
| public: |
| GDIGraphicsPort(SkCanvas* canvas) : GraphicsPort(canvas) {} |
| |
| void drawRect(const SkRect& r, SkColor c) override { |
| HDC hdc = (HDC)fCanvas->accessTopRasterHandle(); |
| |
| COLORREF cr = RGB(SkColorGetR(c), SkColorGetG(c), SkColorGetB(c));// SkEndian_Swap32(c) >> 8; |
| RECT rounded = toRECT(r.round()); |
| FillRect(hdc, &rounded, CreateSolidBrush(cr)); |
| |
| // Assuming GDI wrote zeros for alpha, this will or-in 0xFF for alpha |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kDstATop); |
| fCanvas->drawRect(r, paint); |
| } |
| }; |
| |
| // We use this static factory function instead of the regular constructor so |
| // that we can create the pixel data before calling the constructor. This is |
| // required so that we can call the base class' constructor with the pixel |
| // data. |
| static bool Create(int width, int height, bool is_opaque, SkRasterHandleAllocator::Rec* rec) { |
| BITMAPINFOHEADER hdr; |
| memset(&hdr, 0, sizeof(hdr)); |
| hdr.biSize = sizeof(BITMAPINFOHEADER); |
| hdr.biWidth = width; |
| hdr.biHeight = -height; // Minus means top-down bitmap. |
| hdr.biPlanes = 1; |
| hdr.biBitCount = 32; |
| hdr.biCompression = BI_RGB; // No compression. |
| hdr.biSizeImage = 0; |
| hdr.biXPelsPerMeter = 1; |
| hdr.biYPelsPerMeter = 1; |
| void* pixels; |
| HBITMAP hbitmap = CreateDIBSection(nullptr, (const BITMAPINFO*)&hdr, 0, &pixels, 0, 0); |
| if (!hbitmap) { |
| return false; |
| } |
| |
| size_t row_bytes = width * sizeof(SkPMColor); |
| sk_bzero(pixels, row_bytes * height); |
| |
| HDC hdc = CreateCompatibleDC(nullptr); |
| if (!hdc) { |
| DeleteObject(hbitmap); |
| return false; |
| } |
| SetGraphicsMode(hdc, GM_ADVANCED); |
| HGDIOBJ origBitmap = SelectObject(hdc, hbitmap); |
| |
| struct ReleaseContext { |
| HDC hdc; |
| HGDIOBJ hbitmap; |
| }; |
| rec->fReleaseProc = [](void*, void* context) { |
| ReleaseContext* ctx = static_cast<ReleaseContext*>(context); |
| HBITMAP hbitmap = static_cast<HBITMAP>(SelectObject(ctx->hdc, ctx->hbitmap)); |
| DeleteObject(hbitmap); |
| DeleteDC(ctx->hdc); |
| delete ctx; |
| }; |
| rec->fReleaseCtx = new ReleaseContext{hdc, origBitmap}; |
| rec->fPixels = pixels; |
| rec->fRowBytes = row_bytes; |
| rec->fHandle = hdc; |
| return true; |
| } |
| |
| /** |
| * Subclass of SkRasterHandleAllocator that returns an HDC as its "handle". |
| */ |
| class GDIAllocator : public SkRasterHandleAllocator { |
| public: |
| GDIAllocator() {} |
| |
| bool allocHandle(const SkImageInfo& info, Rec* rec) override { |
| SkASSERT(info.colorType() == kN32_SkColorType); |
| return Create(info.width(), info.height(), info.isOpaque(), rec); |
| } |
| |
| void updateHandle(Handle handle, const SkMatrix& ctm, const SkIRect& clip_bounds) override { |
| HDC hdc = static_cast<HDC>(handle); |
| |
| XFORM xf; |
| xf.eM11 = ctm[SkMatrix::kMScaleX]; |
| xf.eM21 = ctm[SkMatrix::kMSkewX]; |
| xf.eDx = ctm[SkMatrix::kMTransX]; |
| xf.eM12 = ctm[SkMatrix::kMSkewY]; |
| xf.eM22 = ctm[SkMatrix::kMScaleY]; |
| xf.eDy = ctm[SkMatrix::kMTransY]; |
| SetWorldTransform(hdc, &xf); |
| |
| RECT clip_bounds_RECT = toRECT(clip_bounds); |
| HRGN hrgn = CreateRectRgnIndirect(&clip_bounds_RECT); |
| [[maybe_unused]] int result = SelectClipRgn(hdc, hrgn); |
| SkASSERT(result != ERROR); |
| result = DeleteObject(hrgn); |
| SkASSERT(result != 0); |
| } |
| }; |
| |
| using MyPort = GDIGraphicsPort; |
| using MyAllocator = GDIAllocator; |
| |
| #else |
| |
| using MyPort = SkiaGraphicsPort; |
| using MyAllocator = SkiaAllocator; |
| |
| #endif |
| |
| DEF_SIMPLE_GM(rasterallocator, canvas, 600, 300) { |
| auto doDraw = [](GraphicsPort* port) { |
| SkAutoCanvasRestore acr(port->peekCanvas(), true); |
| |
| port->drawRect({0, 0, 256, 256}, SK_ColorRED); |
| port->save(); |
| port->translate(30, 30); |
| port->drawRect({0, 0, 30, 30}, SK_ColorBLUE); |
| port->drawOval({10, 10, 20, 20}, SK_ColorWHITE); |
| port->restore(); |
| |
| port->saveLayer({50, 50, 100, 100}, 0x80); |
| port->drawRect({55, 55, 95, 95}, SK_ColorGREEN); |
| port->restore(); |
| |
| port->clip({150, 50, 200, 200}); |
| port->drawRect({0, 0, 256, 256}, 0xFFCCCCCC); |
| }; |
| |
| // TODO: this common code fails pic-8888 and serialize-8888 |
| //GraphicsPort skiaPort(canvas); |
| //doDraw(&skiaPort); |
| |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256); |
| std::unique_ptr<SkCanvas> nativeCanvas = |
| SkRasterHandleAllocator::MakeCanvas(std::make_unique<MyAllocator>(), info); |
| MyPort nativePort(nativeCanvas.get()); |
| doDraw(&nativePort); |
| |
| SkPixmap pm; |
| nativeCanvas->peekPixels(&pm); |
| canvas->drawImage(SkImage::MakeRasterCopy(pm), 280, 0); |
| } |