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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkSurface.h"
- #include "src/core/SkAutoMalloc.h"
- #include "tools/sk_app/RasterWindowContext.h"
- #include "tools/sk_app/win/WindowContextFactory_win.h"
- #include <Windows.h>
- using sk_app::RasterWindowContext;
- using sk_app::DisplayParams;
- namespace {
- class RasterWindowContext_win : public RasterWindowContext {
- public:
- RasterWindowContext_win(HWND, const DisplayParams&);
- sk_sp<SkSurface> getBackbufferSurface() override;
- void swapBuffers() override;
- bool isValid() override { return SkToBool(fWnd); }
- void resize(int w, int h) override;
- void setDisplayParams(const DisplayParams& params) override;
- protected:
- SkAutoMalloc fSurfaceMemory;
- sk_sp<SkSurface> fBackbufferSurface;
- HWND fWnd;
- private:
- typedef RasterWindowContext INHERITED;
- };
- RasterWindowContext_win::RasterWindowContext_win(HWND wnd, const DisplayParams& params)
- : INHERITED(params)
- , fWnd(wnd) {
- RECT rect;
- GetClientRect(wnd, &rect);
- this->resize(rect.right - rect.left, rect.bottom - rect.top);
- }
- void RasterWindowContext_win::setDisplayParams(const DisplayParams& params) {
- fDisplayParams = params;
- RECT rect;
- GetClientRect(fWnd, &rect);
- this->resize(rect.right - rect.left, rect.bottom - rect.top);
- }
- void RasterWindowContext_win::resize(int w, int h) {
- fWidth = w;
- fHeight = h;
- fBackbufferSurface.reset();
- const size_t bmpSize = sizeof(BITMAPINFOHEADER) + w * h * sizeof(uint32_t);
- fSurfaceMemory.reset(bmpSize);
- BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
- ZeroMemory(bmpInfo, sizeof(BITMAPINFO));
- bmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
- bmpInfo->bmiHeader.biWidth = w;
- bmpInfo->bmiHeader.biHeight = -h; // negative means top-down bitmap. Skia draws top-down.
- bmpInfo->bmiHeader.biPlanes = 1;
- bmpInfo->bmiHeader.biBitCount = 32;
- bmpInfo->bmiHeader.biCompression = BI_RGB;
- void* pixels = bmpInfo->bmiColors;
- SkImageInfo info = SkImageInfo::Make(w, h, fDisplayParams.fColorType, kPremul_SkAlphaType,
- fDisplayParams.fColorSpace);
- fBackbufferSurface = SkSurface::MakeRasterDirect(info, pixels, sizeof(uint32_t) * w);
- }
- sk_sp<SkSurface> RasterWindowContext_win::getBackbufferSurface() { return fBackbufferSurface; }
- void RasterWindowContext_win::swapBuffers() {
- BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
- HDC dc = GetDC(fWnd);
- StretchDIBits(dc, 0, 0, fWidth, fHeight, 0, 0, fWidth, fHeight, bmpInfo->bmiColors, bmpInfo,
- DIB_RGB_COLORS, SRCCOPY);
- ReleaseDC(fWnd, dc);
- }
- } // anonymous namespace
- namespace sk_app {
- namespace window_context_factory {
- WindowContext* NewRasterForWin(HWND wnd, const DisplayParams& params) {
- WindowContext* ctx = new RasterWindowContext_win(wnd, params);
- if (!ctx->isValid()) {
- delete ctx;
- ctx = nullptr;
- }
- return ctx;
- }
- } // namespace window_context_factory
- } // namespace sk_app
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