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Unified Diff: tools/viewer/sk_app/win/RasterWindowContext_win.cpp

Issue 2182273002: SW backend for viewer on Windows (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: update Created 4 years, 5 months ago
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Index: tools/viewer/sk_app/win/RasterWindowContext_win.cpp
diff --git a/tools/viewer/sk_app/win/RasterWindowContext_win.cpp b/tools/viewer/sk_app/win/RasterWindowContext_win.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ca738db28812bdb68af371187444e8693b11ec7f
--- /dev/null
+++ b/tools/viewer/sk_app/win/RasterWindowContext_win.cpp
@@ -0,0 +1,96 @@
+/*
+ * 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 "WindowContextFactory_win.h"
+#include "../RasterWindowContext.h"
+#include "SkSurface.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;
+};
+
+RasterWindowContext_win::RasterWindowContext_win(HWND wnd, const DisplayParams& params)
+ : fWnd(wnd) {
+ fDisplayParams = params;
+ RECT rect;
+ GetWindowRect(wnd, &rect);
+ this->resize(rect.right - rect.left, rect.bottom - rect.top);
+}
+
+void RasterWindowContext_win::setDisplayParams(const DisplayParams& params) {
+ fDisplayParams = params;
+ RECT rect;
+ GetWindowRect(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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