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1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "include/core/SkSurface.h"
9 #include "src/core/SkAutoMalloc.h"
10 #include "tools/sk_app/RasterWindowContext.h"
11 #include "tools/sk_app/win/WindowContextFactory_win.h"
12 
13 #include <Windows.h>
14 
15 using sk_app::RasterWindowContext;
16 using sk_app::DisplayParams;
17 
18 namespace {
19 
20 class RasterWindowContext_win : public RasterWindowContext {
21 public:
22     RasterWindowContext_win(HWND, const DisplayParams&);
23 
24     sk_sp<SkSurface> getBackbufferSurface() override;
25     void swapBuffers() override;
isValid()26     bool isValid() override { return SkToBool(fWnd); }
27     void resize(int w, int h) override;
28     void setDisplayParams(const DisplayParams& params) override;
29 
30 protected:
31     SkAutoMalloc fSurfaceMemory;
32     sk_sp<SkSurface> fBackbufferSurface;
33     HWND fWnd;
34 
35 private:
36     typedef RasterWindowContext INHERITED;
37 };
38 
RasterWindowContext_win(HWND wnd,const DisplayParams & params)39 RasterWindowContext_win::RasterWindowContext_win(HWND wnd, const DisplayParams& params)
40     : INHERITED(params)
41     , fWnd(wnd) {
42     RECT rect;
43     GetClientRect(wnd, &rect);
44     this->resize(rect.right - rect.left, rect.bottom - rect.top);
45 }
46 
setDisplayParams(const DisplayParams & params)47 void RasterWindowContext_win::setDisplayParams(const DisplayParams& params) {
48     fDisplayParams = params;
49     RECT rect;
50     GetClientRect(fWnd, &rect);
51     this->resize(rect.right - rect.left, rect.bottom - rect.top);
52 }
53 
resize(int w,int h)54 void RasterWindowContext_win::resize(int w, int h) {
55     fWidth = w;
56     fHeight = h;
57     fBackbufferSurface.reset();
58     const size_t bmpSize = sizeof(BITMAPINFOHEADER) + w * h * sizeof(uint32_t);
59     fSurfaceMemory.reset(bmpSize);
60     BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
61     ZeroMemory(bmpInfo, sizeof(BITMAPINFO));
62     bmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
63     bmpInfo->bmiHeader.biWidth = w;
64     bmpInfo->bmiHeader.biHeight = -h; // negative means top-down bitmap. Skia draws top-down.
65     bmpInfo->bmiHeader.biPlanes = 1;
66     bmpInfo->bmiHeader.biBitCount = 32;
67     bmpInfo->bmiHeader.biCompression = BI_RGB;
68     void* pixels = bmpInfo->bmiColors;
69 
70     SkImageInfo info = SkImageInfo::Make(w, h, fDisplayParams.fColorType, kPremul_SkAlphaType,
71                                          fDisplayParams.fColorSpace);
72     fBackbufferSurface = SkSurface::MakeRasterDirect(info, pixels, sizeof(uint32_t) * w);
73 }
74 
getBackbufferSurface()75 sk_sp<SkSurface> RasterWindowContext_win::getBackbufferSurface() { return fBackbufferSurface; }
76 
swapBuffers()77 void RasterWindowContext_win::swapBuffers() {
78     BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
79     HDC dc = GetDC(fWnd);
80     StretchDIBits(dc, 0, 0, fWidth, fHeight, 0, 0, fWidth, fHeight, bmpInfo->bmiColors, bmpInfo,
81                   DIB_RGB_COLORS, SRCCOPY);
82     ReleaseDC(fWnd, dc);
83 }
84 
85 }  // anonymous namespace
86 
87 namespace sk_app {
88 namespace window_context_factory {
89 
MakeRasterForWin(HWND wnd,const DisplayParams & params)90 std::unique_ptr<WindowContext> MakeRasterForWin(HWND wnd, const DisplayParams& params) {
91     std::unique_ptr<WindowContext> ctx(new RasterWindowContext_win(wnd, params));
92     if (!ctx->isValid()) {
93         ctx = nullptr;
94     }
95     return ctx;
96 }
97 
98 }  // namespace window_context_factory
99 }  // namespace sk_app
100