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 "../RasterWindowContext.h"
9 #include "SkAutoMalloc.h"
10 #include "SkSurface.h"
11 #include "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 GetWindowRect(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 GetWindowRect(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
NewRasterForWin(HWND wnd,const DisplayParams & params)90 WindowContext* NewRasterForWin(HWND wnd, const DisplayParams& params) {
91 WindowContext* ctx = new RasterWindowContext_win(wnd, params);
92 if (!ctx->isValid()) {
93 delete ctx;
94 ctx = nullptr;
95 }
96 return ctx;
97 }
98
99 } // namespace window_context_factory
100 } // namespace sk_app
101