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
RasterWindowContext_win(HWND wnd,const DisplayParams & params)36 RasterWindowContext_win::RasterWindowContext_win(HWND wnd, const DisplayParams& params)
37 : fWnd(wnd) {
38 fDisplayParams = params;
39 RECT rect;
40 GetWindowRect(wnd, &rect);
41 this->resize(rect.right - rect.left, rect.bottom - rect.top);
42 }
43
setDisplayParams(const DisplayParams & params)44 void RasterWindowContext_win::setDisplayParams(const DisplayParams& params) {
45 fDisplayParams = params;
46 RECT rect;
47 GetWindowRect(fWnd, &rect);
48 this->resize(rect.right - rect.left, rect.bottom - rect.top);
49 }
50
resize(int w,int h)51 void RasterWindowContext_win::resize(int w, int h) {
52 fWidth = w;
53 fHeight = h;
54 fBackbufferSurface.reset();
55 const size_t bmpSize = sizeof(BITMAPINFOHEADER) + w * h * sizeof(uint32_t);
56 fSurfaceMemory.reset(bmpSize);
57 BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
58 ZeroMemory(bmpInfo, sizeof(BITMAPINFO));
59 bmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
60 bmpInfo->bmiHeader.biWidth = w;
61 bmpInfo->bmiHeader.biHeight = -h; // negative means top-down bitmap. Skia draws top-down.
62 bmpInfo->bmiHeader.biPlanes = 1;
63 bmpInfo->bmiHeader.biBitCount = 32;
64 bmpInfo->bmiHeader.biCompression = BI_RGB;
65 void* pixels = bmpInfo->bmiColors;
66
67 SkImageInfo info = SkImageInfo::Make(w, h, fDisplayParams.fColorType, kPremul_SkAlphaType,
68 fDisplayParams.fColorSpace);
69 fBackbufferSurface = SkSurface::MakeRasterDirect(info, pixels, sizeof(uint32_t) * w);
70 }
71
getBackbufferSurface()72 sk_sp<SkSurface> RasterWindowContext_win::getBackbufferSurface() { return fBackbufferSurface; }
73
swapBuffers()74 void RasterWindowContext_win::swapBuffers() {
75 BITMAPINFO* bmpInfo = reinterpret_cast<BITMAPINFO*>(fSurfaceMemory.get());
76 HDC dc = GetDC(fWnd);
77 StretchDIBits(dc, 0, 0, fWidth, fHeight, 0, 0, fWidth, fHeight, bmpInfo->bmiColors, bmpInfo,
78 DIB_RGB_COLORS, SRCCOPY);
79 ReleaseDC(fWnd, dc);
80 }
81
82 } // anonymous namespace
83
84 namespace sk_app {
85 namespace window_context_factory {
86
NewRasterForWin(HWND wnd,const DisplayParams & params)87 WindowContext* NewRasterForWin(HWND wnd, const DisplayParams& params) {
88 WindowContext* ctx = new RasterWindowContext_win(wnd, params);
89 if (!ctx->isValid()) {
90 delete ctx;
91 ctx = nullptr;
92 }
93 return ctx;
94 }
95
96 } // namespace window_context_factory
97 } // namespace sk_app
98