1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* 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 "../RasterWindowContext.h"
#include "SkAutoMalloc.h"
#include "SkSurface.h"
#include "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;
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
|
