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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 "tools/sk_app/RasterWindowContext.h"
10 #include "tools/sk_app/unix/WindowContextFactory_unix.h"
11 
12 using sk_app::RasterWindowContext;
13 using sk_app::DisplayParams;
14 
15 namespace {
16 
17 class RasterWindowContext_xlib : public RasterWindowContext {
18 public:
19     RasterWindowContext_xlib(Display*, XWindow, int width, int height, const DisplayParams&);
20 
21     sk_sp<SkSurface> getBackbufferSurface() override;
22     void swapBuffers() override;
isValid()23     bool isValid() override { return SkToBool(fWindow); }
24     void resize(int  w, int h) override;
25     void setDisplayParams(const DisplayParams& params) override;
26 
27 protected:
28     sk_sp<SkSurface> fBackbufferSurface;
29     Display* fDisplay;
30     XWindow  fWindow;
31     GC       fGC;
32 
33     using INHERITED = RasterWindowContext;
34 };
35 
RasterWindowContext_xlib(Display * display,XWindow window,int width,int height,const DisplayParams & params)36 RasterWindowContext_xlib::RasterWindowContext_xlib(Display* display, XWindow window, int width,
37                                                    int height, const DisplayParams& params)
38         : INHERITED(params)
39         , fDisplay(display)
40         , fWindow(window) {
41     fGC = XCreateGC(fDisplay, fWindow, 0, nullptr);
42     this->resize(width, height);
43     fWidth = width;
44     fHeight = height;
45 }
46 
setDisplayParams(const DisplayParams & params)47 void RasterWindowContext_xlib::setDisplayParams(const DisplayParams& params) {
48     fDisplayParams = params;
49     XWindowAttributes attrs;
50     XGetWindowAttributes(fDisplay, fWindow, &attrs);
51     this->resize(attrs.width, attrs.height);
52 }
53 
resize(int w,int h)54 void RasterWindowContext_xlib::resize(int  w, int h) {
55     SkImageInfo info = SkImageInfo::Make(w, h, fDisplayParams.fColorType, kPremul_SkAlphaType,
56                                          fDisplayParams.fColorSpace);
57     fBackbufferSurface = SkSurface::MakeRaster(info, &fDisplayParams.fSurfaceProps);
58 
59 }
60 
getBackbufferSurface()61 sk_sp<SkSurface> RasterWindowContext_xlib::getBackbufferSurface() { return fBackbufferSurface; }
62 
swapBuffers()63 void RasterWindowContext_xlib::swapBuffers() {
64     SkPixmap pm;
65     if (!fBackbufferSurface->peekPixels(&pm)) {
66         return;
67     }
68     int bitsPerPixel = pm.info().bytesPerPixel() * 8;
69     XImage image;
70     memset(&image, 0, sizeof(image));
71     image.width = pm.width();
72     image.height = pm.height();
73     image.format = ZPixmap;
74     image.data = (char*) pm.addr();
75     image.byte_order = LSBFirst;
76     image.bitmap_unit = bitsPerPixel;
77     image.bitmap_bit_order = LSBFirst;
78     image.bitmap_pad = bitsPerPixel;
79     image.depth = 24;
80     image.bytes_per_line = pm.rowBytes() - pm.width() * pm.info().bytesPerPixel();
81     image.bits_per_pixel = bitsPerPixel;
82     if (!XInitImage(&image)) {
83         return;
84     }
85     XPutImage(fDisplay, fWindow, fGC, &image, 0, 0, 0, 0, pm.width(), pm.height());
86 }
87 
88 }  // anonymous namespace
89 
90 namespace sk_app {
91 namespace window_context_factory {
92 
MakeRasterForXlib(const XlibWindowInfo & info,const DisplayParams & params)93 std::unique_ptr<WindowContext> MakeRasterForXlib(const XlibWindowInfo& info,
94                                                  const DisplayParams& params) {
95     std::unique_ptr<WindowContext> ctx(new RasterWindowContext_xlib(
96             info.fDisplay, info.fWindow, info.fWidth, info.fHeight, params));
97     if (!ctx->isValid()) {
98         ctx = nullptr;
99     }
100     return ctx;
101 }
102 
103 }  // namespace window_context_factory
104 }  // namespace sk_app
105