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