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 typedef RasterWindowContext INHERITED;
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);
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
NewRasterForXlib(const XlibWindowInfo & info,const DisplayParams & params)93 WindowContext* NewRasterForXlib(const XlibWindowInfo& info, const DisplayParams& params) {
94 WindowContext* ctx = new RasterWindowContext_xlib(info.fDisplay, info.fWindow, info.fWidth,
95 info.fHeight, params);
96 if (!ctx->isValid()) {
97 delete ctx;
98 ctx = nullptr;
99 }
100 return ctx;
101 }
102
103 } // namespace window_context_factory
104 } // namespace sk_app
105