The Tor Browser: widget/gonk/Framebuffer.cpp@b8a032363ba2 (annotated)

widget/gonk/Framebuffer.cpp@b8a032363ba2 (annotated)

widget/gonk/Framebuffer.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* Copyright 2012 Mozilla Foundation and Mozilla contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #include <fcntl.h>
 #include <linux/fb.h>
 #include <linux/kd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <vector>
 #include "android/log.h"
 #include "Framebuffer.h"
 #include "gfxContext.h"
 #include "gfxImageSurface.h"
 #include "gfxUtils.h"
 #include "mozilla/FileUtils.h"
 #include "nsTArray.h"
 #include "nsRegion.h"
 #define LOG(args...)  __android_log_print(ANDROID_LOG_INFO, "Gonk" , ## args)
 using namespace std;
 namespace mozilla {
 namespace Framebuffer {
 static int sFd = -1;
 static size_t sMappedSize;
 static struct fb_var_screeninfo sVi;
 static size_t sActiveBuffer;
 typedef vector<nsRefPtr<gfxImageSurface> > BufferVector;
 BufferVector* sBuffers;
 static gfxIntSize *sScreenSize = nullptr;
 BufferVector& Buffers() { return *sBuffers; }
 bool
 SetGraphicsMode()
 {
     ScopedClose fd(open("/dev/tty0", O_RDWR | O_SYNC));
     if (0 > fd.get()) {
         // This is non-fatal; post-Cupcake kernels don't have tty0.
         LOG("No /dev/tty0?");
     } else if (ioctl(fd.get(), KDSETMODE, (void*) KD_GRAPHICS)) {
         LOG("Error setting graphics mode on /dev/tty0");
         return false;
     }
     return true;
 }
 bool
 Open()
 {
     if (0 <= sFd)
         return true;
     if (!SetGraphicsMode())
         return false;
     ScopedClose fd(open("/dev/graphics/fb0", O_RDWR));
     if (0 > fd.get()) {
         LOG("Error opening framebuffer device");
         return false;
     }
     struct fb_fix_screeninfo fi;
     if (0 > ioctl(fd.get(), FBIOGET_FSCREENINFO, &fi)) {
         LOG("Error getting fixed screeninfo");
         return false;
     }
     if (0 > ioctl(fd.get(), FBIOGET_VSCREENINFO, &sVi)) {
         LOG("Error getting variable screeninfo");
         return false;
     }
     sMappedSize = fi.smem_len;
     void* mem = mmap(0, sMappedSize, PROT_READ | PROT_WRITE, MAP_SHARED,
                      fd.rwget(), 0);
     if (MAP_FAILED == mem) {
         LOG("Error mmap'ing framebuffer");
         return false;
     }
     sFd = fd.get();
     fd.forget();
     // The android porting doc requires a /dev/graphics/fb0 device
     // that's double buffered with r5g6b5 format.  Hence the
     // hard-coded numbers here.
     gfxImageFormat format = gfxImageFormat::RGB16_565;
     if (!sScreenSize) {
         sScreenSize = new gfxIntSize(sVi.xres, sVi.yres);
     }
     long stride = fi.line_length;
     size_t numFrameBytes = stride * sScreenSize->height;
     sBuffers = new BufferVector(2);
     unsigned char* data = static_cast<unsigned char*>(mem);
     for (size_t i = 0; i < 2; ++i, data += numFrameBytes) {
       memset(data, 0, numFrameBytes);
       Buffers()[i] = new gfxImageSurface(data, *sScreenSize, stride, format);
     }
     // Clear the framebuffer to a known state.
     Present(nsIntRect());
     return true;
 }
 bool
 GetSize(nsIntSize *aScreenSize) {
     // If the framebuffer has been opened, we should always have the size.
     if (sScreenSize) {
         *aScreenSize = *sScreenSize;
         return true;
     }
     ScopedClose fd(open("/dev/graphics/fb0", O_RDWR));
     if (0 > fd.get()) {
         LOG("Error opening framebuffer device");
         return false;
     }
     if (0 > ioctl(fd.get(), FBIOGET_VSCREENINFO, &sVi)) {
         LOG("Error getting variable screeninfo");
         return false;
     }
     sScreenSize = new gfxIntSize(sVi.xres, sVi.yres);
     *aScreenSize = *sScreenSize;
     return true;
 }
 void
 Close()
 {
     if (0 > sFd)
         return;
     munmap(Buffers()[0]->Data(), sMappedSize);
     delete sBuffers;
     sBuffers = nullptr;
     delete sScreenSize;
     sScreenSize = nullptr;
     close(sFd);
     sFd = -1;
 }
 gfxASurface*
 BackBuffer()
 {
     return Buffers()[!sActiveBuffer];
 }
 static gfxASurface*
 FrontBuffer()
 {
     return Buffers()[sActiveBuffer];
 }
 void
 Present(const nsIntRegion& aUpdated)
 {
     sActiveBuffer = !sActiveBuffer;
     sVi.yres_virtual = sVi.yres * 2;
     sVi.yoffset = sActiveBuffer * sVi.yres;
     sVi.bits_per_pixel = 16;
     if (ioctl(sFd, FBIOPUT_VSCREENINFO, &sVi) < 0) {
         LOG("Error presenting front buffer");
     }
     nsRefPtr<gfxContext> ctx = new gfxContext(BackBuffer());
     gfxUtils::PathFromRegion(ctx, aUpdated);
     ctx->Clip();
     ctx->SetSource(FrontBuffer());
     ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
     ctx->Paint(1.0);
 }
 } // namespace Framebuffer
 } // namespace mozilla

The Tor Browser / annotate

widget/gonk/Framebuffer.cpp@b8a032363ba2 (annotated)

widget/gonk/Framebuffer.cpp