gecko-dev/widget/gonk/Framebuffer.cpp

208 lines
5.1 KiB
C++

/* -*- 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.
gfxASurface::gfxImageFormat format = gfxASurface::ImageFormatRGB16_565;
int bytesPerPixel = gfxASurface::BytePerPixelFromFormat(format);
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 = NULL;
delete sScreenSize;
sScreenSize = NULL;
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