gecko/widget/gonk/Framebuffer.cpp
2012-05-21 12:12:37 +01:00

188 lines
4.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: sw=2 ts=8 et ft=cpp : */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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"
#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;
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(nsIntSize* aScreenSize)
{
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);
gfxIntSize size(sVi.xres, sVi.yres);
long stride = size.width * bytesPerPixel;
size_t numFrameBytes = stride * size.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, size, stride, format);
}
// Clear the framebuffer to a known state.
Present(nsIntRect());
*aScreenSize = size;
return true;
}
bool
GetSize(nsIntSize *aScreenSize) {
if (0 <= sFd)
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;
}
*aScreenSize = gfxIntSize(sVi.xres, sVi.yres);
return true;
}
void
Close()
{
if (0 > sFd)
return;
munmap(Buffers()[0]->Data(), sMappedSize);
delete sBuffers;
sBuffers = 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