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f2ed293b9be68db45a6d2dc3fed5d2f504a6f861
android_hardware_libhardware/modules/gralloc/framebuffer.cpp
Peter Collingbourne f2ed293b9b gralloc: Configure framebuffer mode according to requested image format. 
Previously we were ignoring the requested image format when mapping a graphics
device via gralloc_alloc, and using the mode that the framebuffer started up
in. This meant that on devices whose framebuffer starts up in a mode other
than RGBA8888, we would map the framebuffer in the other mode and attempt to
use it as an RGBA8888 framebuffer, which would lead to crashes or incorrecet
rendering. This is the case in the ARM FVP, whose framebuffer starts up in
RGB565 mode.

Unfortunately there is no preferred image format passed in to fb_device_open,
and we presumably cannot start passing one in for backwards compatibility
reasons. Therefore, we set the image format to RGBA8888, which appears to
be the only format that the platform ends up using.

Bug: 142352330
Change-Id: I24000fd36910b4044ce7659605efc423e36cba00
2019-10-15 17:50:25 -07:00

356 lines
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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 <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <cutils/ashmem.h>
#include <cutils/atomic.h>
#include <log/log.h>
#include <hardware/gralloc.h>
#include <hardware/hardware.h>
#ifdef __ANDROID__
#include <linux/fb.h>
#endif
#include "gralloc_priv.h"
#include "gr.h"
/*****************************************************************************/
// Set TARGET_USE_PAN_DISPLAY to true at compile time if the
// board uses FBIOPAN_DISPLAY to setup page flipping, otherwise
// default ioctl to do page-flipping is FBIOPUT_VSCREENINFO.
#ifndef USE_PAN_DISPLAY
#define USE_PAN_DISPLAY 0
#endif
// numbers of buffers for page flipping
#define NUM_BUFFERS 2
enum {
PAGE_FLIP = 0x00000001,
LOCKED = 0x00000002
};
struct fb_context_t {
framebuffer_device_t device;
};
/*****************************************************************************/
static int fb_setSwapInterval(struct framebuffer_device_t* dev,
int interval)
{
if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
return -EINVAL;
// FIXME: implement fb_setSwapInterval
return 0;
}
static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
{
if (private_handle_t::validate(buffer) < 0)
return -EINVAL;
private_handle_t const* hnd = reinterpret_cast<private_handle_t const*>(buffer);
private_module_t* m = reinterpret_cast<private_module_t*>(
dev->common.module);
if (hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER) {
const size_t offset = hnd->base - m->framebuffer->base;
m->info.activate = FB_ACTIVATE_VBL;
m->info.yoffset = offset / m->finfo.line_length;
if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
ALOGE("FBIOPUT_VSCREENINFO failed");
m->base.unlock(&m->base, buffer);
return -errno;
}
m->currentBuffer = buffer;
} else {
// If we can't do the page_flip, just copy the buffer to the front
// FIXME: use copybit HAL instead of memcpy
void* fb_vaddr;
void* buffer_vaddr;
m->base.lock(&m->base, m->framebuffer,
GRALLOC_USAGE_SW_WRITE_RARELY,
0, 0, m->info.xres, m->info.yres,
&fb_vaddr);
m->base.lock(&m->base, buffer,
GRALLOC_USAGE_SW_READ_RARELY,
0, 0, m->info.xres, m->info.yres,
&buffer_vaddr);
memcpy(fb_vaddr, buffer_vaddr, m->finfo.line_length * m->info.yres);
m->base.unlock(&m->base, buffer);
m->base.unlock(&m->base, m->framebuffer);
}
return 0;
}
/*****************************************************************************/
int mapFrameBufferLocked(struct private_module_t* module, int format)
{
// already initialized...
if (module->framebuffer) {
return 0;
}
char const * const device_template[] = {
"/dev/graphics/fb%u",
"/dev/fb%u",
0 };
int fd = -1;
int i=0;
char name[64];
while ((fd==-1) && device_template[i]) {
snprintf(name, 64, device_template[i], 0);
fd = open(name, O_RDWR, 0);
i++;
}
if (fd < 0)
return -errno;
struct fb_fix_screeninfo finfo;
if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
return -errno;
struct fb_var_screeninfo info;
if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
return -errno;
info.reserved[0] = 0;
info.reserved[1] = 0;
info.reserved[2] = 0;
info.xoffset = 0;
info.yoffset = 0;
info.activate = FB_ACTIVATE_NOW;
/*
* Request NUM_BUFFERS screens (at lest 2 for page flipping)
*/
info.yres_virtual = info.yres * NUM_BUFFERS;
switch (format) {
case HAL_PIXEL_FORMAT_RGBA_8888:
info.bits_per_pixel = 32;
info.red.offset = 0;
info.red.length = 8;
info.green.offset = 8;
info.green.length = 8;
info.blue.offset = 16;
info.blue.length = 8;
break;
default:
ALOGW("unknown format: %d", format);
break;
}
uint32_t flags = PAGE_FLIP;
#if USE_PAN_DISPLAY
if (ioctl(fd, FBIOPAN_DISPLAY, &info) == -1) {
ALOGW("FBIOPAN_DISPLAY failed, page flipping not supported");
#else
if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
ALOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
#endif
info.yres_virtual = info.yres;
flags &= ~PAGE_FLIP;
}
if (info.yres_virtual < info.yres * 2) {
// we need at least 2 for page-flipping
info.yres_virtual = info.yres;
flags &= ~PAGE_FLIP;
ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
info.yres_virtual, info.yres*2);
}
if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
return -errno;
uint64_t refreshQuotient =
(
uint64_t( info.upper_margin + info.lower_margin + info.yres )
* ( info.left_margin + info.right_margin + info.xres )
* info.pixclock
);
/* Beware, info.pixclock might be 0 under emulation, so avoid a
* division-by-0 here (SIGFPE on ARM) */
int refreshRate = refreshQuotient > 0 ? (int)(1000000000000000LLU / refreshQuotient) : 0;
if (refreshRate == 0) {
// bleagh, bad info from the driver
refreshRate = 60*1000; // 60 Hz
}
if (int(info.width) <= 0 || int(info.height) <= 0) {
// the driver doesn't return that information
// default to 160 dpi
info.width = ((info.xres * 25.4f)/160.0f + 0.5f);
info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
}
float xdpi = (info.xres * 25.4f) / info.width;
float ydpi = (info.yres * 25.4f) / info.height;
float fps = refreshRate / 1000.0f;
ALOGI( "using (fd=%d)\n"
"id = %s\n"
"xres = %d px\n"
"yres = %d px\n"
"xres_virtual = %d px\n"
"yres_virtual = %d px\n"
"bpp = %d\n"
"r = %2u:%u\n"
"g = %2u:%u\n"
"b = %2u:%u\n",
fd,
finfo.id,
info.xres,
info.yres,
info.xres_virtual,
info.yres_virtual,
info.bits_per_pixel,
info.red.offset, info.red.length,
info.green.offset, info.green.length,
info.blue.offset, info.blue.length
);
ALOGI( "width = %d mm (%f dpi)\n"
"height = %d mm (%f dpi)\n"
"refresh rate = %.2f Hz\n",
info.width, xdpi,
info.height, ydpi,
fps
);
if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
return -errno;
if (finfo.smem_len <= 0)
return -errno;
module->flags = flags;
module->info = info;
module->finfo = finfo;
module->xdpi = xdpi;
module->ydpi = ydpi;
module->fps = fps;
/*
* map the framebuffer
*/
size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres_virtual);
module->framebuffer = new private_handle_t(dup(fd), fbSize, 0);
module->numBuffers = info.yres_virtual / info.yres;
module->bufferMask = 0;
void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (vaddr == MAP_FAILED) {
ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
return -errno;
}
module->framebuffer->base = intptr_t(vaddr);
memset(vaddr, 0, fbSize);
return 0;
}
static int mapFrameBuffer(struct private_module_t* module)
{
pthread_mutex_lock(&module->lock);
// Request RGBA8888 because the platform assumes support for RGBA8888.
int err = mapFrameBufferLocked(module, HAL_PIXEL_FORMAT_RGBA_8888);
pthread_mutex_unlock(&module->lock);
return err;
}
/*****************************************************************************/
static int fb_close(struct hw_device_t *dev)
{
fb_context_t* ctx = (fb_context_t*)dev;
if (ctx) {
free(ctx);
}
return 0;
}
int fb_device_open(hw_module_t const* module, const char* name,
hw_device_t** device)
{
int status = -EINVAL;
if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
/* initialize our state here */
fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
memset(dev, 0, sizeof(*dev));
/* initialize the procs */
dev->device.common.tag = HARDWARE_DEVICE_TAG;
dev->device.common.version = 0;
dev->device.common.module = const_cast<hw_module_t*>(module);
dev->device.common.close = fb_close;
dev->device.setSwapInterval = fb_setSwapInterval;
dev->device.post = fb_post;
dev->device.setUpdateRect = 0;
private_module_t* m = (private_module_t*)module;
status = mapFrameBuffer(m);
if (status >= 0) {
int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
int format = (m->info.bits_per_pixel == 32)
? (m->info.red.offset ? HAL_PIXEL_FORMAT_BGRA_8888 : HAL_PIXEL_FORMAT_RGBX_8888)
: HAL_PIXEL_FORMAT_RGB_565;
const_cast<uint32_t&>(dev->device.flags) = 0;
const_cast<uint32_t&>(dev->device.width) = m->info.xres;
const_cast<uint32_t&>(dev->device.height) = m->info.yres;
const_cast<int&>(dev->device.stride) = stride;
const_cast<int&>(dev->device.format) = format;
const_cast<float&>(dev->device.xdpi) = m->xdpi;
const_cast<float&>(dev->device.ydpi) = m->ydpi;
const_cast<float&>(dev->device.fps) = m->fps;
const_cast<int&>(dev->device.minSwapInterval) = 1;
const_cast<int&>(dev->device.maxSwapInterval) = 1;
*device = &dev->device.common;
} else {
free(dev);
}
}
return status;
}
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