diff options
Diffstat (limited to 'libgralloc/framebuffer.cpp')
| -rw-r--r-- | libgralloc/framebuffer.cpp | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/libgralloc/framebuffer.cpp b/libgralloc/framebuffer.cpp new file mode 100644 index 0000000..6a5497e --- /dev/null +++ b/libgralloc/framebuffer.cpp @@ -0,0 +1,359 @@ +/* + * 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 <sys/mman.h> + +#include <dlfcn.h> + +#include <cutils/ashmem.h> +#include <cutils/log.h> + +#include <hardware/hardware.h> +#include <hardware/gralloc.h> + +#include <fcntl.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <string.h> +#include <stdlib.h> + +#include <cutils/log.h> +#include <cutils/atomic.h> + +#if HAVE_ANDROID_OS +#include <linux/fb.h> +#endif + +#include "gralloc_priv.h" +#include "gr.h" + +/*****************************************************************************/ + +// numbers of buffers for page flipping +#if defined(NO_PAGE_FLIPPING) +// page-flipping is buggy on some devices +#define NUM_BUFFERS 1 +#else +#define NUM_BUFFERS 2 +#endif + + +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) +{ + fb_context_t* ctx = (fb_context_t*)dev; + if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval) + return -EINVAL; + // FIXME: implement fb_setSwapInterval + return 0; +} + +static int fb_setUpdateRect(struct framebuffer_device_t* dev, + int l, int t, int w, int h) +{ + if (((w|h) <= 0) || ((l|t)<0)) + return -EINVAL; + + fb_context_t* ctx = (fb_context_t*)dev; + private_module_t* m = reinterpret_cast<private_module_t*>( + dev->common.module); + m->info.reserved[0] = 0x54445055; // "UPDT"; + m->info.reserved[1] = (uint16_t)l | ((uint32_t)t << 16); + m->info.reserved[2] = (uint16_t)(l+w) | ((uint32_t)(t+h) << 16); + return 0; +} + +static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer) +{ + if (private_handle_t::validate(buffer) < 0) + return -EINVAL; + + fb_context_t* ctx = (fb_context_t*)dev; + + 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) { + LOGE("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) +{ + // 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; + + + uint32_t flags = PAGE_FLIP; + if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) { + info.yres_virtual = info.yres; + flags &= ~PAGE_FLIP; + LOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported"); + } + + if (info.yres_virtual < info.yres * 2) { + // we need at least 2 for page-flipping + info.yres_virtual = info.yres; + flags &= ~PAGE_FLIP; + LOGW("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; + + LOGI( "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 + ); + + LOGI( "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 + */ + + int err; + 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) { + LOGE("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); + int err = mapFrameBufferLocked(module); + 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)) { + alloc_device_t* gralloc_device; + status = gralloc_open(module, &gralloc_device); + if (status < 0) + return status; + + /* 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) + ? HAL_PIXEL_FORMAT_BGRA_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) = 0; + const_cast<int&>(dev->device.maxSwapInterval) = 1; + *device = &dev->device.common; + } + } + return status; +} |