modules/gralloc/framebuffer.cpp - platform/hardware/libhardware - Git at Google

 /*
  * 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"

 /*****************************************************************************/

 // 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)
 {
     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) {
             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)
 {
     // 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 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
      */

     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) {
         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);
     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)) {
         /* 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;
         }
     }
     return status;
 }
	/*
	* 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"

	/*****************************************************************************/

	// 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)
	{
	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) {
	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)
	{
	// 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 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
	*/

	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) {
	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);
	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)) {
	/* 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;
	}
	}
	return status;
	}