minuitwrp/graphics_overlay.cpp - android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2014 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 <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>

 #include <fcntl.h>
 #include <stdio.h>

 #include <sys/cdefs.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/types.h>

 #include <linux/fb.h>
 #include <linux/kd.h>

 #ifdef MSM_BSP
 #include <linux/msm_mdp.h>
 #include <linux/msm_ion.h>
 #endif

 #include "minui.h"
 #include "graphics.h"
 #include <pixelflinger/pixelflinger.h>

 #define MDP_V4_0 400
 #define MAX_DISPLAY_DIM  2048

 static GRSurface* overlay_init(minui_backend*);
 static GRSurface* overlay_flip(minui_backend*);
 static void overlay_blank(minui_backend*, bool);
 static void overlay_exit(minui_backend*);

 static GRSurface gr_framebuffer;
 static GRSurface* gr_draw = NULL;
 static int displayed_buffer;

 static fb_var_screeninfo vi;
 static int fb_fd = -1;
 static bool isMDP5 = false;
 static int leftSplit = 0;
 static int rightSplit = 0;
 #define ALIGN(x, align) (((x) + ((align)-1)) & ~((align)-1))

 static size_t frame_size = 0;

 #ifdef MSM_BSP
 typedef struct {
     unsigned char *mem_buf;
     int size;
     int ion_fd;
     int mem_fd;
     struct ion_handle_data handle_data;
 } memInfo;

 //Left and right overlay id
 static int overlayL_id = MSMFB_NEW_REQUEST;
 static int overlayR_id = MSMFB_NEW_REQUEST;

 static memInfo mem_info;

 static int map_mdp_pixel_format()
 {
     if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGB_565)
         return MDP_RGB_565;
     else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_BGRA_8888)
         return MDP_BGRA_8888;
     else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGBA_8888)
         return MDP_RGBA_8888;
     else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGBX_8888)
         return MDP_RGBA_8888;
     printf("No known pixel format for map_mdp_pixel_format, defaulting to MDP_RGB_565.\n");
     return MDP_RGB_565;
 }
 #endif // MSM_BSP

 static minui_backend my_backend = {
     .init = overlay_init,
     .flip = overlay_flip,
     .blank = overlay_blank,
     .exit = overlay_exit,
 };

 bool target_has_overlay(char *version)
 {
     int ret;
     int mdp_version;
     bool overlay_supported = false;

     if (strlen(version) >= 8) {
         if(!strncmp(version, "msmfb", strlen("msmfb"))) {
             char str_ver[4];
             memcpy(str_ver, version + strlen("msmfb"), 3);
             str_ver[3] = '\0';
             mdp_version = atoi(str_ver);
             if (mdp_version >= MDP_V4_0) {
                 overlay_supported = true;
             }
         } else if (!strncmp(version, "mdssfb", strlen("mdssfb"))) {
             overlay_supported = true;
             isMDP5 = true;
         }
     }

     return overlay_supported;
 }

 minui_backend* open_overlay() {
     fb_fix_screeninfo fi;
     int fd;

     fd = open("/dev/graphics/fb0", O_RDWR);
     if (fd < 0) {
         perror("open_overlay cannot open fb0");
         return NULL;
     }

     if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
         perror("failed to get fb0 info");
         close(fd);
         return NULL;
     }

     if (target_has_overlay(fi.id)) {
 #ifdef MSM_BSP
         close(fd);
         return &my_backend;
 #else
         printf("Overlay graphics may work (%s), but not enabled. Use TW_TARGET_USES_QCOM_BSP := true to enable.\n", fi.id);
 #endif
     }
     close(fd);
     return NULL;
 }

 static void overlay_blank(minui_backend* backend __unused, bool blank)
 {
 #if defined(TW_NO_SCREEN_BLANK) && defined(TW_BRIGHTNESS_PATH) && defined(TW_MAX_BRIGHTNESS)
     int fd;
     char brightness[4];
     snprintf(brightness, 4, "%03d", TW_MAX_BRIGHTNESS/2);

     fd = open(TW_BRIGHTNESS_PATH, O_RDWR);
     if (fd < 0) {
         perror("cannot open LCD backlight");
         return;
     }
     write(fd, blank ? "000" : brightness, 3);
     close(fd);

 #ifdef TW_SECONDARY_BRIGHTNESS_PATH
     fd = open(TW_SECONDARY_BRIGHTNESS_PATH, O_RDWR);
     if (fd < 0) {
         perror("cannot open LCD backlight 2");
         return;
     }
     write(fd, blank ? "000" : brightness, 3);
     close(fd);
 #endif
 #else
     int ret;

     ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
     if (ret < 0)
         perror("ioctl(): blank");
 #endif
 }

 #ifdef MSM_BSP
 void setDisplaySplit(void) {
     char split[64] = {0};
     if (!isMDP5)
         return;
     FILE* fp = fopen("/sys/class/graphics/fb0/msm_fb_split", "r");
     if (fp) {
         //Format "left right" space as delimiter
         if(fread(split, sizeof(char), 64, fp)) {
             leftSplit = atoi(split);
             printf("Left Split=%d\n",leftSplit);
             char *rght = strpbrk(split, " ");
             if (rght)
                 rightSplit = atoi(rght + 1);
             printf("Right Split=%d\n", rightSplit);
         }
     } else {
         printf("Failed to open mdss_fb_split node\n");
     }
     if (fp)
         fclose(fp);
 }

 int getLeftSplit(void) {
    //Default even split for all displays with high res
    int lSplit = vi.xres / 2;

    //Override if split published by driver
    if (leftSplit)
        lSplit = leftSplit;

    return lSplit;
 }

 int getRightSplit(void) {
    return rightSplit;
 }

 int free_ion_mem(void) {
     int ret = 0;

     if (mem_info.mem_buf)
         munmap(mem_info.mem_buf, mem_info.size);

     if (mem_info.ion_fd >= 0) {
         ret = ioctl(mem_info.ion_fd, ION_IOC_FREE, &mem_info.handle_data);
         if (ret < 0)
             perror("free_mem failed ");
     }

     if (mem_info.mem_fd >= 0)
         close(mem_info.mem_fd);
     if (mem_info.ion_fd >= 0)
         close(mem_info.ion_fd);

     memset(&mem_info, 0, sizeof(mem_info));
     mem_info.mem_fd = -1;
     mem_info.ion_fd = -1;
     return 0;
 }

 int alloc_ion_mem(unsigned int size)
 {
     int result;
     struct ion_fd_data fd_data;
     struct ion_allocation_data ionAllocData;

     mem_info.ion_fd = open("/dev/ion", O_RDWR|O_DSYNC);
     if (mem_info.ion_fd < 0) {
         perror("ERROR: Can't open ion ");
         return -errno;
     }

     ionAllocData.flags = 0;
     ionAllocData.len = size;
     ionAllocData.align = sysconf(_SC_PAGESIZE);
 #ifdef NEW_ION_HEAP
     ionAllocData.heap_id_mask =
 #else
     ionAllocData.heap_mask =
 #endif
             ION_HEAP(ION_IOMMU_HEAP_ID) |
             ION_HEAP(ION_SYSTEM_CONTIG_HEAP_ID);

     result = ioctl(mem_info.ion_fd, ION_IOC_ALLOC,  &ionAllocData);
     if(result){
         perror("ION_IOC_ALLOC Failed ");
         close(mem_info.ion_fd);
         return result;
     }

     fd_data.handle = ionAllocData.handle;
     mem_info.handle_data.handle = ionAllocData.handle;
     result = ioctl(mem_info.ion_fd, ION_IOC_MAP, &fd_data);
     if (result) {
         perror("ION_IOC_MAP Failed ");
         free_ion_mem();
         return result;
     }
     mem_info.mem_buf = (unsigned char *)mmap(NULL, size, PROT_READ |
                 PROT_WRITE, MAP_SHARED, fd_data.fd, 0);
     mem_info.mem_fd = fd_data.fd;

     if (!mem_info.mem_buf) {
         perror("ERROR: mem_buf MAP_FAILED ");
         free_ion_mem();
         return -ENOMEM;
     }

     return 0;
 }

 bool isDisplaySplit(void) {
     if (vi.xres > MAX_DISPLAY_DIM)
         return true;
     //check if right split is set by driver
     if (getRightSplit())
         return true;

     return false;
 }

 int allocate_overlay(int fd, GRSurface gr_fb)
 {
     int ret = 0;

     if (!isDisplaySplit()) {
         // Check if overlay is already allocated
         if (MSMFB_NEW_REQUEST == overlayL_id) {
             struct mdp_overlay overlayL;

             memset(&overlayL, 0 , sizeof (struct mdp_overlay));

             /* Fill Overlay Data */
             overlayL.src.width  = ALIGN(gr_fb.width, 32);
             overlayL.src.height = gr_fb.height;
             overlayL.src.format = map_mdp_pixel_format();
             overlayL.src_rect.w = gr_fb.width;
             overlayL.src_rect.h = gr_fb.height;
             overlayL.dst_rect.w = gr_fb.width;
             overlayL.dst_rect.h = gr_fb.height;
             overlayL.alpha = 0xFF;
 #ifdef BOARD_HAS_FLIPPED_SCREEN
             overlayL.flags = MDP_ROT_180;
 #endif
             overlayL.transp_mask = MDP_TRANSP_NOP;
             overlayL.id = MSMFB_NEW_REQUEST;
             ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayL);
             if (ret < 0) {
                 perror("Overlay Set Failed");
                 return ret;
             }
             overlayL_id = overlayL.id;
         }
     } else {
         float xres = vi.xres;
         int lSplit = getLeftSplit();
         float lSplitRatio = lSplit / xres;
         float lCropWidth = gr_fb.width * lSplitRatio;
         int lWidth = lSplit;
         int rWidth = gr_fb.width - lSplit;
         int height = gr_fb.height;

         if (MSMFB_NEW_REQUEST == overlayL_id) {

             struct mdp_overlay overlayL;

             memset(&overlayL, 0 , sizeof (struct mdp_overlay));

             /* Fill OverlayL Data */
             overlayL.src.width  = ALIGN(gr_fb.width, 32);
             overlayL.src.height = gr_fb.height;
             overlayL.src.format = map_mdp_pixel_format();
             overlayL.src_rect.x = 0;
             overlayL.src_rect.y = 0;
             overlayL.src_rect.w = lCropWidth;
             overlayL.src_rect.h = gr_fb.height;
             overlayL.dst_rect.x = 0;
             overlayL.dst_rect.y = 0;
             overlayL.dst_rect.w = lWidth;
             overlayL.dst_rect.h = height;
             overlayL.alpha = 0xFF;
 #ifdef BOARD_HAS_FLIPPED_SCREEN
             overlayL.flags = MDP_ROT_180;
 #endif
             overlayL.transp_mask = MDP_TRANSP_NOP;
             overlayL.id = MSMFB_NEW_REQUEST;
             ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayL);
             if (ret < 0) {
                 perror("OverlayL Set Failed");
                 return ret;
             }
             overlayL_id = overlayL.id;
         }
         if (MSMFB_NEW_REQUEST == overlayR_id) {
             struct mdp_overlay overlayR;

             memset(&overlayR, 0 , sizeof (struct mdp_overlay));

             /* Fill OverlayR Data */
             overlayR.src.width  = ALIGN(gr_fb.width, 32);
             overlayR.src.height = gr_fb.height;
             overlayR.src.format = map_mdp_pixel_format();
             overlayR.src_rect.x = lCropWidth;
             overlayR.src_rect.y = 0;
             overlayR.src_rect.w = gr_fb.width - lCropWidth;
             overlayR.src_rect.h = gr_fb.height;
             overlayR.dst_rect.x = 0;
             overlayR.dst_rect.y = 0;
             overlayR.dst_rect.w = rWidth;
             overlayR.dst_rect.h = height;
             overlayR.alpha = 0xFF;
 #ifdef BOARD_HAS_FLIPPED_SCREEN
             overlayR.flags = MDSS_MDP_RIGHT_MIXER | MDP_ROT_180;
 #else
             overlayR.flags = MDSS_MDP_RIGHT_MIXER;
 #endif
             overlayR.transp_mask = MDP_TRANSP_NOP;
             overlayR.id = MSMFB_NEW_REQUEST;
             ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayR);
             if (ret < 0) {
                 perror("OverlayR Set Failed");
                 return ret;
             }
             overlayR_id = overlayR.id;
         }

     }
     return 0;
 }

 int overlay_display_frame(int fd, void* data, size_t size)
 {
     int ret = 0;
     struct msmfb_overlay_data ovdataL, ovdataR;
     struct mdp_display_commit ext_commit;

     if (!isDisplaySplit()) {
         if (overlayL_id == MSMFB_NEW_REQUEST) {
             perror("display_frame failed, no overlay\n");
             return -EINVAL;
         }

         memcpy(mem_info.mem_buf, data, size);

         memset(&ovdataL, 0, sizeof(struct msmfb_overlay_data));

         ovdataL.id = overlayL_id;
         ovdataL.data.flags = 0;
         ovdataL.data.offset = 0;
         ovdataL.data.memory_id = mem_info.mem_fd;
         ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataL);
         if (ret < 0) {
             perror("overlay_display_frame failed, overlay play Failed\n");
             printf("%i, %i, %i, %i\n", ret, fb_fd, fd, errno);
             return ret;
         }
     } else {

         if (overlayL_id == MSMFB_NEW_REQUEST) {
             perror("display_frame failed, no overlayL \n");
             return -EINVAL;
         }

         memcpy(mem_info.mem_buf, data, size);

         memset(&ovdataL, 0, sizeof(struct msmfb_overlay_data));

         ovdataL.id = overlayL_id;
         ovdataL.data.flags = 0;
         ovdataL.data.offset = 0;
         ovdataL.data.memory_id = mem_info.mem_fd;
         ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataL);
         if (ret < 0) {
             perror("overlay_display_frame failed, overlayL play Failed\n");
             return ret;
         }

         if (overlayR_id == MSMFB_NEW_REQUEST) {
             perror("display_frame failed, no overlayR \n");
             return -EINVAL;
         }
         memset(&ovdataR, 0, sizeof(struct msmfb_overlay_data));

         ovdataR.id = overlayR_id;
         ovdataR.data.flags = 0;
         ovdataR.data.offset = 0;
         ovdataR.data.memory_id = mem_info.mem_fd;
         ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataR);
         if (ret < 0) {
             perror("overlay_display_frame failed, overlayR play Failed\n");
             return ret;
         }
     }
     memset(&ext_commit, 0, sizeof(struct mdp_display_commit));
     ext_commit.flags = MDP_DISPLAY_COMMIT_OVERLAY;
     ext_commit.wait_for_finish = 1;
     ret = ioctl(fd, MSMFB_DISPLAY_COMMIT, &ext_commit);
     if (ret < 0) {
         perror("overlay_display_frame failed, overlay commit Failed\n!");
     }

     return ret;
 }

 static GRSurface* overlay_flip(minui_backend* backend __unused) {
 #if defined(RECOVERY_BGRA)
     // In case of BGRA, do some byte swapping
     unsigned char* ucfb_vaddr = (unsigned char*)gr_draw->data;
     for (int idx = 0 ; idx < (gr_draw->height * gr_draw->row_bytes);
             idx += 4) {
         unsigned char tmp = ucfb_vaddr[idx];
         ucfb_vaddr[idx    ] = ucfb_vaddr[idx + 2];
         ucfb_vaddr[idx + 2] = tmp;
     }
 #endif
     // Copy from the in-memory surface to the framebuffer.
     overlay_display_frame(fb_fd, gr_draw->data, frame_size);
     return gr_draw;
 }

 int free_overlay(int fd)
 {
     int ret = 0;
     struct mdp_display_commit ext_commit;

     if (!isDisplaySplit()) {
         if (overlayL_id != MSMFB_NEW_REQUEST) {
             ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayL_id);
             if (ret) {
                 perror("Overlay Unset Failed");
                 overlayL_id = MSMFB_NEW_REQUEST;
                 return ret;
             }
         }
     } else {

         if (overlayL_id != MSMFB_NEW_REQUEST) {
             ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayL_id);
             if (ret) {
                 perror("OverlayL Unset Failed");
             }
         }

         if (overlayR_id != MSMFB_NEW_REQUEST) {
             ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayR_id);
             if (ret) {
                 perror("OverlayR Unset Failed");
                 overlayR_id = MSMFB_NEW_REQUEST;
                 return ret;
             }
         }
     }
     memset(&ext_commit, 0, sizeof(struct mdp_display_commit));
     ext_commit.flags = MDP_DISPLAY_COMMIT_OVERLAY;
     ext_commit.wait_for_finish = 1;
     ret = ioctl(fd, MSMFB_DISPLAY_COMMIT, &ext_commit);
     if (ret < 0) {
         perror("ERROR: Clear MSMFB_DISPLAY_COMMIT failed!");
         overlayL_id = MSMFB_NEW_REQUEST;
         overlayR_id = MSMFB_NEW_REQUEST;
         return ret;
     }
     overlayL_id = MSMFB_NEW_REQUEST;
     overlayR_id = MSMFB_NEW_REQUEST;

     return 0;
 }

 static GRSurface* overlay_init(minui_backend* backend) {
     int fd = open("/dev/graphics/fb0", O_RDWR);
     if (fd == -1) {
         perror("cannot open fb0");
         return NULL;
     }

     fb_fix_screeninfo fi;
     if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
         perror("failed to get fb0 info");
         close(fd);
         return NULL;
     }

     if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
         perror("failed to get fb0 info");
         close(fd);
         return NULL;
     }

     // We print this out for informational purposes only, but
     // throughout we assume that the framebuffer device uses an RGBX
     // pixel format.  This is the case for every development device I
     // have access to.  For some of those devices (eg, hammerhead aka
     // Nexus 5), FBIOGET_VSCREENINFO *reports* that it wants a
     // different format (XBGR) but actually produces the correct
     // results on the display when you write RGBX.
     //
     // If you have a device that actually *needs* another pixel format
     // (ie, BGRX, or 565), patches welcome...

     printf("fb0 reports (possibly inaccurate):\n"
            "  vi.bits_per_pixel = %d\n"
            "  vi.red.offset   = %3d   .length = %3d\n"
            "  vi.green.offset = %3d   .length = %3d\n"
            "  vi.blue.offset  = %3d   .length = %3d\n",
            vi.bits_per_pixel,
            vi.red.offset, vi.red.length,
            vi.green.offset, vi.green.length,
            vi.blue.offset, vi.blue.length);

     gr_framebuffer.width = vi.xres;
     gr_framebuffer.height = vi.yres;
     gr_framebuffer.row_bytes = fi.line_length;
     gr_framebuffer.pixel_bytes = vi.bits_per_pixel / 8;
     //gr_framebuffer.data = reinterpret_cast<uint8_t*>(bits);
     if (vi.bits_per_pixel == 16) {
         printf("setting GGL_PIXEL_FORMAT_RGB_565\n");
         gr_framebuffer.format = GGL_PIXEL_FORMAT_RGB_565;
     } else if (vi.red.offset == 8 || vi.red.offset == 16) {
         printf("setting GGL_PIXEL_FORMAT_BGRA_8888\n");
         gr_framebuffer.format = GGL_PIXEL_FORMAT_BGRA_8888;
     } else if (vi.red.offset == 0) {
         printf("setting GGL_PIXEL_FORMAT_RGBA_8888\n");
         gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBA_8888;
     } else if (vi.red.offset == 24) {
         printf("setting GGL_PIXEL_FORMAT_RGBX_8888\n");
         gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBX_8888;
     } else {
         if (vi.red.length == 8) {
             printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGBX_8888\n");
             gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBX_8888;
         } else {
             printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGB_565\n");
             gr_framebuffer.format = GGL_PIXEL_FORMAT_RGB_565;
         }
     }

     frame_size = fi.line_length * vi.yres;

     gr_framebuffer.data = reinterpret_cast<uint8_t*>(calloc(frame_size, 1));
     if (gr_framebuffer.data == NULL) {
         perror("failed to calloc framebuffer");
         close(fd);
         return NULL;
     }

     gr_draw = &gr_framebuffer;
     fb_fd = fd;

     printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height);

     overlay_blank(backend, true);
     overlay_blank(backend, false);

     if (!alloc_ion_mem(frame_size))
         allocate_overlay(fb_fd, gr_framebuffer);

     return gr_draw;
 }

 static void overlay_exit(minui_backend* backend __unused) {
     free_overlay(fb_fd);
     free_ion_mem();

     close(fb_fd);
     fb_fd = -1;

     if (gr_draw) {
         free(gr_draw->data);
         free(gr_draw);
     }
     gr_draw = NULL;
 }
 #else // MSM_BSP
 static GRSurface* overlay_flip(minui_backend* backend __unused) {
     return NULL;
 }

 static GRSurface* overlay_init(minui_backend* backend __unused) {
     return NULL;
 }

 static void overlay_exit(minui_backend* backend __unused) {
     return;
 }
 #endif // MSM_BSP
	/*
	* Copyright (C) 2014 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 <stdbool.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <errno.h>

	#include <fcntl.h>
	#include <stdio.h>

	#include <sys/cdefs.h>
	#include <sys/ioctl.h>
	#include <sys/mman.h>
	#include <sys/types.h>

	#include <linux/fb.h>
	#include <linux/kd.h>

	#ifdef MSM_BSP
	#include <linux/msm_mdp.h>
	#include <linux/msm_ion.h>
	#endif

	#include "minui.h"
	#include "graphics.h"
	#include <pixelflinger/pixelflinger.h>

	#define MDP_V4_0 400
	#define MAX_DISPLAY_DIM 2048

	static GRSurface* overlay_init(minui_backend*);
	static GRSurface* overlay_flip(minui_backend*);
	static void overlay_blank(minui_backend*, bool);
	static void overlay_exit(minui_backend*);

	static GRSurface gr_framebuffer;
	static GRSurface* gr_draw = NULL;
	static int displayed_buffer;

	static fb_var_screeninfo vi;
	static int fb_fd = -1;
	static bool isMDP5 = false;
	static int leftSplit = 0;
	static int rightSplit = 0;
	#define ALIGN(x, align) (((x) + ((align)-1)) & ~((align)-1))

	static size_t frame_size = 0;

	#ifdef MSM_BSP
	typedef struct {
	unsigned char *mem_buf;
	int size;
	int ion_fd;
	int mem_fd;
	struct ion_handle_data handle_data;
	} memInfo;

	//Left and right overlay id
	static int overlayL_id = MSMFB_NEW_REQUEST;
	static int overlayR_id = MSMFB_NEW_REQUEST;

	static memInfo mem_info;

	static int map_mdp_pixel_format()
	{
	if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGB_565)
	return MDP_RGB_565;
	else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_BGRA_8888)
	return MDP_BGRA_8888;
	else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGBA_8888)
	return MDP_RGBA_8888;
	else if (gr_framebuffer.format == GGL_PIXEL_FORMAT_RGBX_8888)
	return MDP_RGBA_8888;
	printf("No known pixel format for map_mdp_pixel_format, defaulting to MDP_RGB_565.\n");
	return MDP_RGB_565;
	}
	#endif // MSM_BSP

	static minui_backend my_backend = {
	.init = overlay_init,
	.flip = overlay_flip,
	.blank = overlay_blank,
	.exit = overlay_exit,
	};

	bool target_has_overlay(char *version)
	{
	int ret;
	int mdp_version;
	bool overlay_supported = false;

	if (strlen(version) >= 8) {
	if(!strncmp(version, "msmfb", strlen("msmfb"))) {
	char str_ver[4];
	memcpy(str_ver, version + strlen("msmfb"), 3);
	str_ver[3] = '\0';
	mdp_version = atoi(str_ver);
	if (mdp_version >= MDP_V4_0) {
	overlay_supported = true;
	}
	} else if (!strncmp(version, "mdssfb", strlen("mdssfb"))) {
	overlay_supported = true;
	isMDP5 = true;
	}
	}

	return overlay_supported;
	}

	minui_backend* open_overlay() {
	fb_fix_screeninfo fi;
	int fd;

	fd = open("/dev/graphics/fb0", O_RDWR);
	if (fd < 0) {
	perror("open_overlay cannot open fb0");
	return NULL;
	}

	if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
	perror("failed to get fb0 info");
	close(fd);
	return NULL;
	}

	if (target_has_overlay(fi.id)) {
	#ifdef MSM_BSP
	close(fd);
	return &my_backend;
	#else
	printf("Overlay graphics may work (%s), but not enabled. Use TW_TARGET_USES_QCOM_BSP := true to enable.\n", fi.id);
	#endif
	}
	close(fd);
	return NULL;
	}

	static void overlay_blank(minui_backend* backend __unused, bool blank)
	{
	#if defined(TW_NO_SCREEN_BLANK) && defined(TW_BRIGHTNESS_PATH) && defined(TW_MAX_BRIGHTNESS)
	int fd;
	char brightness[4];
	snprintf(brightness, 4, "%03d", TW_MAX_BRIGHTNESS/2);

	fd = open(TW_BRIGHTNESS_PATH, O_RDWR);
	if (fd < 0) {
	perror("cannot open LCD backlight");
	return;
	}
	write(fd, blank ? "000" : brightness, 3);
	close(fd);

	#ifdef TW_SECONDARY_BRIGHTNESS_PATH
	fd = open(TW_SECONDARY_BRIGHTNESS_PATH, O_RDWR);
	if (fd < 0) {
	perror("cannot open LCD backlight 2");
	return;
	}
	write(fd, blank ? "000" : brightness, 3);
	close(fd);
	#endif
	#else
	int ret;

	ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
	if (ret < 0)
	perror("ioctl(): blank");
	#endif
	}

	#ifdef MSM_BSP
	void setDisplaySplit(void) {
	char split[64] = {0};
	if (!isMDP5)
	return;
	FILE* fp = fopen("/sys/class/graphics/fb0/msm_fb_split", "r");
	if (fp) {
	//Format "left right" space as delimiter
	if(fread(split, sizeof(char), 64, fp)) {
	leftSplit = atoi(split);
	printf("Left Split=%d\n",leftSplit);
	char *rght = strpbrk(split, " ");
	if (rght)
	rightSplit = atoi(rght + 1);
	printf("Right Split=%d\n", rightSplit);
	}
	} else {
	printf("Failed to open mdss_fb_split node\n");
	}
	if (fp)
	fclose(fp);
	}

	int getLeftSplit(void) {
	//Default even split for all displays with high res
	int lSplit = vi.xres / 2;

	//Override if split published by driver
	if (leftSplit)
	lSplit = leftSplit;

	return lSplit;
	}

	int getRightSplit(void) {
	return rightSplit;
	}

	int free_ion_mem(void) {
	int ret = 0;

	if (mem_info.mem_buf)
	munmap(mem_info.mem_buf, mem_info.size);

	if (mem_info.ion_fd >= 0) {
	ret = ioctl(mem_info.ion_fd, ION_IOC_FREE, &mem_info.handle_data);
	if (ret < 0)
	perror("free_mem failed ");
	}

	if (mem_info.mem_fd >= 0)
	close(mem_info.mem_fd);
	if (mem_info.ion_fd >= 0)
	close(mem_info.ion_fd);

	memset(&mem_info, 0, sizeof(mem_info));
	mem_info.mem_fd = -1;
	mem_info.ion_fd = -1;
	return 0;
	}

	int alloc_ion_mem(unsigned int size)
	{
	int result;
	struct ion_fd_data fd_data;
	struct ion_allocation_data ionAllocData;

	mem_info.ion_fd = open("/dev/ion", O_RDWR\|O_DSYNC);
	if (mem_info.ion_fd < 0) {
	perror("ERROR: Can't open ion ");
	return -errno;
	}

	ionAllocData.flags = 0;
	ionAllocData.len = size;
	ionAllocData.align = sysconf(_SC_PAGESIZE);
	#ifdef NEW_ION_HEAP
	ionAllocData.heap_id_mask =
	#else
	ionAllocData.heap_mask =
	#endif
	ION_HEAP(ION_IOMMU_HEAP_ID) \|
	ION_HEAP(ION_SYSTEM_CONTIG_HEAP_ID);

	result = ioctl(mem_info.ion_fd, ION_IOC_ALLOC, &ionAllocData);
	if(result){
	perror("ION_IOC_ALLOC Failed ");
	close(mem_info.ion_fd);
	return result;
	}

	fd_data.handle = ionAllocData.handle;
	mem_info.handle_data.handle = ionAllocData.handle;
	result = ioctl(mem_info.ion_fd, ION_IOC_MAP, &fd_data);
	if (result) {
	perror("ION_IOC_MAP Failed ");
	free_ion_mem();
	return result;
	}
	mem_info.mem_buf = (unsigned char *)mmap(NULL, size, PROT_READ \|
	PROT_WRITE, MAP_SHARED, fd_data.fd, 0);
	mem_info.mem_fd = fd_data.fd;

	if (!mem_info.mem_buf) {
	perror("ERROR: mem_buf MAP_FAILED ");
	free_ion_mem();
	return -ENOMEM;
	}

	return 0;
	}

	bool isDisplaySplit(void) {
	if (vi.xres > MAX_DISPLAY_DIM)
	return true;
	//check if right split is set by driver
	if (getRightSplit())
	return true;

	return false;
	}

	int allocate_overlay(int fd, GRSurface gr_fb)
	{
	int ret = 0;

	if (!isDisplaySplit()) {
	// Check if overlay is already allocated
	if (MSMFB_NEW_REQUEST == overlayL_id) {
	struct mdp_overlay overlayL;

	memset(&overlayL, 0 , sizeof (struct mdp_overlay));

	/* Fill Overlay Data */
	overlayL.src.width = ALIGN(gr_fb.width, 32);
	overlayL.src.height = gr_fb.height;
	overlayL.src.format = map_mdp_pixel_format();
	overlayL.src_rect.w = gr_fb.width;
	overlayL.src_rect.h = gr_fb.height;
	overlayL.dst_rect.w = gr_fb.width;
	overlayL.dst_rect.h = gr_fb.height;
	overlayL.alpha = 0xFF;
	#ifdef BOARD_HAS_FLIPPED_SCREEN
	overlayL.flags = MDP_ROT_180;
	#endif
	overlayL.transp_mask = MDP_TRANSP_NOP;
	overlayL.id = MSMFB_NEW_REQUEST;
	ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayL);
	if (ret < 0) {
	perror("Overlay Set Failed");
	return ret;
	}
	overlayL_id = overlayL.id;
	}
	} else {
	float xres = vi.xres;
	int lSplit = getLeftSplit();
	float lSplitRatio = lSplit / xres;
	float lCropWidth = gr_fb.width * lSplitRatio;
	int lWidth = lSplit;
	int rWidth = gr_fb.width - lSplit;
	int height = gr_fb.height;

	if (MSMFB_NEW_REQUEST == overlayL_id) {

	struct mdp_overlay overlayL;

	memset(&overlayL, 0 , sizeof (struct mdp_overlay));

	/* Fill OverlayL Data */
	overlayL.src.width = ALIGN(gr_fb.width, 32);
	overlayL.src.height = gr_fb.height;
	overlayL.src.format = map_mdp_pixel_format();
	overlayL.src_rect.x = 0;
	overlayL.src_rect.y = 0;
	overlayL.src_rect.w = lCropWidth;
	overlayL.src_rect.h = gr_fb.height;
	overlayL.dst_rect.x = 0;
	overlayL.dst_rect.y = 0;
	overlayL.dst_rect.w = lWidth;
	overlayL.dst_rect.h = height;
	overlayL.alpha = 0xFF;
	#ifdef BOARD_HAS_FLIPPED_SCREEN
	overlayL.flags = MDP_ROT_180;
	#endif
	overlayL.transp_mask = MDP_TRANSP_NOP;
	overlayL.id = MSMFB_NEW_REQUEST;
	ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayL);
	if (ret < 0) {
	perror("OverlayL Set Failed");
	return ret;
	}
	overlayL_id = overlayL.id;
	}
	if (MSMFB_NEW_REQUEST == overlayR_id) {
	struct mdp_overlay overlayR;

	memset(&overlayR, 0 , sizeof (struct mdp_overlay));

	/* Fill OverlayR Data */
	overlayR.src.width = ALIGN(gr_fb.width, 32);
	overlayR.src.height = gr_fb.height;
	overlayR.src.format = map_mdp_pixel_format();
	overlayR.src_rect.x = lCropWidth;
	overlayR.src_rect.y = 0;
	overlayR.src_rect.w = gr_fb.width - lCropWidth;
	overlayR.src_rect.h = gr_fb.height;
	overlayR.dst_rect.x = 0;
	overlayR.dst_rect.y = 0;
	overlayR.dst_rect.w = rWidth;
	overlayR.dst_rect.h = height;
	overlayR.alpha = 0xFF;
	#ifdef BOARD_HAS_FLIPPED_SCREEN
	overlayR.flags = MDSS_MDP_RIGHT_MIXER \| MDP_ROT_180;
	#else
	overlayR.flags = MDSS_MDP_RIGHT_MIXER;
	#endif
	overlayR.transp_mask = MDP_TRANSP_NOP;
	overlayR.id = MSMFB_NEW_REQUEST;
	ret = ioctl(fd, MSMFB_OVERLAY_SET, &overlayR);
	if (ret < 0) {
	perror("OverlayR Set Failed");
	return ret;
	}
	overlayR_id = overlayR.id;
	}

	}
	return 0;
	}

	int overlay_display_frame(int fd, void* data, size_t size)
	{
	int ret = 0;
	struct msmfb_overlay_data ovdataL, ovdataR;
	struct mdp_display_commit ext_commit;

	if (!isDisplaySplit()) {
	if (overlayL_id == MSMFB_NEW_REQUEST) {
	perror("display_frame failed, no overlay\n");
	return -EINVAL;
	}

	memcpy(mem_info.mem_buf, data, size);

	memset(&ovdataL, 0, sizeof(struct msmfb_overlay_data));

	ovdataL.id = overlayL_id;
	ovdataL.data.flags = 0;
	ovdataL.data.offset = 0;
	ovdataL.data.memory_id = mem_info.mem_fd;
	ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataL);
	if (ret < 0) {
	perror("overlay_display_frame failed, overlay play Failed\n");
	printf("%i, %i, %i, %i\n", ret, fb_fd, fd, errno);
	return ret;
	}
	} else {

	if (overlayL_id == MSMFB_NEW_REQUEST) {
	perror("display_frame failed, no overlayL \n");
	return -EINVAL;
	}

	memcpy(mem_info.mem_buf, data, size);

	memset(&ovdataL, 0, sizeof(struct msmfb_overlay_data));

	ovdataL.id = overlayL_id;
	ovdataL.data.flags = 0;
	ovdataL.data.offset = 0;
	ovdataL.data.memory_id = mem_info.mem_fd;
	ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataL);
	if (ret < 0) {
	perror("overlay_display_frame failed, overlayL play Failed\n");
	return ret;
	}

	if (overlayR_id == MSMFB_NEW_REQUEST) {
	perror("display_frame failed, no overlayR \n");
	return -EINVAL;
	}
	memset(&ovdataR, 0, sizeof(struct msmfb_overlay_data));

	ovdataR.id = overlayR_id;
	ovdataR.data.flags = 0;
	ovdataR.data.offset = 0;
	ovdataR.data.memory_id = mem_info.mem_fd;
	ret = ioctl(fd, MSMFB_OVERLAY_PLAY, &ovdataR);
	if (ret < 0) {
	perror("overlay_display_frame failed, overlayR play Failed\n");
	return ret;
	}
	}
	memset(&ext_commit, 0, sizeof(struct mdp_display_commit));
	ext_commit.flags = MDP_DISPLAY_COMMIT_OVERLAY;
	ext_commit.wait_for_finish = 1;
	ret = ioctl(fd, MSMFB_DISPLAY_COMMIT, &ext_commit);
	if (ret < 0) {
	perror("overlay_display_frame failed, overlay commit Failed\n!");
	}

	return ret;
	}

	static GRSurface* overlay_flip(minui_backend* backend __unused) {
	#if defined(RECOVERY_BGRA)
	// In case of BGRA, do some byte swapping
	unsigned char* ucfb_vaddr = (unsigned char*)gr_draw->data;
	for (int idx = 0 ; idx < (gr_draw->height * gr_draw->row_bytes);
	idx += 4) {
	unsigned char tmp = ucfb_vaddr[idx];
	ucfb_vaddr[idx ] = ucfb_vaddr[idx + 2];
	ucfb_vaddr[idx + 2] = tmp;
	}
	#endif
	// Copy from the in-memory surface to the framebuffer.
	overlay_display_frame(fb_fd, gr_draw->data, frame_size);
	return gr_draw;
	}

	int free_overlay(int fd)
	{
	int ret = 0;
	struct mdp_display_commit ext_commit;

	if (!isDisplaySplit()) {
	if (overlayL_id != MSMFB_NEW_REQUEST) {
	ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayL_id);
	if (ret) {
	perror("Overlay Unset Failed");
	overlayL_id = MSMFB_NEW_REQUEST;
	return ret;
	}
	}
	} else {

	if (overlayL_id != MSMFB_NEW_REQUEST) {
	ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayL_id);
	if (ret) {
	perror("OverlayL Unset Failed");
	}
	}

	if (overlayR_id != MSMFB_NEW_REQUEST) {
	ret = ioctl(fd, MSMFB_OVERLAY_UNSET, &overlayR_id);
	if (ret) {
	perror("OverlayR Unset Failed");
	overlayR_id = MSMFB_NEW_REQUEST;
	return ret;
	}
	}
	}
	memset(&ext_commit, 0, sizeof(struct mdp_display_commit));
	ext_commit.flags = MDP_DISPLAY_COMMIT_OVERLAY;
	ext_commit.wait_for_finish = 1;
	ret = ioctl(fd, MSMFB_DISPLAY_COMMIT, &ext_commit);
	if (ret < 0) {
	perror("ERROR: Clear MSMFB_DISPLAY_COMMIT failed!");
	overlayL_id = MSMFB_NEW_REQUEST;
	overlayR_id = MSMFB_NEW_REQUEST;
	return ret;
	}
	overlayL_id = MSMFB_NEW_REQUEST;
	overlayR_id = MSMFB_NEW_REQUEST;

	return 0;
	}

	static GRSurface* overlay_init(minui_backend* backend) {
	int fd = open("/dev/graphics/fb0", O_RDWR);
	if (fd == -1) {
	perror("cannot open fb0");
	return NULL;
	}

	fb_fix_screeninfo fi;
	if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
	perror("failed to get fb0 info");
	close(fd);
	return NULL;
	}

	if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
	perror("failed to get fb0 info");
	close(fd);
	return NULL;
	}

	// We print this out for informational purposes only, but
	// throughout we assume that the framebuffer device uses an RGBX
	// pixel format. This is the case for every development device I
	// have access to. For some of those devices (eg, hammerhead aka
	// Nexus 5), FBIOGET_VSCREENINFO reports that it wants a
	// different format (XBGR) but actually produces the correct
	// results on the display when you write RGBX.
	//
	// If you have a device that actually needs another pixel format
	// (ie, BGRX, or 565), patches welcome...

	printf("fb0 reports (possibly inaccurate):\n"
	" vi.bits_per_pixel = %d\n"
	" vi.red.offset = %3d .length = %3d\n"
	" vi.green.offset = %3d .length = %3d\n"
	" vi.blue.offset = %3d .length = %3d\n",
	vi.bits_per_pixel,
	vi.red.offset, vi.red.length,
	vi.green.offset, vi.green.length,
	vi.blue.offset, vi.blue.length);

	gr_framebuffer.width = vi.xres;
	gr_framebuffer.height = vi.yres;
	gr_framebuffer.row_bytes = fi.line_length;
	gr_framebuffer.pixel_bytes = vi.bits_per_pixel / 8;
	//gr_framebuffer.data = reinterpret_cast<uint8_t*>(bits);
	if (vi.bits_per_pixel == 16) {
	printf("setting GGL_PIXEL_FORMAT_RGB_565\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_RGB_565;
	} else if (vi.red.offset == 8 \|\| vi.red.offset == 16) {
	printf("setting GGL_PIXEL_FORMAT_BGRA_8888\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_BGRA_8888;
	} else if (vi.red.offset == 0) {
	printf("setting GGL_PIXEL_FORMAT_RGBA_8888\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBA_8888;
	} else if (vi.red.offset == 24) {
	printf("setting GGL_PIXEL_FORMAT_RGBX_8888\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBX_8888;
	} else {
	if (vi.red.length == 8) {
	printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGBX_8888\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_RGBX_8888;
	} else {
	printf("No valid pixel format detected, trying GGL_PIXEL_FORMAT_RGB_565\n");
	gr_framebuffer.format = GGL_PIXEL_FORMAT_RGB_565;
	}
	}

	frame_size = fi.line_length * vi.yres;

	gr_framebuffer.data = reinterpret_cast<uint8_t*>(calloc(frame_size, 1));
	if (gr_framebuffer.data == NULL) {
	perror("failed to calloc framebuffer");
	close(fd);
	return NULL;
	}

	gr_draw = &gr_framebuffer;
	fb_fd = fd;

	printf("framebuffer: %d (%d x %d)\n", fb_fd, gr_draw->width, gr_draw->height);

	overlay_blank(backend, true);
	overlay_blank(backend, false);

	if (!alloc_ion_mem(frame_size))
	allocate_overlay(fb_fd, gr_framebuffer);

	return gr_draw;
	}

	static void overlay_exit(minui_backend* backend __unused) {
	free_overlay(fb_fd);
	free_ion_mem();

	close(fb_fd);
	fb_fd = -1;

	if (gr_draw) {
	free(gr_draw->data);
	free(gr_draw);
	}
	gr_draw = NULL;
	}
	#else // MSM_BSP
	static GRSurface* overlay_flip(minui_backend* backend __unused) {
	return NULL;
	}

	static GRSurface* overlay_init(minui_backend* backend __unused) {
	return NULL;
	}

	static void overlay_exit(minui_backend* backend __unused) {
	return;
	}
	#endif // MSM_BSP