5 files changed, 845 insertions, 4 deletions

diff --git a/minui/Android.mk b/minui/Android.mk
index d50bf1048..f2170255d 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -4,10 +4,12 @@ include $(CLEAR_VARS)
 LOCAL_SRC_FILES := \
     events.cpp \
     graphics.cpp \
-    graphics_adf.cpp \
     graphics_drm.cpp \
     graphics_fbdev.cpp \
     resources.cpp \
+    graphics_overlay.cpp
+
+LOCAL_C_INCLUDES := external/libcxx/include external/libpng
 
 ifeq ($(TW_TARGET_USES_QCOM_BSP), true)
   LOCAL_CFLAGS += -DMSM_BSP
@@ -23,13 +25,16 @@ ifeq ($(TW_TARGET_USES_QCOM_BSP), true)
   endif
 else
   LOCAL_C_INCLUDES += $(commands_recovery_local_path)/minui/include
+  # The header files required for adf graphics can cause compile errors
+  # with adf graphics.
+  LOCAL_SRC_FILES += graphics_adf.cpp
+  LOCAL_WHOLE_STATIC_LIBRARIES += libadf
 endif
 
 ifeq ($(TW_NEW_ION_HEAP), true)
   LOCAL_CFLAGS += -DNEW_ION_HEAP
 endif
 
-LOCAL_WHOLE_STATIC_LIBRARIES += libadf
 LOCAL_WHOLE_STATIC_LIBRARIES += libdrm
 LOCAL_STATIC_LIBRARIES += libpng
 
@@ -77,3 +82,13 @@ LOCAL_MODULE := libminui
 LOCAL_WHOLE_STATIC_LIBRARIES += libminui
 LOCAL_SHARED_LIBRARIES := libpng
 include $(BUILD_SHARED_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := minuitest
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
+LOCAL_SRC_FILES := main.cpp
+LOCAL_STATIC_LIBRARIES := libbinder libminui libpng libz libutils libstdc++ libcutils liblog libm libc
+LOCAL_C_INCLUDES := external/libcxx/include external/libpng
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+include $(BUILD_EXECUTABLE)
diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index 4c7dd3f5c..76ef56e70 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -470,18 +470,37 @@ void gr_flip() {
 int gr_init(void)
 {
     gr_init_font();
+    gr_draw = NULL;
 
-    gr_backend = open_adf();
+    gr_backend = open_overlay();
     if (gr_backend) {
         gr_draw = gr_backend->init(gr_backend);
         if (!gr_draw) {
             gr_backend->exit(gr_backend);
+        } else
+            printf("Using overlay graphics.\n");
+    }
+
+#ifndef MSM_BSP
+    if (!gr_draw) {
+        gr_backend = open_adf();
+        if (gr_backend) {
+            gr_draw = gr_backend->init(gr_backend);
+            if (!gr_draw) {
+                gr_backend->exit(gr_backend);
+            } else
+                printf("Using adf graphics.\n");
         }
     }
+#else
+	printf("Skipping adf graphics because TW_TARGET_USES_QCOM_BSP := true\n");
+#endif
 
     if (!gr_draw) {
         gr_backend = open_drm();
         gr_draw = gr_backend->init(gr_backend);
+        if (gr_draw)
+            printf("Using drm graphics.\n");
     }
 
     if (!gr_draw) {
@@ -489,7 +508,8 @@ int gr_init(void)
         gr_draw = gr_backend->init(gr_backend);
         if (gr_draw == NULL) {
             return -1;
-        }
+        } else
+            printf("Using fbdev graphics.\n");
     }
 
     overscan_offset_x = gr_draw->width * overscan_percent / 100;
diff --git a/minui/graphics.h b/minui/graphics.h
index 52968eb10..a4115fd50 100644
--- a/minui/graphics.h
+++ b/minui/graphics.h
@@ -39,5 +39,6 @@ struct minui_backend {
 minui_backend* open_fbdev();
 minui_backend* open_adf();
 minui_backend* open_drm();
+minui_backend* open_overlay();
 
 #endif
diff --git a/minui/graphics_overlay.cpp b/minui/graphics_overlay.cpp
new file mode 100644
index 000000000..2ba452a0e
--- /dev/null
+++ b/minui/graphics_overlay.cpp
@@ -0,0 +1,692 @@
+/*
+ * 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"
+
+#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[2];
+static bool double_buffered;
+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()
+{
+    int format = MDP_RGB_565;
+#if defined(RECOVERY_BGRA)
+    format = MDP_BGRA_8888;
+#elif defined(RECOVERY_RGBX)
+    format = MDP_RGBA_8888;
+#endif
+    return format;
+}
+#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);
+#else
+    int ret;
+
+    ret = ioctl(fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
+    if (ret < 0)
+        perror("ioctl(): blank");
+#endif
+}
+
+static void set_displayed_framebuffer(unsigned n)
+{
+    if (n > 1 || !double_buffered) return;
+
+    vi.yres_virtual = gr_framebuffer[0].height * 2;
+    vi.yoffset = n * gr_framebuffer[0].height;
+    vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8;
+    if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
+        perror("active fb swap failed");
+    }
+    displayed_buffer = n;
+}
+
+#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[0].width, 32);
+            overlayL.src.height = gr_fb[0].height;
+            overlayL.src.format = map_mdp_pixel_format();
+            overlayL.src_rect.w = gr_fb[0].width;
+            overlayL.src_rect.h = gr_fb[0].height;
+            overlayL.dst_rect.w = gr_fb[0].width;
+            overlayL.dst_rect.h = gr_fb[0].height;
+            overlayL.alpha = 0xFF;
+            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[0].width * lSplitRatio;
+        int lWidth = lSplit;
+        int rWidth = gr_fb[0].width - lSplit;
+        int height = gr_fb[0].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[0].width, 32);
+            overlayL.src.height = gr_fb[0].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[0].height;
+            overlayL.dst_rect.x = 0;
+            overlayL.dst_rect.y = 0;
+            overlayL.dst_rect.w = lWidth;
+            overlayL.dst_rect.h = height;
+            overlayL.alpha = 0xFF;
+            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[0].width, 32);
+            overlayR.src.height = gr_fb[0].height;
+            overlayR.src.format = map_mdp_pixel_format();
+            overlayR.src_rect.x = lCropWidth;
+            overlayR.src_rect.y = 0;
+            overlayR.src_rect.w = gr_fb[0].width - lCropWidth;
+            overlayR.src_rect.h = gr_fb[0].height;
+            overlayR.dst_rect.x = 0;
+            overlayR.dst_rect.y = 0;
+            overlayR.dst_rect.w = rWidth;
+            overlayR.dst_rect.h = height;
+            overlayR.alpha = 0xFF;
+            overlayR.flags = MDSS_MDP_RIGHT_MIXER;
+            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");
+            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 (double_buffered) {
+#if defined(RECOVERY_BGRA)
+        // In case of BGRA, do some byte swapping
+        unsigned int idx;
+        unsigned char tmp;
+        unsigned char* ucfb_vaddr = (unsigned char*)gr_draw->data;
+        for (idx = 0 ; idx < (gr_draw->height * gr_draw->row_bytes);
+                idx += 4) {
+            tmp = ucfb_vaddr[idx];
+            ucfb_vaddr[idx    ] = ucfb_vaddr[idx + 2];
+            ucfb_vaddr[idx + 2] = tmp;
+        }
+#endif
+        // Change gr_draw to point to the buffer currently displayed,
+        // then flip the driver so we're displaying the other buffer
+        // instead.
+        gr_draw = gr_framebuffer + displayed_buffer;
+        set_displayed_framebuffer(1-displayed_buffer);
+        overlay_display_frame(fb_fd, gr_draw->data, frame_size);
+    } else {
+        // 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");
+                overlayL_id = MSMFB_NEW_REQUEST;
+                return ret;
+            }
+        }
+
+        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);
+
+    void* bits = malloc(vi.xres_virtual * vi.yres * (vi.bits_per_pixel / 8));
+    if (bits == NULL) {
+        perror("failed to malloc framebuffer");
+        close(fd);
+        return NULL;
+    }
+
+    memset(bits, 0, fi.smem_len);
+
+    gr_framebuffer[0].width = vi.xres;
+    gr_framebuffer[0].height = vi.yres;
+    gr_framebuffer[0].row_bytes = fi.line_length;
+    gr_framebuffer[0].pixel_bytes = vi.bits_per_pixel / 8;
+    gr_framebuffer[0].data = reinterpret_cast<uint8_t*>(bits);
+    memset(gr_framebuffer[0].data, 0, gr_framebuffer[0].height * gr_framebuffer[0].row_bytes);
+
+    /* check if we can use double buffering */
+    if (vi.yres * fi.line_length * 2 <= fi.smem_len) {
+        double_buffered = true;
+        printf("double buffered.\n");
+        memcpy(gr_framebuffer+1, gr_framebuffer, sizeof(GRSurface));
+        gr_framebuffer[1].data = gr_framebuffer[0].data +
+            gr_framebuffer[0].height * gr_framebuffer[0].row_bytes;
+
+        gr_draw = gr_framebuffer+1;
+
+    } else {
+        double_buffered = false;
+        printf("single buffered.\n");
+        // Without double-buffering, we allocate RAM for a buffer to
+        // draw in, and then "flipping" the buffer consists of a
+        // memcpy from the buffer we allocated to the framebuffer.
+
+        gr_draw = (GRSurface*) malloc(sizeof(GRSurface));
+        if (gr_draw == NULL) {
+            printf("Failed to malloc gr_draw for single buffering.\n");
+            return NULL;
+        } else {
+            memcpy(gr_draw, gr_framebuffer, sizeof(GRSurface));
+            gr_draw->data = (unsigned char*) malloc(gr_draw->height * gr_draw->row_bytes);
+            if (!gr_draw->data) {
+                perror("failed to allocate in-memory surface");
+                return NULL;
+            }
+        }
+    }
+
+    memset(gr_draw->data, 0, gr_draw->height * gr_draw->row_bytes);
+    fb_fd = fd;
+    set_displayed_framebuffer(0);
+
+    frame_size = fi.line_length * vi.yres;
+
+    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(fi.line_length * vi.yres))
+        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 (!double_buffered && gr_draw) {
+        free(gr_draw->data);
+        free(gr_draw);
+    }
+    gr_draw = NULL;
+    if (gr_framebuffer[0].data) {
+        free(gr_framebuffer[0].data);
+        gr_framebuffer[0].data = 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
diff --git a/minui/main.cpp b/minui/main.cpp
new file mode 100644
index 000000000..74b830e39
--- /dev/null
+++ b/minui/main.cpp
@@ -0,0 +1,113 @@
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <linux/fb.h>
+#include <linux/kd.h>
+
+#include <time.h>
+
+#include "minui.h"
+#include "graphics.h"
+
+int main() {
+	// It might be a good idea to add some blending tests.
+	// The only blending done currently is around the font / text
+	int i = 0;
+    printf("Initializing graphics.\n");
+	if (gr_init() != 0) {
+	    printf("Error initializing graphics.\n");
+	    return -1;
+	}
+	printf("Starting tests\n");
+	printf("Red\n");
+	gr_color(255, 0, 0, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(1);
+	printf("Green\n");
+	gr_color(0, 225, 0, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(1);
+	printf("Blue\n");
+	gr_color(0, 0, 255, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(1);
+	printf("White\n");
+	gr_color(255, 255, 255, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(1);
+	printf("4 colors, 1 in each corner\n");
+	gr_color(255, 0, 0, 255);
+	gr_fill(0, 0, gr_fb_width() / 2, gr_fb_height() / 2);
+	gr_color(0, 255, 0, 255);
+	gr_fill(0, gr_fb_height() / 2, gr_fb_width() / 2, gr_fb_height());
+	gr_color(0, 0, 255, 255);
+	gr_fill(gr_fb_width() / 2, 0, gr_fb_width(), gr_fb_height() / 2);
+	gr_color(255, 255, 255, 255);
+	gr_fill(gr_fb_width() / 2, gr_fb_height() / 2, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(3);
+	printf("4 colors, vertical stripes\n");
+	gr_color(255, 0, 0, 255);
+	gr_fill(0, 0, gr_fb_width() / 4, gr_fb_height());
+	gr_color(0, 255, 0, 255);
+	gr_fill(gr_fb_width() / 4, 0, gr_fb_width() / 2, gr_fb_height());
+	gr_color(0, 0, 255, 255);
+	gr_fill(gr_fb_width() / 2, 0, gr_fb_width() * 3 / 4, gr_fb_height());
+	gr_color(255, 255, 255, 255);
+	gr_fill(gr_fb_width() * 3 / 4, 0, gr_fb_width(), gr_fb_height());
+	gr_flip();
+	sleep(3);
+	printf("Gradients, 1 in each corner\n");
+	gr_color(0, 0, 0, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	for (i = 0; i < 255; i++) {
+		gr_color(i, 0, 0, 255);
+		gr_fill(i, 0, i+1, gr_fb_height() / 2);
+		gr_color(0, i, 0, 255);
+		gr_fill(i, gr_fb_height() / 2, i+1, gr_fb_height());
+		gr_color(0, 0, i, 255);
+		gr_fill(i + (gr_fb_width() / 2), 0, i + (gr_fb_width() / 2) + 1, gr_fb_height() / 2);
+		gr_color(i, i, i, 255);
+		gr_fill(i + (gr_fb_width() / 2), gr_fb_height() / 2, i + (gr_fb_width() / 2) + 1, gr_fb_height());
+	}
+	gr_flip();
+	sleep(3);
+	printf("White with RGB text\n");
+	gr_color(255, 255, 255, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	gr_color(255, 0, 0, 255);
+	gr_text(10, 10, "RED red RED", false);
+	gr_color(0, 255, 0, 255);
+	gr_text(10, 50, "GREEN green GREEN", false);
+	gr_color(0, 0, 255, 255);
+	gr_text(10, 90, "BLUE blue BLUE", false);
+	gr_flip();
+	sleep(3);
+	printf("PNG test with /res/images/test.png\n");
+	GRSurface* icon[2];
+	gr_color(0, 0, 0, 255);
+	gr_fill(0, 0, gr_fb_width(), gr_fb_height());
+	res_create_display_surface("test", icon);
+	GRSurface* surface = icon[0];
+	gr_blit(surface, 0, 0, gr_get_width(surface), gr_get_height(surface), 10, 10);
+	gr_flip();
+	res_free_surface(surface);
+	sleep(3);
+	printf("Exit graphics.\n");
+	gr_exit();
+	printf("Done.\n");
+	return 0;
+}