a test to measure the touch latency

Change-Id: I01782274563fc9d6e4c1ba48e5aa371c164ed589

2 files changed, 308 insertions, 0 deletions

diff --git a/tests/touchlag/Android.mk b/tests/touchlag/Android.mk
new file mode 100644
index 0000000..4f8aa1e
--- /dev/null
+++ b/tests/touchlag/Android.mk
@@ -0,0 +1,14 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	touchlag.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils libutils \
+
+LOCAL_MODULE:= test-touchlag
+
+LOCAL_MODULE_TAGS := tests
+
+include $(BUILD_EXECUTABLE)
diff --git a/tests/touchlag/touchlag.cpp b/tests/touchlag/touchlag.cpp
new file mode 100644
index 0000000..df4befb
--- /dev/null
+++ b/tests/touchlag/touchlag.cpp
@@ -0,0 +1,294 @@
+/*
+ * Copyright (C) 2012 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 <stdint.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/fb.h>
+#include <linux/input.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <cutils/memory.h>
+#include <asm-generic/mman.h>
+#include <sys/mman.h>
+#include <utils/threads.h>
+#include <unistd.h>
+#include <math.h>
+
+using namespace android;
+
+#ifndef FBIO_WAITFORVSYNC
+#define FBIO_WAITFORVSYNC   _IOW('F', 0x20, __u32)
+#endif
+
+struct Buffer {
+    size_t w;
+    size_t h;
+    size_t s;
+    union {
+        void* addr;
+        uint32_t* pixels;
+    };
+};
+
+void clearBuffer(Buffer* buf, uint32_t pixel) {
+    android_memset32(buf->pixels, pixel, buf->s * buf->h * 4);
+}
+
+void drawTwoPixels(Buffer* buf, uint32_t pixel, ssize_t x, ssize_t y, size_t w) {
+    if (y>0 && y<ssize_t(buf->h)) {
+        uint32_t* bits = buf->pixels + y * buf->s;
+        if (x>=0 && x<buf->w) {
+            bits[x] = pixel;
+        }
+        ssize_t W(w);
+        if ((x+W)>=0 && (x+W)<buf->w) {
+            bits[x+W] = pixel;
+        }
+    }
+}
+
+void drawHLine(Buffer* buf, uint32_t pixel, ssize_t x, ssize_t y, size_t w) {
+    if (y>0 && y<ssize_t(buf->h)) {
+        ssize_t W(w);
+        if (x<0) {
+            W += x;
+            x = 0;
+        }
+        if (x+w > buf->w) {
+            W = buf->w - x;
+        }
+        if (W>0) {
+            uint32_t* bits = buf->pixels + y * buf->s + x;
+            android_memset32(bits, pixel, W*4);
+        }
+    }
+}
+
+void drawRect(Buffer* buf, uint32_t pixel, ssize_t x, ssize_t y, size_t w, size_t h) {
+    ssize_t W(w), H(h);
+    if (x<0) {
+        w += x;
+        x = 0;
+    }
+    if (y<0) {
+        h += y;
+        y = 0;
+    }
+    if (x+w > buf->w)   W = buf->w - x;
+    if (y+h > buf->h)   H = buf->h - y;
+    if (W>0 && H>0) {
+        uint32_t* bits = buf->pixels + y * buf->s + x;
+        for (ssize_t i=0 ; i<H ; i++) {
+            android_memset32(bits, pixel, W*4);
+            bits += buf->s;
+        }
+    }
+}
+
+void drawCircle(Buffer* buf, uint32_t pixel,
+        size_t x0, size_t y0, size_t radius, bool filled = false) {
+    ssize_t f = 1 - radius;
+    ssize_t ddF_x = 1;
+    ssize_t ddF_y = -2 * radius;
+    ssize_t x = 0;
+    ssize_t y = radius;
+    if (filled) {
+        drawHLine(buf, pixel, x0-radius, y0, 2*radius);
+    } else {
+        drawTwoPixels(buf, pixel, x0-radius, y0, 2*radius);
+    }
+    while (x < y) {
+        if (f >= 0) {
+            y--;
+            ddF_y += 2;
+            f += ddF_y;
+        }
+        x++;
+        ddF_x += 2;
+        f += ddF_x;
+        if (filled) {
+            drawHLine(buf, pixel, x0-x, y0+y, 2*x);
+            drawHLine(buf, pixel, x0-x, y0-y, 2*x);
+            drawHLine(buf, pixel, x0-y, y0+x, 2*y);
+            drawHLine(buf, pixel, x0-y, y0-x, 2*y);
+        } else {
+            drawTwoPixels(buf, pixel, x0-x, y0+y, 2*x);
+            drawTwoPixels(buf, pixel, x0-x, y0-y, 2*x);
+            drawTwoPixels(buf, pixel, x0-y, y0+x, 2*y);
+            drawTwoPixels(buf, pixel, x0-y, y0-x, 2*y);
+        }
+    }
+}
+
+class TouchEvents {
+    class EventThread : public Thread {
+        int fd;
+
+        virtual bool threadLoop() {
+            input_event event;
+            int first_down = 0;
+            do {
+                read(fd, &event, sizeof(event));
+                if (event.type == EV_ABS) {
+                    if (event.code == ABS_MT_TRACKING_ID) {
+                        down = event.value == -1 ? 0 : 1;
+                        first_down = down;
+                    }
+                    if (event.code == ABS_MT_POSITION_X) {
+                        x = event.value;
+                    }
+                    if (event.code == ABS_MT_POSITION_Y) {
+                        y = event.value;
+                    }
+                }
+            } while (event.type == EV_SYN);
+            return true;
+        }
+
+    public:
+        int x, y, down;
+        EventThread() : Thread(false),
+                x(0), y(0), down(0)
+        {
+            fd = open("/dev/input/event1", O_RDONLY);
+        }
+};
+    sp<EventThread> thread;
+
+public:
+    TouchEvents() {
+        thread = new EventThread();
+        thread->run("EventThread", PRIORITY_URGENT_DISPLAY);
+    }
+
+    int getMostRecentPosition(int* x, int* y) {
+        *x = thread->x;
+        *y = thread->y;
+        return thread->down;
+    }
+};
+
+
+struct Queue {
+    struct position {
+        int x, y;
+    };
+    int index;
+    position q[16];
+    Queue() : index(0) { }
+    void push(int x, int y) {
+        index++;
+        index &= 0xF;
+        q[index].x = x;
+        q[index].y = y;
+    }
+    void get(int lag, int* x, int* y) {
+        const int i = (index - lag) & 0xF;
+        *x = q[i].x;
+        *y = q[i].y;
+    }
+};
+
+extern char *optarg;
+extern int optind;
+extern int optopt;
+extern int opterr;
+extern int optreset;
+
+void usage(const char* name) {
+    printf("\nusage: %s [-h] [-l lag]\n", name);
+}
+
+int main(int argc, char** argv) {
+    fb_var_screeninfo vi;
+    fb_fix_screeninfo fi;
+
+    int lag = 0;
+    int fd = open("/dev/graphics/fb0", O_RDWR);
+    ioctl(fd, FBIOGET_VSCREENINFO, &vi);
+    ioctl(fd, FBIOGET_FSCREENINFO, &fi);
+    void* bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+    Buffer framebuffer;
+    framebuffer.w = vi.xres;
+    framebuffer.h = vi.yres;
+    framebuffer.s = fi.line_length / (vi.bits_per_pixel >> 3);
+    framebuffer.addr = bits;
+
+    int ch;
+    while ((ch = getopt(argc, argv, "hl:")) != -1) {
+        switch (ch) {
+            case 'l':
+                lag = atoi(optarg);
+                break;
+            case 'h':
+            default:
+                usage(argv[0]);
+                exit(0);
+        }
+    }
+    argc -= optind;
+    argv += optind;
+
+
+    TouchEvents touch;
+    Queue queue;
+
+
+    int x=0, y=0, down=0;
+    int lag_x=0, lag_y=0;
+
+    clearBuffer(&framebuffer, 0);
+    while (true) {
+        uint32_t crt = 0;
+        int err = ioctl(fd, FBIO_WAITFORVSYNC, &crt);
+
+        // draw beam marker
+        drawRect(&framebuffer, 0x400000, framebuffer.w-2, 0, 2, framebuffer.h);
+        // erase screen
+        if (lag) {
+            drawCircle(&framebuffer, 0, lag_x, lag_y, 100);
+            drawHLine(&framebuffer, 0, 0, lag_y, 32);
+        }
+        drawCircle(&framebuffer, 0, x, y, 100, true);
+        drawHLine(&framebuffer, 0, 0, y, 32);
+
+        // draw a line at y=1000
+        drawHLine(&framebuffer, 0x808080, 0, 1000, framebuffer.w);
+
+        // get touch events
+        touch.getMostRecentPosition(&x, &y);
+        queue.push(x, y);
+        queue.get(lag, &lag_x, &lag_y);
+
+        if (lag) {
+            drawCircle(&framebuffer, 0x00FF00, lag_x, lag_y, 100);
+            drawHLine(&framebuffer, 0x00FF00, 0, lag_y, 32);
+        }
+
+        drawCircle(&framebuffer, 0xFFFFFF, x, y, 100, true);
+        drawHLine(&framebuffer, 0xFFFFFF, 0, y, 32);
+
+        // draw end of frame beam marker
+        drawRect(&framebuffer, 0x004000, framebuffer.w-2, 0, 2, framebuffer.h);
+    }
+
+    close(fd);
+    return 0;
+}