a test to measure the touch latency
Change-Id: I01782274563fc9d6e4c1ba48e5aa371c164ed589
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;
+}