Add the performance test program

This program measures the runtime for the compositing functions. We
can observe the runtime change with the compositing size.

Author: Bennctu

Makefile

@@ -111,6 +111,15 @@ libtwin.a_files-y += backend/linux_input.c
 endif
 
 # Standalone application
+ifeq ($(CONFIG_PERFORMANCE_TEST), y)
+target-y += demo-$(BACKEND)
+demo-$(BACKEND)_depends-y += $(target.a-y)
+demo-$(BACKEND)_files-y = apps/perf.c
+demo-$(BACKEND)_includes-y := include
+demo-$(BACKEND)_ldflags-y := \
+	$(target.a-y) \
+	$(TARGET_LIBS)
+endif
 
 ifeq ($(CONFIG_DEMO_APPLICATIONS), y)
 target-y += demo-$(BACKEND)

apps/perf.c

@@ -0,0 +1,103 @@
+/*
+ * Twin - A Tiny Window System
+ * Copyright (c) 2024 National Cheng Kung University, Taiwan
+ * All rights reserved.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include "twin.h"
+
+#define TEST_PIX_WIDTH 1200
+#define TEST_PIX_HEIGHT 800
+
+static twin_pixmap_t *src32, *dst32;
+static int twidth, theight, titers;
+
+static void test_argb32_source_argb32(void)
+{
+    twin_operand_t srco = {.source_kind = TWIN_PIXMAP, .u.pixmap = src32};
+    twin_composite(dst32, 0, 0, &srco, 0, 0, NULL, 0, 0, TWIN_SOURCE, twidth,
+                   theight);
+}
+
+static void test_argb32_over_argb32(void)
+{
+    twin_operand_t srco = {.source_kind = TWIN_PIXMAP, .u.pixmap = src32};
+    twin_composite(dst32, 0, 0, &srco, 0, 0, NULL, 0, 0, TWIN_OVER, twidth,
+                   theight);
+}
+
+static void do_test(const char *name, void (*test)(void))
+{
+    struct timeval start, end;
+    unsigned long long sus, eus;
+    char spc[128];
+    char *s;
+    int i;
+
+    printf("%s", name);
+
+    gettimeofday(&start, NULL);
+    for (i = 0; i < titers; i++)
+        test();
+    gettimeofday(&end, NULL);
+    sus = (unsigned long long) start.tv_sec * 1000000ull + start.tv_usec;
+    eus = (unsigned long long) end.tv_sec * 1000000ull + end.tv_usec;
+
+    s = spc;
+    for (i = strlen(name); i < 40; i++)
+        *(s++) = ' ';
+    *s = 0;
+    printf("%s %f sec\n", spc, ((float) (eus - sus)) / 1000000.0);
+}
+
+#define DO_TEST(name) do_test(#name, test_##name)
+
+static void do_tests(int width, int height, int iters)
+{
+    twidth = width;
+    theight = height;
+    titers = iters;
+
+    DO_TEST(argb32_source_argb32);
+    DO_TEST(argb32_over_argb32);
+}
+
+static void do_all_tests(const char *title,
+                         int len_init,
+                         int len_max,
+                         int len_incre,
+                         int iters)
+{
+    for (int len = len_init; len < len_max; len += len_incre) {
+        printf("[ %s: %dx%dx%d ]\n", title, len, len, iters);
+        do_tests(len, len, iters);
+    }
+
+    printf("\n");
+}
+
+int main(void)
+{
+    /* Create some test pixmaps */
+    src32 = twin_pixmap_from_file("assets/tux.png", TWIN_ARGB32);
+    assert(src32);
+    dst32 = twin_pixmap_create(TWIN_ARGB32, TEST_PIX_WIDTH, TEST_PIX_HEIGHT);
+    assert(dst32);
+
+    /* fill pixmaps */
+    twin_fill(dst32, 0x80112233, TWIN_SOURCE, 0, 0, TEST_PIX_WIDTH,
+              TEST_PIX_HEIGHT);
+
+    /* pre-touch data */
+    test_argb32_source_argb32();
+
+    do_all_tests("Pixmap", 7, 18, 2, 1000000);
+
+    return 0;
+}

configs/Kconfig

@@ -58,11 +58,15 @@ config LOADER_GIF
 
 endmenu
 
-menu "Demo Applications"
+choice
+    prompt "Application Selection"
+    default DEMO_APPLICATIONS
+
+config PERFORMANCE_TEST
+    bool "Built performance test"
 
 config DEMO_APPLICATIONS
     bool "Build demo applications"
-    default y
 
 config DEMO_MULTI
     bool "Build multi demo"
@@ -98,4 +102,4 @@ config DEMO_ANIMATION
     bool "Build animation demo"
     default y
     depends on DEMO_APPLICATIONS 
-endmenu
+endchoice