Add a simple benchmark plugin for the scaler, using the pluginlib import of resize_on_load.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20969 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 137 insertions, 0 deletions

diff --git a/apps/plugins/bench_scaler.c b/apps/plugins/bench_scaler.c
new file mode 100644
index 0000000..723e427
--- /dev/null
+++ b/apps/plugins/bench_scaler.c
@@ -0,0 +1,137 @@
+/*****************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _// __ \_/ ___\|  |/ /| __ \ / __ \  \/  /
+ *   Jukebox    |    |   ( (__) )  \___|    ( | \_\ ( (__) )    (
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 Andrew Mahone
+ *
+ * scaler benchmark
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+#include "lib/jpeg_mem.h"
+PLUGIN_HEADER
+
+static unsigned char output;
+static int output_y = 0;
+static int font_h;
+static unsigned char *plugin_buf;
+char output_buf[256];
+struct img_part part;
+
+/* a null output plugin to save memory and better isolate scale cost */
+static unsigned int get_size_null(struct bitmap *bm)
+{
+    (void) bm;
+    return 1;
+}
+
+static void output_row_null(uint32_t row, void * row_in,
+                            struct scaler_context *ctx)
+{
+    (void) row;
+    uint32_t *in = (uint32_t *)row_in;
+#ifdef HAVE_LCD_COLOR
+    uint32_t *lim = in + ctx->bm->width * 3;
+#else
+    uint32_t *lim = in + ctx->bm->width;
+#endif
+    for (; in < lim; in++)
+        output = SC_MUL(*in + ctx->round, ctx->divisor);
+    return;
+}
+
+struct img_part *store_part_null(void *args)
+{
+    (void) args;
+    part.len = 256;
+    part.buf = (typeof(part.buf))plugin_buf;
+    return &part;
+}
+
+const struct custom_format format_null = {
+    .output_row_8 = NULL,
+#ifdef HAVE_LCD_COLOR
+    .output_row_32 = {
+        output_row_null,
+        output_row_null
+    },
+#else
+    .output_row_32 = output_row_null,
+#endif
+    .get_size = get_size_null
+};
+
+#define lcd_printf(...) \
+do { \
+    rb->snprintf(output_buf, sizeof(output_buf), __VA_ARGS__); \
+    rb->lcd_putsxy(0, output_y, output_buf); \
+    rb->lcd_update_rect(0, output_y, LCD_WIDTH, font_h); \
+    output_y += font_h; \
+} while (0)
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(const void* parameter)
+{
+    size_t plugin_buf_len;
+    plugin_buf = (unsigned char *)rb->plugin_get_buffer(&plugin_buf_len);
+    struct bitmap bm;
+    struct dim in_dim;
+    struct rowset rset = {
+        .rowstep = 1,
+        .rowstart = 0,
+    };
+    (void)parameter;
+
+    rb->lcd_set_drawmode(DRMODE_SOLID|DRMODE_INVERSEVID);
+    rb->lcd_fillrect(0, 0, LCD_WIDTH, LCD_HEIGHT);
+    rb->lcd_set_drawmode(DRMODE_SOLID);
+    rb->lcd_getstringsize("A", NULL, &font_h);
+    bm.data = plugin_buf;
+    int in, out;
+    for (in = 64; in < 1025; in <<= 2)
+    {
+        for (out = 64; out < 257; out <<= 1)
+        {
+            if (in == out)
+                continue;
+            lcd_printf("timing %dx%d->%dx>%d scale", in, in, out, out);
+            long t1, t2;
+            int count = 0;
+            t2 = *(rb->current_tick);
+            in_dim.width = in_dim.height = in;
+            bm.width = bm.height = rset.rowstop = out;
+            while (t2 != (t1 = *(rb->current_tick)));
+            do {
+                resize_on_load(&bm, false, &in_dim, &rset, (unsigned char *)plugin_buf, plugin_buf_len, &format_null, IF_PIX_FMT(0,) store_part_null, NULL);
+                count++;
+                t2 = *(rb->current_tick);
+            } while (t2 - t1 < HZ || count < 10);
+            t2 -= t1;
+            t2 *= 10;
+            t2 += count >> 1;
+            t2 /= count;
+            t1 = t2 / 1000;
+            t2 -= t1 * 1000;
+            lcd_printf("%01d.%03d secs/scale", (int)t1, (int)t2);
+            if (!(bm.width && bm.height))
+                break;
+        }
+    }
+
+    while (rb->get_action(CONTEXT_STD,1) != ACTION_STD_OK) rb->yield();
+    return PLUGIN_OK;
+}