checkasm: Add vf_blend tests

tests/checkasm/Makefile

 # libavcodec tests
 AVCODECOBJS-$(CONFIG_ALAC_DECODER) += alacdsp.o
+AVCODECOBJS-$(CONFIG_BLEND_FILTER) += vf_blend.o
 AVCODECOBJS-$(CONFIG_BSWAPDSP) += bswapdsp.o
 AVCODECOBJS-$(CONFIG_DCA_DECODER) += synth_filter.o
 AVCODECOBJS-$(CONFIG_FLACDSP)  += flacdsp.o

tests/checkasm/checkasm.c

@@ -68,6 +68,9 @@ static const struct {
     #if CONFIG_ALAC_DECODER
         { "alacdsp", checkasm_check_alacdsp },
     #endif
+    #if CONFIG_BLEND_FILTER
+        { "vf_blend", checkasm_check_blend },
+    #endif
     #if CONFIG_BSWAPDSP
         { "bswapdsp", checkasm_check_bswapdsp },
     #endif

tests/checkasm/checkasm.h

@@ -31,6 +31,7 @@
 #include "libavutil/timer.h"
 
 void checkasm_check_alacdsp(void);
+void checkasm_check_blend(void);
 void checkasm_check_bswapdsp(void);
 void checkasm_check_flacdsp(void);
 void checkasm_check_fmtconvert(void);

tests/checkasm/vf_blend.c

+/*
+ * Copyright (c) 2016 Tiancheng "Timothy" Gu
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <string.h>
+#include "checkasm.h"
+#include "libavfilter/blend.h"
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+
+#define WIDTH 256
+#define HEIGHT 256
+#define BUF_UNITS 9
+#define SIZE_PER_UNIT (WIDTH * HEIGHT)
+#define BUF_SIZE (BUF_UNITS * SIZE_PER_UNIT)
+
+#define randomize_buffers()                   \
+    do {                                      \
+        int i, j;                             \
+        for (i = 0; i < HEIGHT; i++) {        \
+            for (j = 0; j < WIDTH; j++) {     \
+                top1[i * WIDTH + j] =         \
+                top2[i * WIDTH + j] = i;      \
+                bot1[i * WIDTH + j] =         \
+                bot2[i * WIDTH + j] = j;      \
+            }                                 \
+        }                                     \
+        for (i = 0; i < SIZE_PER_UNIT; i += 4) { \
+            uint32_t r = rnd();               \
+            AV_WN32A(dst1 + i, r);            \
+            AV_WN32A(dst2 + i, r);            \
+        }                                     \
+        for (; i < BUF_SIZE; i += 4) {        \
+            uint32_t r = rnd();               \
+            AV_WN32A(top1 + i, r);            \
+            AV_WN32A(top2 + i, r);            \
+            r = rnd();                        \
+            AV_WN32A(bot1 + i, r);            \
+            AV_WN32A(bot2 + i, r);            \
+            r = rnd();                        \
+            AV_WN32A(dst1 + i, r);            \
+            AV_WN32A(dst2 + i, r);            \
+        }                                     \
+    } while (0)
+
+#define check_blend_func()                                                                 \
+    do {                                                                                   \
+        int i;                                                                             \
+        declare_func(void, const uint8_t *top, ptrdiff_t top_linesize,                     \
+                     const uint8_t *bottom, ptrdiff_t bottom_linesize,                     \
+                     uint8_t *dst, ptrdiff_t dst_linesize,                                 \
+                     ptrdiff_t width, ptrdiff_t height,                                    \
+                     struct FilterParams *param, double *values);                          \
+                                                                                           \
+        for (i = 0; i < BUF_UNITS - 1; i++) {                                              \
+            int src_offset = i * SIZE_PER_UNIT + i; /* Test various alignments */          \
+            int dst_offset = i * SIZE_PER_UNIT; /* dst must be aligned */                  \
+            randomize_buffers();                                                           \
+            call_ref(top1 + src_offset, WIDTH, bot1 + src_offset, WIDTH,                   \
+                     dst1 + dst_offset, WIDTH, WIDTH, HEIGHT, &param, NULL);               \
+            call_new(top2 + src_offset, WIDTH, bot2 + src_offset, WIDTH,                   \
+                     dst2 + dst_offset, WIDTH, WIDTH, HEIGHT, &param, NULL);               \
+            if (memcmp(top1, top2, BUF_SIZE) || memcmp(bot1, bot2, BUF_SIZE) || memcmp(dst1, dst2, BUF_SIZE)) \
+                fail();                                                                    \
+            bench_new(top2 + src_offset, WIDTH, bot2 + src_offset, WIDTH,                  \
+                      dst2, WIDTH, WIDTH, HEIGHT, &param, NULL);                           \
+        }                                                                                  \
+    } while (0)
+
+void checkasm_check_blend(void)
+{
+    uint8_t *top1 = av_malloc(BUF_SIZE);
+    uint8_t *top2 = av_malloc(BUF_SIZE);
+    uint8_t *bot1 = av_malloc(BUF_SIZE);
+    uint8_t *bot2 = av_malloc(BUF_SIZE);
+    uint8_t *dst1 = av_malloc(BUF_SIZE);
+    uint8_t *dst2 = av_malloc(BUF_SIZE);
+    FilterParams param = {
+        .opacity = 1.0,
+    };
+
+#define check_and_report(name, val)               \
+    param.mode = val;                             \
+    ff_blend_init(&param, 0);                     \
+    if (check_func(param.blend, #name))           \
+        check_blend_func();
+
+    check_and_report(addition, BLEND_ADDITION)
+    check_and_report(addition128, BLEND_ADDITION128)
+    check_and_report(and, BLEND_AND)
+    check_and_report(average, BLEND_AVERAGE)
+    check_and_report(darken, BLEND_DARKEN)
+    check_and_report(difference128, BLEND_DIFFERENCE128)
+    check_and_report(hardmix, BLEND_HARDMIX)
+    check_and_report(lighten, BLEND_LIGHTEN)
+    check_and_report(multiply, BLEND_MULTIPLY)
+    check_and_report(or, BLEND_OR)
+    check_and_report(phoenix, BLEND_PHOENIX)
+    check_and_report(screen, BLEND_SCREEN)
+    check_and_report(subtract, BLEND_SUBTRACT)
+    check_and_report(xor, BLEND_XOR)
+    check_and_report(difference, BLEND_DIFFERENCE)
+    check_and_report(negation, BLEND_NEGATION)
+
+    report("8bit");
+
+    av_freep(&top1);
+    av_freep(&top2);
+    av_freep(&bot1);
+    av_freep(&bot2);
+    av_freep(&dst1);
+    av_freep(&dst2);
+}