From 2ff222affbf27e44e985f22ae3af9f3744ccd7ef Mon Sep 17 00:00:00 2001
From: sam <sam@92316355-f0b4-4df1-b90c-862c8a59935f>
Date: Sat, 21 Feb 2009 14:26:01 +0000
Subject: [PATCH] Add a wave filter for crappy sine effects.
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3397 92316355-f0b4-4df1-b90c-862c8a59935f
---
pipi/Makefile.am | 3 +-
pipi/context.c | 26 ++++++++++++++
pipi/filter/wave.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++
pipi/pipi.h | 2 ++
4 files changed, 120 insertions(+), 1 deletion(-)
create mode 100644 pipi/filter/wave.c
diff --git a/pipi/Makefile.am b/pipi/Makefile.am
index 3c277f3..444f1a1 100644
--- a/pipi/Makefile.am
+++ b/pipi/Makefile.am
@@ -72,7 +72,8 @@ filter_sources = \
filter/color.c \
filter/transform.c \
filter/median.c \
- filter/dilate.c
+ filter/dilate.c \
+ filter/wave.c
quantize_sources = \
quantize/reduce.c
diff --git a/pipi/context.c b/pipi/context.c
index a1c8e3b..efe366c 100644
--- a/pipi/context.c
+++ b/pipi/context.c
@@ -88,6 +88,7 @@ pipi_command_t const *pipi_get_command_list(void)
{ "screen", 0 },
{ "overlay", 0 },
{ "line", 1 },
+ { "wave", 1 },
/* End marker */
{ NULL, 0 }
@@ -772,6 +773,31 @@ int pipi_command(pipi_context_t *ctx, char const *cmd, ...)
x1, y1, x2, y2, color, aa);
ctx->nimages++;
}
+ else if(!strcmp(cmd, "wave"))
+ {
+ pipi_image_t *tmp;
+ char const *arg;
+ va_list ap;
+ float freq, phase, theta, ampx, ampy;
+ int ret;
+
+ if(ctx->nimages < 1)
+ return -1;
+
+ va_start(ap, cmd);
+ arg = va_arg(ap, char const *);
+ va_end(ap);
+
+ ret = sscanf(arg, "%g,%g,%g,%gx%g",
+ &freq, &phase, &theta, &x, &y);
+ if(ret < 5)
+ return -1;
+
+ tmp = ctx->images[ctx->nimages - 1];
+ ctx->images[ctx->nimages - 1] = pipi_wave(tmp, freq, phase,
+ theta, ampx, ampy);
+ pipi_free(tmp);
+ }
else
{
return -1;
diff --git a/pipi/filter/wave.c b/pipi/filter/wave.c
new file mode 100644
index 0000000..68d069b
--- /dev/null
+++ b/pipi/filter/wave.c
@@ -0,0 +1,90 @@
+/*
+ * libpipi Pathetic image processing interface library
+ * Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
+ * All Rights Reserved
+ *
+ * $Id$
+ *
+ * This library is free software. It comes without any warranty, to
+ * the extent permitted by applicable law. You can redistribute it
+ * and/or modify it under the terms of the Do What The Fuck You Want
+ * To Public License, Version 2, as published by Sam Hocevar. See
+ * http://sam.zoy.org/wtfpl/COPYING for more details.
+ */
+
+/*
+ * wave.c: wave and warping effects
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include "pipi.h"
+#include "pipi_internals.h"
+
+pipi_image_t *pipi_wave(pipi_image_t *src, double freq, double phase,
+ double theta, double xamp, double yamp)
+{
+ pipi_image_t *dst;
+ pipi_pixels_t *srcp, *dstp;
+ float *srcdata, *dstdata;
+ double sint, cost;
+ int x, y, w, h, i, gray;
+
+ w = src->w;
+ h = src->h;
+
+ gray = (src->last_modified == PIPI_PIXELS_Y_F32);
+
+ srcp = gray ? pipi_get_pixels(src, PIPI_PIXELS_Y_F32)
+ : pipi_get_pixels(src, PIPI_PIXELS_RGBA_F32);
+ srcdata = (float *)srcp->pixels;
+
+ dst = pipi_new(w, h);
+ dstp = gray ? pipi_get_pixels(dst, PIPI_PIXELS_Y_F32)
+ : pipi_get_pixels(dst, PIPI_PIXELS_RGBA_F32);
+ dstdata = (float *)dstp->pixels;
+
+ sint = sin(theta);
+ cost = cos(theta);
+
+ for(y = 0; y < h; y++)
+ {
+ for(x = 0; x < w; x++)
+ {
+ double t = cost * (x - w / 2) + sint * (y - h / 2);
+ double step = sin(t * freq + phase);
+ double dx = xamp * step;
+ double dy = yamp * step;
+
+ int x2 = x + dx;
+ int y2 = y + dy;
+
+ if(x2 < 0) x2 = 0;
+ else if(x2 >= w) x2 = w - 1;
+
+ if(y2 < 0) y2 = 0;
+ else if(y2 >= h) y2 = h - 1;
+
+ if(gray)
+ {
+ dstdata[y * w + x] = srcdata[y2 * w + x2];
+ }
+ else
+ {
+ for(i = 0; i < 4; i++)
+ {
+ dstdata[4 * (y * w + x) + i]
+ = srcdata[4 * (y2 * w + x2) + i];
+ }
+ }
+ }
+ }
+
+ return dst;
+}
+
diff --git a/pipi/pipi.h b/pipi/pipi.h
index f44ebc1..0a8d627 100644
--- a/pipi/pipi.h
+++ b/pipi/pipi.h
@@ -197,6 +197,8 @@ __extern pipi_image_t *pipi_median(pipi_image_t *, int);
__extern pipi_image_t *pipi_median_ext(pipi_image_t *, int, int);
__extern pipi_image_t *pipi_dilate(pipi_image_t *);
__extern pipi_image_t *pipi_erode(pipi_image_t *);
+__extern pipi_image_t *pipi_wave(pipi_image_t *, double, double,
+ double, double, double);
__extern pipi_image_t *pipi_order(pipi_image_t *);