[FFmpeg-devel] [PATCH] avfilter: add hqx filter (hq2x, hq3x, hq4x)
Clément Bœsch
u at pkh.me
Tue Jun 17 22:05:28 CEST 2014
Partially fixes Ticket #3404 (xbr filter remaining)
---
We can probably make more meaningful versions of hq[234]x_interp* but I believe
that's already a huge improvement over the original code.
[~/src/hqx/hqx-read-only/src]☭ wc -l src/*.[ch]
141 src/common.h
2809 src/hq2x.c
3787 src/hq3x.c
5241 src/hq4x.c
138 src/hqx.c
55 src/hqx.h
38 src/init.c
12209 total
[~/src/ffmpeg]☭ wc -l libavfilter/vf_hqx.c
557 libavfilter/vf_hqx.c
Note1: the filter is bitexact for the reference implementation, except for
filter/pixelart1.png where the reference code hits this bug:
https://code.google.com/p/hqx/issues/detail?id=8
---
Changelog | 1 +
MAINTAINERS | 1 +
doc/filters.texi | 14 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_hqx.c | 557 ++++++++++++++++++++++++++++++++++++++++++++
tests/fate/filter-video.mak | 7 +
tests/ref/fate/filter-hq2x | 3 +
tests/ref/fate/filter-hq3x | 3 +
tests/ref/fate/filter-hq4x | 3 +
11 files changed, 592 insertions(+), 1 deletion(-)
create mode 100644 libavfilter/vf_hqx.c
create mode 100644 tests/ref/fate/filter-hq2x
create mode 100644 tests/ref/fate/filter-hq3x
create mode 100644 tests/ref/fate/filter-hq4x
diff --git a/Changelog b/Changelog
index fa443dc..0346877 100644
--- a/Changelog
+++ b/Changelog
@@ -29,6 +29,7 @@ version <next>:
- showcqt multimedia filter
- zoompan filter
- signalstats filter
+- hqx filter (hq2x, hq3x, hq4x)
version 2.2:
diff --git a/MAINTAINERS b/MAINTAINERS
index a61f1e5..ea474df 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -350,6 +350,7 @@ Filters:
vf_drawbox.c/drawgrid Andrey Utkin
vf_extractplanes.c Paul B Mahol
vf_histogram.c Paul B Mahol
+ vf_hqx.c Clément Bœsch
vf_il.c Paul B Mahol
vf_mergeplanes.c Paul B Mahol
vf_psnr.c Paul B Mahol
diff --git a/doc/filters.texi b/doc/filters.texi
index 63bd22e..c3a0d2c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5203,6 +5203,20 @@ A floating point number which specifies chroma temporal strength. It defaults to
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}.
@end table
+ at section hqx
+
+High-quality magnification filter designed for pixel art, originally created by
+Maxim Stepin.
+
+It accepts the following option:
+
+ at table @option
+ at item n
+Set the scaling dimension: @code{2} for @code{hq2x}, @code{3} for
+ at code{hq3x} and @code{4} for @code{hq4x}.
+Default is @code{3}.
+ at end table
+
@section hue
Modify the hue and/or the saturation of the input.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 5b9fabf..08817ee 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -130,6 +130,7 @@ OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
OBJS-$(CONFIG_HISTEQ_FILTER) += vf_histeq.o
OBJS-$(CONFIG_HISTOGRAM_FILTER) += vf_histogram.o
OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
+OBJS-$(CONFIG_HQX_FILTER) += vf_hqx.o
OBJS-$(CONFIG_HUE_FILTER) += vf_hue.o
OBJS-$(CONFIG_IDET_FILTER) += vf_idet.o
OBJS-$(CONFIG_IL_FILTER) += vf_il.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 1e86967..e4ac983 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -148,6 +148,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(HISTEQ, histeq, vf);
REGISTER_FILTER(HISTOGRAM, histogram, vf);
REGISTER_FILTER(HQDN3D, hqdn3d, vf);
+ REGISTER_FILTER(HQX, hqx, vf);
REGISTER_FILTER(HUE, hue, vf);
REGISTER_FILTER(IDET, idet, vf);
REGISTER_FILTER(IL, il, vf);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index a518e8f..f125032 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 4
-#define LIBAVFILTER_VERSION_MINOR 8
+#define LIBAVFILTER_VERSION_MINOR 9
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_hqx.c b/libavfilter/vf_hqx.c
new file mode 100644
index 0000000..2b608b3
--- /dev/null
+++ b/libavfilter/vf_hqx.c
@@ -0,0 +1,557 @@
+/*
+ * Copyright (c) 2014 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/**
+ * hqx magnification filters
+ *
+ * @see http://en.wikipedia.org/wiki/Hqx
+ * @see http://web.archive.org/web/20131114143602/http://www.hiend3d.com/hq3x.html
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/avassert.h"
+#include "libavutil/pixdesc.h"
+#include "internal.h"
+
+typedef int (*hqxfunc_t)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+
+typedef struct {
+ const AVClass *class;
+ int n;
+ hqxfunc_t func;
+ uint32_t rgbtoyuv[1<<24];
+} HQXContext;
+
+typedef struct ThreadData {
+ AVFrame *in, *out;
+ const uint32_t *rgbtoyuv;
+} ThreadData;
+
+#define OFFSET(x) offsetof(HQXContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption hqx_options[] = {
+ { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, .flags = FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(hqx);
+
+static av_always_inline uint32_t rgb2yuv(const uint32_t *r2y, uint32_t c)
+{
+ return r2y[c & 0xffffff];
+}
+
+static av_always_inline int yuv_diff(uint32_t yuv1, uint32_t yuv2)
+{
+#define YMASK 0xff0000
+#define UMASK 0x00ff00
+#define VMASK 0x0000ff
+ return abs((yuv1 & YMASK) - (yuv2 & YMASK)) > (48 << 16) ||
+ abs((yuv1 & UMASK) - (yuv2 & UMASK)) > ( 7 << 8) ||
+ abs((yuv1 & VMASK) - (yuv2 & VMASK)) > ( 6 << 0);
+}
+
+/* (c1*w1 + c2*w2) >> s */
+static av_always_inline uint32_t interp_2px(uint32_t c1, int w1, uint32_t c2, int w2, int s)
+{
+ return (((((c1 & 0xff00ff00) >> 8) * w1 + ((c2 & 0xff00ff00) >> 8) * w2) << (8 - s)) & 0xff00ff00) |
+ (((((c1 & 0x00ff00ff) ) * w1 + ((c2 & 0x00ff00ff) ) * w2) >> s ) & 0x00ff00ff);
+}
+
+/* (c1*w1 + c2*w2 + c3*w3) >> s */
+static av_always_inline uint32_t interp_3px(uint32_t c1, int w1, uint32_t c2, int w2, uint32_t c3, int w3, int s)
+{
+ return (((((c1 & 0xff00ff00) >> 8) * w1 + ((c2 & 0xff00ff00) >> 8) * w2 + ((c3 & 0xff00ff00) >> 8) * w3) << (8 - s)) & 0xff00ff00) |
+ (((((c1 & 0x00ff00ff) ) * w1 + ((c2 & 0x00ff00ff) ) * w2 + ((c3 & 0x00ff00ff) ) * w3) >> s ) & 0x00ff00ff);
+}
+
+/* m is the mask of diff with the center pixel that matters in the pattern, and
+ * r is the expected result (bit set to 1 if there is difference with the
+ * center, 0 otherwise */
+#define P(m, r) ((k_shuffled & (m)) == (r))
+
+/* adjust 012345678 to 01235678: the mask doesn't contain the (null) diff
+ * between the center/current pixel and itself */
+#define DROP4(z) ((z) > 4 ? (z)-1 : (z))
+
+/* shuffle the input mask: move bit n (4-adjusted) to position stored in p<n> */
+#define SHF(x, rot, n) (((x) >> ((rot) ? 7-DROP4(n) : DROP4(n)) & 1) << DROP4(p##n))
+
+/* used to check if there is YUV difference between 2 pixels */
+#define WDIFF(c1, c2) yuv_diff(rgb2yuv(r2y, c1), rgb2yuv(r2y, c2))
+
+/* bootstrap template for every interpolation code. It defines the shuffled
+ * masks and surrounded pixels. the rot flag is used to indicate if it's a
+ * rotation; its basic effect is to shuffle k using p8..p0 instead of p0..p8 */
+#define INTERP_BOOTSTRAP(rot) \
+ const int k_shuffled = SHF(k,rot,0) | SHF(k,rot,1) | SHF(k,rot,2) \
+ | SHF(k,rot,3) | 0 | SHF(k,rot,5) \
+ | SHF(k,rot,6) | SHF(k,rot,7) | SHF(k,rot,8); \
+ \
+ const uint32_t w0 = w[p0], w1 = w[p1], \
+ w3 = w[p3], w4 = w[p4], w5 = w[p5], \
+ w7 = w[p7]
+
+/* Assuming p0..p8 is mapped to pixels 0..8, this function interpolates the
+ * top-left pixel in the total of the 2x2 pixels to interpolates. The function
+ * is also used for the 3 other pixels */
+static av_always_inline uint32_t hq2x_interp_1x1(const uint32_t *r2y, int k,
+ const uint32_t *w,
+ int p0, int p1, int p2,
+ int p3, int p4, int p5,
+ int p6, int p7, int p8)
+{
+ INTERP_BOOTSTRAP(0);
+
+ if ((P(0xbf,0x37) || P(0xdb,0x13)) && WDIFF(w1, w5))
+ return interp_2px(w4, 3, w3, 1, 2);
+ if ((P(0xdb,0x49) || P(0xef,0x6d)) && WDIFF(w7, w3))
+ return interp_2px(w4, 3, w1, 1, 2);
+ if ((P(0x0b,0x0b) || P(0xfe,0x4a) || P(0xfe,0x1a)) && WDIFF(w3, w1))
+ return w4;
+ if ((P(0x6f,0x2a) || P(0x5b,0x0a) || P(0xbf,0x3a) || P(0xdf,0x5a) ||
+ P(0x9f,0x8a) || P(0xcf,0x8a) || P(0xef,0x4e) || P(0x3f,0x0e) ||
+ P(0xfb,0x5a) || P(0xbb,0x8a) || P(0x7f,0x5a) || P(0xaf,0x8a) ||
+ P(0xeb,0x8a)) && WDIFF(w3, w1))
+ return interp_2px(w4, 3, w0, 1, 2);
+ if (P(0x0b,0x08))
+ return interp_3px(w4, 2, w0, 1, w1, 1, 2);
+ if (P(0x0b,0x02))
+ return interp_3px(w4, 2, w0, 1, w3, 1, 2);
+ if (P(0x2f,0x2f))
+ return interp_3px(w4, 14, w3, 1, w1, 1, 4);
+ if (P(0xbf,0x37) || P(0xdb,0x13))
+ return interp_3px(w4, 5, w1, 2, w3, 1, 3);
+ if (P(0xdb,0x49) || P(0xef,0x6d))
+ return interp_3px(w4, 5, w3, 2, w1, 1, 3);
+ if (P(0x1b,0x03) || P(0x4f,0x43) || P(0x8b,0x83) || P(0x6b,0x43))
+ return interp_2px(w4, 3, w3, 1, 2);
+ if (P(0x4b,0x09) || P(0x8b,0x89) || P(0x1f,0x19) || P(0x3b,0x19))
+ return interp_2px(w4, 3, w1, 1, 2);
+ if (P(0x7e,0x2a) || P(0xef,0xab) || P(0xbf,0x8f) || P(0x7e,0x0e))
+ return interp_3px(w4, 2, w3, 3, w1, 3, 3);
+ if (P(0xfb,0x6a) || P(0x6f,0x6e) || P(0x3f,0x3e) || P(0xfb,0xfa) ||
+ P(0xdf,0xde) || P(0xdf,0x1e))
+ return interp_2px(w4, 3, w0, 1, 2);
+ if (P(0x0a,0x00) || P(0x4f,0x4b) || P(0x9f,0x1b) || P(0x2f,0x0b) ||
+ P(0xbe,0x0a) || P(0xee,0x0a) || P(0x7e,0x0a) || P(0xeb,0x4b) ||
+ P(0x3b,0x1b))
+ return interp_3px(w4, 2, w3, 1, w1, 1, 2);
+ return interp_3px(w4, 6, w3, 1, w1, 1, 3);
+}
+
+/* Assuming p0..p8 is mapped to pixels 0..8, this function interpolates the
+ * top-left and top-center pixel in the total of the 3x3 pixels to
+ * interpolates. The function is also used for the 3 other couples of pixels
+ * defining the outline. The center pixel is not defined though this function,
+ * since it's just the as the original value. */
+static av_always_inline void hq3x_interp_2x1(uint32_t *dst, int dst_linesize,
+ const uint32_t *r2y, int k,
+ const uint32_t *w,
+ int pos00, int pos01,
+ int p0, int p1, int p2,
+ int p3, int p4, int p5,
+ int p6, int p7, int p8,
+ int rotate)
+{
+ INTERP_BOOTSTRAP(rotate);
+
+ uint32_t *dst00 = &dst[dst_linesize*(pos00>>1) + (pos00&1)];
+ uint32_t *dst01 = &dst[dst_linesize*(pos01>>1) + (pos01&1)];
+
+ if ((P(0xdb,0x49) || P(0xef,0x6d)) && WDIFF(w7, w3))
+ *dst00 = interp_2px(w4, 3, w1, 1, 2);
+ else if ((P(0xbf,0x37) || P(0xdb,0x13)) && WDIFF(w1, w5))
+ *dst00 = interp_2px(w4, 3, w3, 1, 2);
+ else if ((P(0x0b,0x0b) || P(0xfe,0x4a) || P(0xfe,0x1a)) && WDIFF(w3, w1))
+ *dst00 = w4;
+ else if ((P(0x6f,0x2a) || P(0x5b,0x0a) || P(0xbf,0x3a) || P(0xdf,0x5a) ||
+ P(0x9f,0x8a) || P(0xcf,0x8a) || P(0xef,0x4e) || P(0x3f,0x0e) ||
+ P(0xfb,0x5a) || P(0xbb,0x8a) || P(0x7f,0x5a) || P(0xaf,0x8a) ||
+ P(0xeb,0x8a)) && WDIFF(w3, w1))
+ *dst00 = interp_2px(w4, 3, w0, 1, 2);
+ else if (P(0x4b,0x09) || P(0x8b,0x89) || P(0x1f,0x19) || P(0x3b,0x19))
+ *dst00 = interp_2px(w4, 3, w1, 1, 2);
+ else if (P(0x1b,0x03) || P(0x4f,0x43) || P(0x8b,0x83) || P(0x6b,0x43))
+ *dst00 = interp_2px(w4, 3, w3, 1, 2);
+ else if (P(0x7e,0x2a) || P(0xef,0xab) || P(0xbf,0x8f) || P(0x7e,0x0e))
+ *dst00 = interp_2px(w3, 1, w1, 1, 1);
+ else if (P(0x4f,0x4b) || P(0x9f,0x1b) || P(0x2f,0x0b) || P(0xbe,0x0a) ||
+ P(0xee,0x0a) || P(0x7e,0x0a) || P(0xeb,0x4b) || P(0x3b,0x1b))
+ *dst00 = interp_3px(w4, 2, w3, 7, w1, 7, 4);
+ else if (P(0x0b,0x08) || P(0xf9,0x68) || P(0xf3,0x62) || P(0x6d,0x6c) ||
+ P(0x67,0x66) || P(0x3d,0x3c) || P(0x37,0x36) || P(0xf9,0xf8) ||
+ P(0xdd,0xdc) || P(0xf3,0xf2) || P(0xd7,0xd6) || P(0xdd,0x1c) ||
+ P(0xd7,0x16) || P(0x0b,0x02))
+ *dst00 = interp_2px(w4, 3, w0, 1, 2);
+ else
+ *dst00 = interp_3px(w4, 2, w3, 1, w1, 1, 2);
+
+ if ((P(0xfe,0xde) || P(0x9e,0x16) || P(0xda,0x12) || P(0x17,0x16) ||
+ P(0x5b,0x12) || P(0xbb,0x12)) && WDIFF(w1, w5))
+ *dst01 = w4;
+ else if ((P(0x0f,0x0b) || P(0x5e,0x0a) || P(0xfb,0x7b) || P(0x3b,0x0b) ||
+ P(0xbe,0x0a) || P(0x7a,0x0a)) && WDIFF(w3, w1))
+ *dst01 = w4;
+ else if (P(0xbf,0x8f) || P(0x7e,0x0e) || P(0xbf,0x37) || P(0xdb,0x13))
+ *dst01 = interp_2px(w1, 3, w4, 1, 2);
+ else if (P(0x02,0x00) || P(0x7c,0x28) || P(0xed,0xa9) || P(0xf5,0xb4) ||
+ P(0xd9,0x90))
+ *dst01 = interp_2px(w4, 3, w1, 1, 2);
+ else if (P(0x4f,0x4b) || P(0xfb,0x7b) || P(0xfe,0x7e) || P(0x9f,0x1b) ||
+ P(0x2f,0x0b) || P(0xbe,0x0a) || P(0x7e,0x0a) || P(0xfb,0x4b) ||
+ P(0xfb,0xdb) || P(0xfe,0xde) || P(0xfe,0x56) || P(0x57,0x56) ||
+ P(0x97,0x16) || P(0x3f,0x1e) || P(0xdb,0x12) || P(0xbb,0x12))
+ *dst01 = interp_2px(w4, 7, w1, 1, 3);
+ else
+ *dst01 = w4;
+}
+
+/* Assuming p0..p8 is mapped to pixels 0..8, this function interpolates the
+ * top-left block of 2x2 pixels in the total of the 4x4 pixels (or 4 blocks) to
+ * interpolates. The function is also used for the 3 other blocks of 2x2
+ * pixels. */
+static av_always_inline void hq4x_interp_2x2(uint32_t *dst, int dst_linesize,
+ const uint32_t *r2y, int k,
+ const uint32_t *w,
+ int pos00, int pos01,
+ int pos10, int pos11,
+ int p0, int p1, int p2,
+ int p3, int p4, int p5,
+ int p6, int p7, int p8)
+{
+ INTERP_BOOTSTRAP(0);
+
+ uint32_t *dst00 = &dst[dst_linesize*(pos00>>1) + (pos00&1)];
+ uint32_t *dst01 = &dst[dst_linesize*(pos01>>1) + (pos01&1)];
+ uint32_t *dst10 = &dst[dst_linesize*(pos10>>1) + (pos10&1)];
+ uint32_t *dst11 = &dst[dst_linesize*(pos11>>1) + (pos11&1)];
+
+ const int cond00 = (P(0xbf,0x37) || P(0xdb,0x13)) && WDIFF(w1, w5);
+ const int cond01 = (P(0xdb,0x49) || P(0xef,0x6d)) && WDIFF(w7, w3);
+ const int cond02 = (P(0x6f,0x2a) || P(0x5b,0x0a) || P(0xbf,0x3a) ||
+ P(0xdf,0x5a) || P(0x9f,0x8a) || P(0xcf,0x8a) ||
+ P(0xef,0x4e) || P(0x3f,0x0e) || P(0xfb,0x5a) ||
+ P(0xbb,0x8a) || P(0x7f,0x5a) || P(0xaf,0x8a) ||
+ P(0xeb,0x8a)) && WDIFF(w3, w1);
+ const int cond03 = P(0xdb,0x49) || P(0xef,0x6d);
+ const int cond04 = P(0xbf,0x37) || P(0xdb,0x13);
+ const int cond05 = P(0x1b,0x03) || P(0x4f,0x43) || P(0x8b,0x83) ||
+ P(0x6b,0x43);
+ const int cond06 = P(0x4b,0x09) || P(0x8b,0x89) || P(0x1f,0x19) ||
+ P(0x3b,0x19);
+ const int cond07 = P(0x0b,0x08) || P(0xf9,0x68) || P(0xf3,0x62) ||
+ P(0x6d,0x6c) || P(0x67,0x66) || P(0x3d,0x3c) ||
+ P(0x37,0x36) || P(0xf9,0xf8) || P(0xdd,0xdc) ||
+ P(0xf3,0xf2) || P(0xd7,0xd6) || P(0xdd,0x1c) ||
+ P(0xd7,0x16) || P(0x0b,0x02);
+ const int cond08 = (P(0x0f,0x0b) || P(0x2b,0x0b) || P(0xfe,0x4a) ||
+ P(0xfe,0x1a)) && WDIFF(w3, w1);
+ const int cond09 = P(0x2f,0x2f);
+ const int cond10 = P(0x0a,0x00);
+ const int cond11 = P(0x0b,0x09);
+ const int cond12 = P(0x7e,0x2a) || P(0xef,0xab);
+ const int cond13 = P(0xbf,0x8f) || P(0x7e,0x0e);
+ const int cond14 = P(0x4f,0x4b) || P(0x9f,0x1b) || P(0x2f,0x0b) ||
+ P(0xbe,0x0a) || P(0xee,0x0a) || P(0x7e,0x0a) ||
+ P(0xeb,0x4b) || P(0x3b,0x1b);
+ const int cond15 = P(0x0b,0x03);
+
+ if (cond00)
+ *dst00 = interp_2px(w4, 5, w3, 3, 3);
+ else if (cond01)
+ *dst00 = interp_2px(w4, 5, w1, 3, 3);
+ else if ((P(0x0b,0x0b) || P(0xfe,0x4a) || P(0xfe,0x1a)) && WDIFF(w3, w1))
+ *dst00 = w4;
+ else if (cond02)
+ *dst00 = interp_2px(w4, 5, w0, 3, 3);
+ else if (cond03)
+ *dst00 = interp_2px(w4, 3, w3, 1, 2);
+ else if (cond04)
+ *dst00 = interp_2px(w4, 3, w1, 1, 2);
+ else if (cond05)
+ *dst00 = interp_2px(w4, 5, w3, 3, 3);
+ else if (cond06)
+ *dst00 = interp_2px(w4, 5, w1, 3, 3);
+ else if (P(0x0f,0x0b) || P(0x5e,0x0a) || P(0x2b,0x0b) || P(0xbe,0x0a) ||
+ P(0x7a,0x0a) || P(0xee,0x0a))
+ *dst00 = interp_2px(w1, 1, w3, 1, 1);
+ else if (cond07)
+ *dst00 = interp_2px(w4, 5, w0, 3, 3);
+ else
+ *dst00 = interp_3px(w4, 2, w1, 1, w3, 1, 2);
+
+ if (cond00)
+ *dst01 = interp_2px(w4, 7, w3, 1, 3);
+ else if (cond08)
+ *dst01 = w4;
+ else if (cond02)
+ *dst01 = interp_2px(w4, 3, w0, 1, 2);
+ else if (cond09)
+ *dst01 = w4;
+ else if (cond10)
+ *dst01 = interp_3px(w4, 5, w1, 2, w3, 1, 3);
+ else if (P(0x0b,0x08))
+ *dst01 = interp_3px(w4, 5, w1, 2, w0, 1, 3);
+ else if (cond11)
+ *dst01 = interp_2px(w4, 5, w1, 3, 3);
+ else if (cond04)
+ *dst01 = interp_2px(w1, 3, w4, 1, 2);
+ else if (cond12)
+ *dst01 = interp_3px(w1, 2, w4, 1, w3, 1, 2);
+ else if (cond13)
+ *dst01 = interp_2px(w1, 5, w3, 3, 3);
+ else if (cond05)
+ *dst01 = interp_2px(w4, 7, w3, 1, 3);
+ else if (P(0xf3,0x62) || P(0x67,0x66) || P(0x37,0x36) || P(0xf3,0xf2) ||
+ P(0xd7,0xd6) || P(0xd7,0x16) || P(0x0b,0x02))
+ *dst01 = interp_2px(w4, 3, w0, 1, 2);
+ else if (cond14)
+ *dst01 = interp_2px(w1, 1, w4, 1, 1);
+ else
+ *dst01 = interp_2px(w4, 3, w1, 1, 2);
+
+ if (cond01)
+ *dst10 = interp_2px(w4, 7, w1, 1, 3);
+ else if (cond08)
+ *dst10 = w4;
+ else if (cond02)
+ *dst10 = interp_2px(w4, 3, w0, 1, 2);
+ else if (cond09)
+ *dst10 = w4;
+ else if (cond10)
+ *dst10 = interp_3px(w4, 5, w3, 2, w1, 1, 3);
+ else if (P(0x0b,0x02))
+ *dst10 = interp_3px(w4, 5, w3, 2, w0, 1, 3);
+ else if (cond15)
+ *dst10 = interp_2px(w4, 5, w3, 3, 3);
+ else if (cond03)
+ *dst10 = interp_2px(w3, 3, w4, 1, 2);
+ else if (cond13)
+ *dst10 = interp_3px(w3, 2, w4, 1, w1, 1, 2);
+ else if (cond12)
+ *dst10 = interp_2px(w3, 5, w1, 3, 3);
+ else if (cond06)
+ *dst10 = interp_2px(w4, 7, w1, 1, 3);
+ else if (P(0x0b,0x08) || P(0xf9,0x68) || P(0x6d,0x6c) || P(0x3d,0x3c) ||
+ P(0xf9,0xf8) || P(0xdd,0xdc) || P(0xdd,0x1c))
+ *dst10 = interp_2px(w4, 3, w0, 1, 2);
+ else if (cond14)
+ *dst10 = interp_2px(w3, 1, w4, 1, 1);
+ else
+ *dst10 = interp_2px(w4, 3, w3, 1, 2);
+
+ if ((P(0x7f,0x2b) || P(0xef,0xab) || P(0xbf,0x8f) || P(0x7f,0x0f)) &&
+ WDIFF(w3, w1))
+ *dst11 = w4;
+ else if (cond02)
+ *dst11 = interp_2px(w4, 7, w0, 1, 3);
+ else if (cond15)
+ *dst11 = interp_2px(w4, 7, w3, 1, 3);
+ else if (cond11)
+ *dst11 = interp_2px(w4, 7, w1, 1, 3);
+ else if (P(0x0a,0x00) || P(0x7e,0x2a) || P(0xef,0xab) || P(0xbf,0x8f) ||
+ P(0x7e,0x0e))
+ *dst11 = interp_3px(w4, 6, w3, 1, w1, 1, 3);
+ else if (cond07)
+ *dst11 = interp_2px(w4, 7, w0, 1, 3);
+ else
+ *dst11 = w4;
+}
+
+static av_always_inline void hqx_filter(const ThreadData *td, int jobnr, int nb_jobs, int n)
+{
+ int x, y, k;
+ AVFrame *in = td->in, *out = td->out;
+ const uint32_t *r2y = td->rgbtoyuv;
+ const int height = in->height;
+ const int width = in->width;
+ const int slice_start = (height * jobnr ) / nb_jobs;
+ const int slice_end = (height * (jobnr+1)) / nb_jobs;
+ const int dst_linesize = out->linesize[0];
+ const int src_linesize = in->linesize[0];
+ uint8_t *dst = out->data[0] + slice_start * dst_linesize * n;
+ const uint8_t *src = in->data[0] + slice_start * src_linesize;
+
+ const int dst32_linesize = dst_linesize >> 2;
+ const int src32_linesize = src_linesize >> 2;
+
+ for (y = slice_start; y < slice_end; y++) {
+ const uint32_t *src32 = (const uint32_t *)src;
+ uint32_t *dst32 = (uint32_t *)dst;
+ const int prevline = y > 0 ? -src32_linesize : 0;
+ const int nextline = y < height - 1 ? src32_linesize : 0;
+
+ for (x = 0; x < width; x++) {
+ uint32_t yuv1, yuv2;
+ const int prevcol = x > 0 ? -1 : 0;
+ const int nextcol = x < width -1 ? 1 : 0;
+ int pattern = 0, flag = 1;
+ const uint32_t w[3*3] = {
+ src32[prevcol + prevline], src32[prevline], src32[prevline + nextcol],
+ src32[prevcol ], src32[ 0], src32[ nextcol],
+ src32[prevcol + nextline], src32[nextline], src32[nextline + nextcol]
+ };
+
+ yuv1 = rgb2yuv(r2y, w[4]);
+
+ for (k = 0; k < FF_ARRAY_ELEMS(w); k++) {
+ if (k == 4)
+ continue;
+ if (w[k] != w[4]) {
+ yuv2 = rgb2yuv(r2y, w[k]);
+ if (yuv_diff(yuv1, yuv2))
+ pattern |= flag;
+ }
+ flag <<= 1;
+ }
+
+ if (n == 2) {
+ dst32[dst32_linesize*0 + 0] = hq2x_interp_1x1(r2y, pattern, w, 0,1,2,3,4,5,6,7,8); // 00
+ dst32[dst32_linesize*0 + 1] = hq2x_interp_1x1(r2y, pattern, w, 2,1,0,5,4,3,8,7,6); // 01 (vert mirrored)
+ dst32[dst32_linesize*1 + 0] = hq2x_interp_1x1(r2y, pattern, w, 6,7,8,3,4,5,0,1,2); // 10 (horiz mirrored)
+ dst32[dst32_linesize*1 + 1] = hq2x_interp_1x1(r2y, pattern, w, 8,7,6,5,4,3,2,1,0); // 11 (center mirrored)
+ } else if (n == 3) {
+ hq3x_interp_2x1(dst32, dst32_linesize, r2y, pattern, w, 0,1, 0,1,2,3,4,5,6,7,8, 0); // 00 01
+ hq3x_interp_2x1(dst32 + 1, dst32_linesize, r2y, pattern, w, 1,3, 2,5,8,1,4,7,0,3,6, 1); // 02 12 (rotated to the right)
+ hq3x_interp_2x1(dst32 + 1*dst32_linesize, dst32_linesize, r2y, pattern, w, 2,0, 6,3,0,7,4,1,8,5,2, 1); // 20 10 (rotated to the left)
+ hq3x_interp_2x1(dst32 + 1*dst32_linesize + 1, dst32_linesize, r2y, pattern, w, 3,2, 8,7,6,5,4,3,2,1,0, 0); // 22 21 (center mirrored)
+ dst32[dst32_linesize + 1] = w[4]; // 11
+ } else if (n == 4) {
+ hq4x_interp_2x2(dst32, dst32_linesize, r2y, pattern, w, 0,1,2,3, 0,1,2,3,4,5,6,7,8); // 00 01 10 11
+ hq4x_interp_2x2(dst32 + 2, dst32_linesize, r2y, pattern, w, 1,0,3,2, 2,1,0,5,4,3,8,7,6); // 02 03 12 13 (vert mirrored)
+ hq4x_interp_2x2(dst32 + 2*dst32_linesize, dst32_linesize, r2y, pattern, w, 2,3,0,1, 6,7,8,3,4,5,0,1,2); // 20 21 30 31 (horiz mirrored)
+ hq4x_interp_2x2(dst32 + 2*dst32_linesize + 2, dst32_linesize, r2y, pattern, w, 3,2,1,0, 8,7,6,5,4,3,2,1,0); // 22 23 32 33 (center mirrored)
+ } else {
+ av_assert0(0);
+ }
+
+ src32 += 1;
+ dst32 += n;
+ }
+
+ src += src_linesize;
+ dst += dst_linesize * n;
+ }
+}
+
+#define HQX_FUNC(size) \
+static int hq##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
+{ \
+ hqx_filter(arg, jobnr, nb_jobs, size); \
+ return 0; \
+}
+
+HQX_FUNC(2)
+HQX_FUNC(3)
+HQX_FUNC(4)
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE};
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ HQXContext *hqx = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+
+ outlink->w = inlink->w * hqx->n;
+ outlink->h = inlink->h * hqx->n;
+ av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",
+ av_get_pix_fmt_name(inlink->format),
+ inlink->w, inlink->h, outlink->w, outlink->h);
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ HQXContext *hqx = ctx->priv;
+ ThreadData td;
+ AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out, in);
+ out->width = outlink->w;
+ out->height = outlink->h;
+
+ td.in = in;
+ td.out = out;
+ td.rgbtoyuv = hqx->rgbtoyuv;
+ ctx->internal->execute(ctx, hqx->func, &td, NULL, FFMIN(inlink->h, ctx->graph->nb_threads));
+
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ HQXContext *hqx = ctx->priv;
+ static const hqxfunc_t hqxfuncs[] = {hq2x, hq3x, hq4x};
+
+ uint32_t c;
+ for (c = 0; c < FF_ARRAY_ELEMS(hqx->rgbtoyuv); c++) {
+ const uint32_t r = c >> 16 & 0xff;
+ const uint32_t g = c >> 8 & 0xff;
+ const uint32_t b = c & 0xff;
+ const uint32_t y = (uint32_t)( 0.299*r + 0.587*g + 0.114*b);
+ const uint32_t u = (uint32_t)(-0.169*r - 0.331*g + 0.5*b) + 128;
+ const uint32_t v = (uint32_t)( 0.5*r - 0.419*g - 0.081*b) + 128;
+ hqx->rgbtoyuv[c] = (y << 16) + (u << 8) + v;
+ }
+
+ hqx->func = hqxfuncs[hqx->n - 2];
+ return 0;
+}
+
+static const AVFilterPad hqx_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad hqx_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_hqx = {
+ .name = "hqx",
+ .description = NULL_IF_CONFIG_SMALL("Scale the input by 2, 3 or 4 using the hq*x magnification algorithm."),
+ .priv_size = sizeof(HQXContext),
+ .init = init,
+ .query_formats = query_formats,
+ .inputs = hqx_inputs,
+ .outputs = hqx_outputs,
+ .priv_class = &hqx_class,
+ .flags = AVFILTER_FLAG_SLICE_THREADS,
+};
diff --git a/tests/fate/filter-video.mak b/tests/fate/filter-video.mak
index 08349ce..011b9f6 100644
--- a/tests/fate/filter-video.mak
+++ b/tests/fate/filter-video.mak
@@ -140,6 +140,13 @@ FATE_FILTER-$(call ALLYES, SMJPEG_DEMUXER MJPEG_DECODER PERMS_FILTER HQDN3D_FILT
fate-filter-hqdn3d-sample: tests/data/filtergraphs/hqdn3d
fate-filter-hqdn3d-sample: CMD = framecrc -idct simple -i $(TARGET_SAMPLES)/smjpeg/scenwin.mjpg -filter_complex_script $(TARGET_PATH)/tests/data/filtergraphs/hqdn3d -an
+FATE_FILTER_HQX-$(call ALLYES, IMAGE2_DEMUXER PNG_DECODER HQX_FILTER) = fate-filter-hq2x fate-filter-hq3x fate-filter-hq4x
+FATE_FILTER-yes += $(FATE_FILTER_HQX-yes)
+fate-filter-hq2x: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf hqx=2
+fate-filter-hq3x: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf hqx=3
+fate-filter-hq4x: CMD = framecrc -i $(TARGET_SAMPLES)/filter/pixelart%d.png -vf hqx=4
+fate-filter-hqx: $(FATE_FILTER_HQX-yes)
+
FATE_FILTER-$(call ALLYES, UTVIDEO_DECODER AVI_DEMUXER PERMS_FILTER CURVES_FILTER) += fate-filter-curves
fate-filter-curves: CMD = framecrc -i $(TARGET_SAMPLES)/utvideo/utvideo_rgb_median.avi -vf perms=random,curves=vintage
diff --git a/tests/ref/fate/filter-hq2x b/tests/ref/fate/filter-hq2x
new file mode 100644
index 0000000..dcf2a29
--- /dev/null
+++ b/tests/ref/fate/filter-hq2x
@@ -0,0 +1,3 @@
+#tb 0: 1/25
+0, 0, 0, 1, 877072, 0x9369339e
+0, 1, 1, 1, 877072, 0x32d119a1
diff --git a/tests/ref/fate/filter-hq3x b/tests/ref/fate/filter-hq3x
new file mode 100644
index 0000000..8215388
--- /dev/null
+++ b/tests/ref/fate/filter-hq3x
@@ -0,0 +1,3 @@
+#tb 0: 1/25
+0, 0, 0, 1, 1973412, 0xafc227fa
+0, 1, 1, 1, 1973412, 0x93aebf19
diff --git a/tests/ref/fate/filter-hq4x b/tests/ref/fate/filter-hq4x
new file mode 100644
index 0000000..c1d6fd8
--- /dev/null
+++ b/tests/ref/fate/filter-hq4x
@@ -0,0 +1,3 @@
+#tb 0: 1/25
+0, 0, 0, 1, 3508288, 0x034ef75e
+0, 1, 1, 1, 3508288, 0x738e9bbb
--
2.0.0
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