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RetroArch/gfx/video_filters/lq2x.c
libretroadmin 7ebab640d7 Cleanups/style nits
2023-02-23 13:15:14 +01:00

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "softfilter.h"
#include <stdlib.h>
#ifdef RARCH_INTERNAL
#define softfilter_get_implementation lq2x_get_implementation
#define softfilter_thread_data lq2x_softfilter_thread_data
#define filter_data lq2x_filter_data
#endif
#define LQ2X_SCALE 2
struct softfilter_thread_data
{
void *out_data;
const void *in_data;
size_t out_pitch;
size_t in_pitch;
unsigned colfmt;
unsigned width;
unsigned height;
int first;
int last;
};
struct filter_data
{
unsigned threads;
struct softfilter_thread_data *workers;
unsigned in_fmt;
};
static unsigned lq2x_generic_input_fmts(void)
{
return SOFTFILTER_FMT_RGB565 | SOFTFILTER_FMT_XRGB8888;
}
static unsigned lq2x_generic_output_fmts(unsigned input_fmts)
{
return input_fmts;
}
static unsigned lq2x_generic_threads(void *data)
{
struct filter_data *filt = (struct filter_data*)data;
return filt->threads;
}
static void *lq2x_generic_create(const struct softfilter_config *config,
unsigned in_fmt, unsigned out_fmt,
unsigned max_width, unsigned max_height,
unsigned threads, softfilter_simd_mask_t simd, void *userdata)
{
struct filter_data *filt = (struct filter_data*)calloc(1, sizeof(*filt));
if (!filt)
return NULL;
if (!(filt->workers = (struct softfilter_thread_data*)
calloc(threads, sizeof(struct softfilter_thread_data))))
{
free(filt);
return NULL;
}
/* Apparently the code is not thread-safe,
* so force single threaded operation... */
filt->threads = 1;
filt->in_fmt = in_fmt;
return filt;
}
static void lq2x_generic_output(void *data,
unsigned *out_width, unsigned *out_height,
unsigned width, unsigned height)
{
*out_width = width * LQ2X_SCALE;
*out_height = height * LQ2X_SCALE;
}
static void lq2x_generic_destroy(void *data)
{
struct filter_data *filt = (struct filter_data*)data;
if (!filt)
return;
free(filt->workers);
free(filt);
}
static void lq2x_generic_rgb565(unsigned width, unsigned height,
int first, int last, uint16_t *src,
unsigned src_stride, uint16_t *dst, unsigned dst_stride)
{
unsigned x, y;
uint16_t *out0 = (uint16_t*)dst;
uint16_t *out1 = (uint16_t*)(dst + dst_stride);
for (y = 0; y < height; y++)
{
int prevline = (y == 0 ? 0 : src_stride);
int nextline = (y == height - 1 || last) ? 0 : src_stride;
for (x = 0; x < width; x++)
{
uint16_t A = *(src - prevline);
uint16_t B = (x > 0) ? *(src - 1) : *src;
uint16_t C = *src;
uint16_t D = (x < width - 1) ? *(src + 1) : *src;
uint16_t E = *(src++ + nextline);
uint16_t c = C;
if (A != E && B != D)
{
*out0++ = (A == B ? ((C + A - ((C ^ A) & 0x0821)) >> 1) : c);
*out0++ = (A == D ? ((C + A - ((C ^ A) & 0x0821)) >> 1) : c);
*out1++ = (E == B ? ((C + E - ((C ^ E) & 0x0821)) >> 1) : c);
*out1++ = (E == D ? ((C + E - ((C ^ E) & 0x0821)) >> 1) : c);
}
else
{
*out0++ = c;
*out0++ = c;
*out1++ = c;
*out1++ = c;
}
}
src += src_stride - width;
out0 += dst_stride + dst_stride - (width << 1);
out1 += dst_stride + dst_stride - (width << 1);
}
}
static void lq2x_generic_xrgb8888(unsigned width, unsigned height,
int first, int last, uint32_t *src,
unsigned src_stride, uint32_t *dst, unsigned dst_stride)
{
unsigned x, y;
uint32_t *out0 = (uint32_t*)dst;
uint32_t *out1 = (uint32_t*)(dst + dst_stride);
for (y = 0; y < height; y++)
{
int prevline = (y == 0 ? 0 : src_stride);
int nextline = (y == height - 1 || last) ? 0 : src_stride;
for (x = 0; x < width; x++)
{
uint32_t A = *(src - prevline);
uint32_t B = (x > 0) ? *(src - 1) : *src;
uint32_t C = *src;
uint32_t D = (x < width - 1) ? *(src + 1) : *src;
uint32_t E = *(src++ + nextline);
uint32_t c = C;
if (A != E && B != D)
{
*out0++ = (A == B ? (C + A - ((C ^ A) & 0x0421)) >> 1 : c);
*out0++ = (A == D ? (C + A - ((C ^ A) & 0x0421)) >> 1 : c);
*out1++ = (E == B ? (C + E - ((C ^ E) & 0x0421)) >> 1 : c);
*out1++ = (E == D ? (C + E - ((C ^ E) & 0x0421)) >> 1 : c);
}
else
{
*out0++ = c;
*out0++ = c;
*out1++ = c;
*out1++ = c;
}
}
src += src_stride - width;
out0 += dst_stride + dst_stride - (width << 1);
out1 += dst_stride + dst_stride - (width << 1);
}
}
static void lq2x_work_cb_rgb565(void *data, void *thread_data)
{
struct softfilter_thread_data *thr =
(struct softfilter_thread_data*)thread_data;
uint16_t *input = (uint16_t*)thr->in_data;
uint16_t *output = (uint16_t*)thr->out_data;
unsigned width = thr->width;
unsigned height = thr->height;
lq2x_generic_rgb565(width, height,
thr->first, thr->last, input,
(unsigned)(thr->in_pitch / SOFTFILTER_BPP_RGB565),
output,
(unsigned)(thr->out_pitch / SOFTFILTER_BPP_RGB565));
}
static void lq2x_work_cb_xrgb8888(void *data, void *thread_data)
{
struct softfilter_thread_data *thr =
(struct softfilter_thread_data*)thread_data;
uint32_t *input = (uint32_t*)thr->in_data;
uint32_t *output = (uint32_t*)thr->out_data;
unsigned width = thr->width;
unsigned height = thr->height;
lq2x_generic_xrgb8888(width, height,
thr->first, thr->last, input,
(unsigned)(thr->in_pitch / SOFTFILTER_BPP_XRGB8888),
output,
(unsigned)(thr->out_pitch / SOFTFILTER_BPP_XRGB8888));
}
static void lq2x_generic_packets(void *data,
struct softfilter_work_packet *packets,
void *output, size_t output_stride,
const void *input, unsigned width,
unsigned height, size_t input_stride)
{
struct filter_data *filt = (struct filter_data*)data;
unsigned i;
for (i = 0; i < filt->threads; i++)
{
struct softfilter_thread_data *thr =
(struct softfilter_thread_data*)&filt->workers[i];
unsigned y_start = (height * i) / filt->threads;
unsigned y_end = (height * (i + 1)) / filt->threads;
thr->out_data = (uint8_t*)output + y_start * LQ2X_SCALE * output_stride;
thr->in_data = (const uint8_t*)input + y_start * input_stride;
thr->out_pitch = output_stride;
thr->in_pitch = input_stride;
thr->width = width;
thr->height = y_end - y_start;
/* Workers need to know if they can access pixels
* outside their given buffer. */
thr->first = y_start;
thr->last = y_end == height;
if (filt->in_fmt == SOFTFILTER_FMT_RGB565)
packets[i].work = lq2x_work_cb_rgb565;
#if 0
else if (filt->in_fmt == SOFTFILTER_FMT_RGB4444)
packets[i].work = lq2x_work_cb_rgb4444;
#endif
else if (filt->in_fmt == SOFTFILTER_FMT_XRGB8888)
packets[i].work = lq2x_work_cb_xrgb8888;
packets[i].thread_data = thr;
}
}
static const struct softfilter_implementation lq2x_generic = {
lq2x_generic_input_fmts,
lq2x_generic_output_fmts,
lq2x_generic_create,
lq2x_generic_destroy,
lq2x_generic_threads,
lq2x_generic_output,
lq2x_generic_packets,
SOFTFILTER_API_VERSION,
"LQ2x",
"lq2x",
};
const struct softfilter_implementation *softfilter_get_implementation(
softfilter_simd_mask_t simd)
{
return &lq2x_generic;
}
#ifdef RARCH_INTERNAL
#undef softfilter_get_implementation
#undef softfilter_thread_data
#undef filter_data
#endif
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