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/*
* 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 program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup imbuf
*/
#include "BLI_math.h"
#include "BLI_rect.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
namespace blender::imbuf::transform {
struct TransformUserData {
const ImBuf *src;
ImBuf *dst;
float start_uv[2];
float add_x[2];
float add_y[2];
rctf src_crop;
void init(const float transform_matrix[4][4])
{
init_start_uv(transform_matrix);
init_add_x(transform_matrix);
init_add_y(transform_matrix);
}
private:
void init_start_uv(const float transform_matrix[4][4])
{
float start_uv_v3[3];
float orig[3];
zero_v3(orig);
mul_v3_m4v3(start_uv_v3, transform_matrix, orig);
copy_v2_v2(start_uv, start_uv_v3);
}
void init_add_x(const float transform_matrix[4][4])
{
const int width = src->x;
float add_x_v3[3];
float uv_max_x[3];
zero_v3(uv_max_x);
uv_max_x[0] = width;
uv_max_x[1] = 0.0f;
mul_v3_m4v3(add_x_v3, transform_matrix, uv_max_x);
sub_v2_v2(add_x_v3, start_uv);
mul_v2_fl(add_x_v3, 1.0f / width);
copy_v2_v2(add_x, add_x_v3);
}
void init_add_y(const float transform_matrix[4][4])
{
const int height = src->y;
float add_y_v3[3];
float uv_max_y[3];
zero_v3(uv_max_y);
uv_max_y[0] = 0.0f;
uv_max_y[1] = height;
mul_v3_m4v3(add_y_v3, transform_matrix, uv_max_y);
sub_v2_v2(add_y_v3, start_uv);
mul_v2_fl(add_y_v3, 1.0f / height);
copy_v2_v2(add_y, add_y_v3);
}
};
template<eIMBTransformMode Mode, InterpolationColorFunction ColorInterpolation, int ChannelLen = 4>
class ScanlineProcessor {
private:
void pixel_from_buffer(const struct ImBuf *ibuf, unsigned char **outI, float **outF, int y) const
{
const size_t offset = ((size_t)ibuf->x) * y * ChannelLen;
if (ibuf->rect) {
*outI = (unsigned char *)ibuf->rect + offset;
}
if (ibuf->rect_float) {
*outF = ibuf->rect_float + offset;
}
}
public:
void process(const TransformUserData *user_data, int scanline)
{
const int width = user_data->dst->x;
float uv[2];
madd_v2_v2v2fl(uv, user_data->start_uv, user_data->add_y, scanline);
unsigned char *outI = nullptr;
float *outF = nullptr;
pixel_from_buffer(user_data->dst, &outI, &outF, scanline);
for (int xi = 0; xi < width; xi++) {
if constexpr (Mode == IMB_TRANSFORM_MODE_CROP_SRC) {
if (uv[0] >= user_data->src_crop.xmin && uv[0] < user_data->src_crop.xmax &&
uv[1] >= user_data->src_crop.ymin && uv[1] < user_data->src_crop.ymax) {
ColorInterpolation(user_data->src, outI, outF, uv[0], uv[1]);
}
}
else {
ColorInterpolation(user_data->src, outI, outF, uv[0], uv[1]);
}
add_v2_v2(uv, user_data->add_x);
if (outI) {
outI += ChannelLen;
}
if (outF) {
outF += ChannelLen;
}
}
}
};
template<typename Processor> void transform_scanline_function(void *custom_data, int scanline)
{
const TransformUserData *user_data = static_cast<const TransformUserData *>(custom_data);
Processor processor;
processor.process(user_data, scanline);
}
template<InterpolationColorFunction DefaultFunction, InterpolationColorFunction WrapRepeatFunction>
ScanlineThreadFunc get_scanline_function(const eIMBTransformMode mode)
{
switch (mode) {
case IMB_TRANSFORM_MODE_REGULAR:
return transform_scanline_function<
ScanlineProcessor<IMB_TRANSFORM_MODE_REGULAR, DefaultFunction>>;
case IMB_TRANSFORM_MODE_CROP_SRC:
return transform_scanline_function<
ScanlineProcessor<IMB_TRANSFORM_MODE_CROP_SRC, DefaultFunction>>;
case IMB_TRANSFORM_MODE_WRAP_REPEAT:
return transform_scanline_function<
ScanlineProcessor<IMB_TRANSFORM_MODE_WRAP_REPEAT, WrapRepeatFunction>>;
}
BLI_assert_unreachable();
return nullptr;
}
template<eIMBInterpolationFilterMode Filter>
static void transform(TransformUserData *user_data, const eIMBTransformMode mode)
{
ScanlineThreadFunc scanline_func = nullptr;
if (user_data->dst->rect_float) {
constexpr InterpolationColorFunction interpolation_function =
Filter == IMB_FILTER_NEAREST ? nearest_interpolation_color_fl :
bilinear_interpolation_color_fl;
scanline_func =
get_scanline_function<interpolation_function, nearest_interpolation_color_wrap>(mode);
}
else if (user_data->dst->rect) {
constexpr InterpolationColorFunction interpolation_function =
Filter == IMB_FILTER_NEAREST ? nearest_interpolation_color_char :
bilinear_interpolation_color_char;
scanline_func =
get_scanline_function<interpolation_function, nearest_interpolation_color_wrap>(mode);
}
if (scanline_func != nullptr) {
IMB_processor_apply_threaded_scanlines(user_data->dst->y, scanline_func, user_data);
}
}
} // namespace blender::imbuf::transform
extern "C" {
using namespace blender::imbuf::transform;
void IMB_transform(const struct ImBuf *src,
struct ImBuf *dst,
const eIMBTransformMode mode,
const eIMBInterpolationFilterMode filter,
const float transform_matrix[4][4],
const struct rctf *src_crop)
{
BLI_assert_msg(mode != IMB_TRANSFORM_MODE_CROP_SRC || src_crop != nullptr,
"No source crop rect given, but crop source is requested. Or source crop rect "
"was given, but crop source was not requested.");
TransformUserData user_data;
user_data.src = src;
user_data.dst = dst;
if (mode == IMB_TRANSFORM_MODE_CROP_SRC) {
user_data.src_crop = *src_crop;
}
user_data.init(transform_matrix);
if (filter == IMB_FILTER_NEAREST) {
transform<IMB_FILTER_NEAREST>(&user_data, mode);
}
else {
transform<IMB_FILTER_BILINEAR>(&user_data, mode);
}
}
}
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