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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup edtransform
*/
#include <stdlib.h>
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BKE_context.h"
#include "ED_screen.h"
#include "ED_transform.h"
#include "UI_view2d.h"
#include "SEQ_channels.h"
#include "SEQ_effects.h"
#include "SEQ_iterator.h"
#include "SEQ_relations.h"
#include "SEQ_render.h"
#include "SEQ_sequencer.h"
#include "SEQ_time.h"
#include "transform.h"
#include "transform_convert.h"
#include "transform_snap.h"
typedef struct TransSeqSnapData {
int *source_snap_points;
int *target_snap_points;
int source_snap_point_count;
int target_snap_point_count;
} TransSeqSnapData;
/* -------------------------------------------------------------------- */
/** \name Snap sources
* \{ */
static int seq_get_snap_source_points_len(SeqCollection *snap_sources)
{
return SEQ_collection_len(snap_sources) * 2;
}
static void seq_snap_source_points_alloc(TransSeqSnapData *snap_data, SeqCollection *snap_sources)
{
const size_t point_count = seq_get_snap_source_points_len(snap_sources);
snap_data->source_snap_points = MEM_callocN(sizeof(int) * point_count, __func__);
memset(snap_data->source_snap_points, 0, sizeof(int));
snap_data->source_snap_point_count = point_count;
}
static int cmp_fn(const void *a, const void *b)
{
return (*(int *)a - *(int *)b);
}
static void seq_snap_source_points_build(const Scene *scene,
TransSeqSnapData *snap_data,
SeqCollection *snap_sources)
{
int i = 0;
Sequence *seq;
SEQ_ITERATOR_FOREACH (seq, snap_sources) {
int left = 0, right = 0;
if (seq->flag & SEQ_LEFTSEL) {
left = right = SEQ_time_left_handle_frame_get(scene, seq);
}
else if (seq->flag & SEQ_RIGHTSEL) {
left = right = SEQ_time_right_handle_frame_get(scene, seq);
}
else {
left = SEQ_time_left_handle_frame_get(scene, seq);
right = SEQ_time_right_handle_frame_get(scene, seq);
}
snap_data->source_snap_points[i] = left;
snap_data->source_snap_points[i + 1] = right;
i += 2;
BLI_assert(i <= snap_data->source_snap_point_count);
}
qsort(snap_data->source_snap_points, snap_data->source_snap_point_count, sizeof(int), cmp_fn);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Snap targets
* \{ */
/* Add effect strips directly or indirectly connected to `seq_reference` to `collection`. */
static void query_strip_effects_fn(const Scene *scene,
Sequence *seq_reference,
ListBase *seqbase,
SeqCollection *collection)
{
if (!SEQ_collection_append_strip(seq_reference, collection)) {
return; /* Strip is already in set, so all effects connected to it are as well. */
}
/* Find all strips connected to `seq_reference`. */
LISTBASE_FOREACH (Sequence *, seq_test, seqbase) {
if (SEQ_relation_is_effect_of_strip(seq_test, seq_reference)) {
query_strip_effects_fn(scene, seq_test, seqbase, collection);
}
}
}
static SeqCollection *seq_collection_extract_effects(SeqCollection *collection)
{
SeqCollection *effects = SEQ_collection_create(__func__);
Sequence *seq;
SEQ_ITERATOR_FOREACH (seq, collection) {
if (SEQ_effect_get_num_inputs(seq->type) > 0) {
SEQ_collection_append_strip(seq, effects);
}
}
return effects;
}
static SeqCollection *query_snap_targets(Scene *scene,
SeqCollection *snap_sources,
bool exclude_selected)
{
Editing *ed = SEQ_editing_get(scene);
ListBase *seqbase = SEQ_active_seqbase_get(ed);
ListBase *channels = SEQ_channels_displayed_get(ed);
const short snap_flag = SEQ_tool_settings_snap_flag_get(scene);
SeqCollection *snap_targets = SEQ_collection_create(__func__);
LISTBASE_FOREACH (Sequence *, seq, seqbase) {
if (exclude_selected && seq->flag & SELECT) {
continue; /* Selected are being transformed. */
}
if (SEQ_render_is_muted(channels, seq) && (snap_flag & SEQ_SNAP_IGNORE_MUTED)) {
continue;
}
if (seq->type == SEQ_TYPE_SOUND_RAM && (snap_flag & SEQ_SNAP_IGNORE_SOUND)) {
continue;
}
SEQ_collection_append_strip(seq, snap_targets);
}
/* Effects will always change position with strip to which they are connected and they don't have
* to be selected. Remove such strips from `snap_targets` collection. */
SeqCollection *snap_sources_temp = SEQ_collection_duplicate(snap_sources);
SEQ_collection_expand(scene, seqbase, snap_sources_temp, query_strip_effects_fn);
SeqCollection *snap_sources_effects = seq_collection_extract_effects(snap_sources_temp);
SEQ_collection_exclude(snap_targets, snap_sources_effects);
SEQ_collection_free(snap_sources_temp);
return snap_targets;
}
static int seq_get_snap_target_points_count(short snap_mode, SeqCollection *snap_targets)
{
int count = 2; /* Strip start and end are always used. */
if (snap_mode & SEQ_SNAP_TO_STRIP_HOLD) {
count += 2;
}
count *= SEQ_collection_len(snap_targets);
if (snap_mode & SEQ_SNAP_TO_CURRENT_FRAME) {
count++;
}
return count;
}
static void seq_snap_target_points_alloc(short snap_mode,
TransSeqSnapData *snap_data,
SeqCollection *snap_targets)
{
const size_t point_count = seq_get_snap_target_points_count(snap_mode, snap_targets);
snap_data->target_snap_points = MEM_callocN(sizeof(int) * point_count, __func__);
memset(snap_data->target_snap_points, 0, sizeof(int));
snap_data->target_snap_point_count = point_count;
}
static void seq_snap_target_points_build(Scene *scene,
short snap_mode,
TransSeqSnapData *snap_data,
SeqCollection *snap_targets)
{
int i = 0;
if (snap_mode & SEQ_SNAP_TO_CURRENT_FRAME) {
snap_data->target_snap_points[i] = scene->r.cfra;
i++;
}
Sequence *seq;
SEQ_ITERATOR_FOREACH (seq, snap_targets) {
snap_data->target_snap_points[i] = SEQ_time_left_handle_frame_get(scene, seq);
snap_data->target_snap_points[i + 1] = SEQ_time_right_handle_frame_get(scene, seq);
i += 2;
if (snap_mode & SEQ_SNAP_TO_STRIP_HOLD) {
int content_start = min_ii(SEQ_time_left_handle_frame_get(scene, seq),
SEQ_time_start_frame_get(seq));
int content_end = max_ii(SEQ_time_right_handle_frame_get(scene, seq),
SEQ_time_content_end_frame_get(scene, seq));
/* Effects and single image strips produce incorrect content length. Skip these strips. */
if ((seq->type & SEQ_TYPE_EFFECT) != 0 || seq->len == 1) {
content_start = SEQ_time_left_handle_frame_get(scene, seq);
content_end = SEQ_time_right_handle_frame_get(scene, seq);
}
CLAMP(content_start,
SEQ_time_left_handle_frame_get(scene, seq),
SEQ_time_right_handle_frame_get(scene, seq));
CLAMP(content_end,
SEQ_time_left_handle_frame_get(scene, seq),
SEQ_time_right_handle_frame_get(scene, seq));
snap_data->target_snap_points[i] = content_start;
snap_data->target_snap_points[i + 1] = content_end;
i += 2;
}
}
BLI_assert(i <= snap_data->target_snap_point_count);
qsort(snap_data->target_snap_points, snap_data->target_snap_point_count, sizeof(int), cmp_fn);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Snap utilities
* \{ */
static int seq_snap_threshold_get_frame_distance(const TransInfo *t)
{
const int snap_distance = SEQ_tool_settings_snap_distance_get(t->scene);
const struct View2D *v2d = &t->region->v2d;
return round_fl_to_int(UI_view2d_region_to_view_x(v2d, snap_distance) -
UI_view2d_region_to_view_x(v2d, 0));
}
/** \} */
TransSeqSnapData *transform_snap_sequencer_data_alloc(const TransInfo *t)
{
if (t->data_type == &TransConvertType_SequencerImage) {
return NULL;
}
Scene *scene = t->scene;
TransSeqSnapData *snap_data = MEM_callocN(sizeof(TransSeqSnapData), __func__);
ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
SeqCollection *snap_sources = SEQ_query_selected_strips(seqbase);
SeqCollection *snap_targets = query_snap_targets(scene, snap_sources, true);
if (SEQ_collection_len(snap_sources) == 0) {
SEQ_collection_free(snap_targets);
SEQ_collection_free(snap_sources);
MEM_freeN(snap_data);
return NULL;
}
/* Build arrays of snap points. */
seq_snap_source_points_alloc(snap_data, snap_sources);
seq_snap_source_points_build(scene, snap_data, snap_sources);
SEQ_collection_free(snap_sources);
short snap_mode = t->tsnap.mode;
seq_snap_target_points_alloc(snap_mode, snap_data, snap_targets);
seq_snap_target_points_build(scene, snap_mode, snap_data, snap_targets);
SEQ_collection_free(snap_targets);
return snap_data;
}
void transform_snap_sequencer_data_free(TransSeqSnapData *data)
{
MEM_freeN(data->source_snap_points);
MEM_freeN(data->target_snap_points);
MEM_freeN(data);
}
bool transform_snap_sequencer_calc(TransInfo *t)
{
const TransSeqSnapData *snap_data = t->tsnap.seq_context;
if (snap_data == NULL) {
return false;
}
/* Prevent snapping when constrained to Y axis. */
if (t->con.mode & CON_APPLY && t->con.mode & CON_AXIS1) {
return false;
}
int best_dist = MAXFRAME, best_target_frame = 0, best_source_frame = 0;
for (int i = 0; i < snap_data->source_snap_point_count; i++) {
int snap_source_frame = snap_data->source_snap_points[i] + round_fl_to_int(t->values[0]);
for (int j = 0; j < snap_data->target_snap_point_count; j++) {
int snap_target_frame = snap_data->target_snap_points[j];
int dist = abs(snap_target_frame - snap_source_frame);
if (dist > best_dist) {
continue;
}
best_dist = dist;
best_target_frame = snap_target_frame;
best_source_frame = snap_source_frame;
}
}
if (best_dist > seq_snap_threshold_get_frame_distance(t)) {
return false;
}
t->tsnap.snapPoint[0] = best_target_frame;
t->tsnap.snapTarget[0] = best_source_frame;
return true;
}
void transform_snap_sequencer_apply_translate(TransInfo *t, float *vec)
{
*vec += t->tsnap.snapPoint[0] - t->tsnap.snapTarget[0];
}
static int transform_snap_sequencer_to_closest_strip_ex(TransInfo *t, int frame_1, int frame_2)
{
Scene *scene = t->scene;
TransSeqSnapData *snap_data = MEM_callocN(sizeof(TransSeqSnapData), __func__);
SeqCollection *empty_col = SEQ_collection_create(__func__);
SeqCollection *snap_targets = query_snap_targets(scene, empty_col, false);
SEQ_collection_free(empty_col);
snap_data->source_snap_points = MEM_callocN(sizeof(int) * 2, __func__);
snap_data->source_snap_point_count = 2;
BLI_assert(frame_1 <= frame_2);
snap_data->source_snap_points[0] = frame_1;
snap_data->source_snap_points[1] = frame_2;
short snap_mode = t->tsnap.mode;
/* Build arrays of snap points. */
seq_snap_target_points_alloc(snap_mode, snap_data, snap_targets);
seq_snap_target_points_build(scene, snap_mode, snap_data, snap_targets);
SEQ_collection_free(snap_targets);
t->tsnap.seq_context = snap_data;
bool snap_success = transform_snap_sequencer_calc(t);
transform_snap_sequencer_data_free(snap_data);
t->tsnap.seq_context = NULL;
float snap_offset = 0;
if (snap_success) {
t->tsnap.status |= (POINT_INIT | TARGET_INIT);
transform_snap_sequencer_apply_translate(t, &snap_offset);
}
else {
t->tsnap.status &= ~(POINT_INIT | TARGET_INIT);
}
return snap_offset;
}
bool ED_transform_snap_sequencer_to_closest_strip_calc(Scene *scene,
ARegion *region,
int frame_1,
int frame_2,
int *r_snap_distance,
float *r_snap_frame)
{
TransInfo t;
t.scene = scene;
t.region = region;
t.values[0] = 0;
t.data_type = &TransConvertType_Sequencer;
t.tsnap.mode = SEQ_tool_settings_snap_mode_get(scene);
*r_snap_distance = transform_snap_sequencer_to_closest_strip_ex(&t, frame_1, frame_2);
*r_snap_frame = t.tsnap.snapPoint[0];
return validSnap(&t);
}
void ED_draw_sequencer_snap_point(struct bContext *C, float snap_point)
{
/* Reuse the snapping drawing code from the transform system. */
TransInfo t;
t.mode = TFM_SEQ_SLIDE;
t.modifiers = MOD_SNAP;
t.spacetype = SPACE_SEQ;
t.tsnap.status = (POINT_INIT | TARGET_INIT);
t.tsnap.snapPoint[0] = snap_point;
drawSnapping(C, &t);
}
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