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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2020 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bgpencil
*/
#include "BLI_math.h"
#include "BLI_math_vec_types.hh"
#include "BLI_span.hh"
#include "DNA_gpencil_types.h"
#include "BKE_gpencil.h"
#include "BKE_gpencil_geom.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
#include "ED_gpencil.h"
#include "gpencil_io.h"
#include "gpencil_io_import_svg.hh"
/* Custom flags for NanoSVG. */
#define NANOSVG_ALL_COLOR_KEYWORDS
#define NANOSVG_IMPLEMENTATION
#include "nanosvg.h"
using blender::MutableSpan;
namespace blender::io::gpencil {
/* Constructor. */
GpencilImporterSVG::GpencilImporterSVG(const char *filepath, const GpencilIOParams *iparams)
: GpencilImporter(iparams)
{
filepath_set(filepath);
}
bool GpencilImporterSVG::read()
{
bool result = true;
NSVGimage *svg_data = nullptr;
svg_data = nsvgParseFromFile(filepath_, "mm", 96.0f);
if (svg_data == nullptr) {
std::cout << " Could not open SVG.\n ";
return false;
}
/* Create grease pencil object. */
params_.ob = create_object();
if (params_.ob == nullptr) {
std::cout << "Unable to create new object.\n";
nsvgDelete(svg_data);
return false;
}
gpd_ = (bGPdata *)params_.ob->data;
/* Grease pencil is rotated 90 degrees in X axis by default. */
float matrix[4][4];
const float3 scale = float3(params_.scale);
unit_m4(matrix);
rotate_m4(matrix, 'X', DEG2RADF(-90.0f));
rescale_m4(matrix, scale);
/* Loop all shapes. */
char prv_id[70] = {"*"};
int prefix = 0;
for (NSVGshape *shape = svg_data->shapes; shape; shape = shape->next) {
char *layer_id = (shape->id_parent[0] == '\0') ? BLI_sprintfN("Layer_%03d", prefix) :
BLI_sprintfN("%s", shape->id_parent);
if (!STREQ(prv_id, layer_id)) {
prefix++;
MEM_freeN(layer_id);
layer_id = (shape->id_parent[0] == '\0') ? BLI_sprintfN("Layer_%03d", prefix) :
BLI_sprintfN("%s", shape->id_parent);
strcpy(prv_id, layer_id);
}
/* Check if the layer exist and create if needed. */
bGPDlayer *gpl = (bGPDlayer *)BLI_findstring(
&gpd_->layers, layer_id, offsetof(bGPDlayer, info));
if (gpl == nullptr) {
gpl = BKE_gpencil_layer_addnew(gpd_, layer_id, true, false);
/* Disable lights. */
gpl->flag &= ~GP_LAYER_USE_LIGHTS;
}
MEM_freeN(layer_id);
/* Check frame. */
bGPDframe *gpf = BKE_gpencil_layer_frame_get(gpl, cfra_, GP_GETFRAME_ADD_NEW);
/* Create materials. */
bool is_stroke = bool(shape->stroke.type);
bool is_fill = bool(shape->fill.type);
if ((!is_stroke) && (!is_fill)) {
is_stroke = true;
}
/* Create_shape materials. */
const char *const mat_names[] = {"Stroke", "Fill", "Both"};
int index = 0;
if ((is_stroke) && (!is_fill)) {
index = 0;
}
else if ((!is_stroke) && (is_fill)) {
index = 1;
}
else if ((is_stroke) && (is_fill)) {
index = 2;
}
int32_t mat_index = create_material(mat_names[index], is_stroke, is_fill);
/* Loop all paths to create the stroke data. */
for (NSVGpath *path = shape->paths; path; path = path->next) {
create_stroke(gpd_, gpf, shape, path, mat_index, matrix);
}
}
/* Free SVG memory. */
nsvgDelete(svg_data);
/* Calculate bounding box and move all points to new origin center. */
float gp_center[3];
BKE_gpencil_centroid_3d(gpd_, gp_center);
LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd_->layers) {
LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
for (bGPDspoint &pt : MutableSpan(gps->points, gps->totpoints)) {
sub_v3_v3(&pt.x, gp_center);
}
/* Calc stroke bounding box. */
BKE_gpencil_stroke_boundingbox_calc(gps);
}
}
}
return result;
}
void GpencilImporterSVG::create_stroke(bGPdata *gpd,
bGPDframe *gpf,
NSVGshape *shape,
NSVGpath *path,
const int32_t mat_index,
const float matrix[4][4])
{
const bool is_stroke = bool(shape->stroke.type);
const bool is_fill = bool(shape->fill.type);
const int edges = params_.resolution;
const float step = 1.0f / float(edges - 1);
const int totpoints = (path->npts / 3) * params_.resolution;
bGPDstroke *gps = BKE_gpencil_stroke_new(mat_index, totpoints, 1.0f);
BLI_addtail(&gpf->strokes, gps);
if (path->closed == '1') {
gps->flag |= GP_STROKE_CYCLIC;
}
if (is_stroke) {
gps->thickness = shape->strokeWidth * params_.scale;
}
/* Apply Fill vertex color. */
if (is_fill) {
NSVGpaint fill = shape->fill;
convert_color(fill.color, gps->vert_color_fill);
gps->fill_opacity_fac = gps->vert_color_fill[3];
gps->vert_color_fill[3] = 1.0f;
}
int start_index = 0;
for (int i = 0; i < path->npts - 1; i += 3) {
float *p = &path->pts[i * 2];
float a = 0.0f;
for (int v = 0; v < edges; v++) {
bGPDspoint *pt = &gps->points[start_index];
pt->strength = shape->opacity;
pt->pressure = 1.0f;
pt->z = 0.0f;
/* TODO(antoniov): Can be improved loading curve data instead of loading strokes. */
interp_v2_v2v2v2v2_cubic(&pt->x, &p[0], &p[2], &p[4], &p[6], a);
/* Scale from millimeters. */
mul_v3_fl(&pt->x, 0.001f);
mul_m4_v3(matrix, &pt->x);
/* Apply color to vertex color. */
if (is_fill) {
NSVGpaint fill = shape->fill;
convert_color(fill.color, pt->vert_color);
}
if (is_stroke) {
NSVGpaint stroke = shape->stroke;
convert_color(stroke.color, pt->vert_color);
gps->fill_opacity_fac = pt->vert_color[3];
}
pt->vert_color[3] = 1.0f;
a += step;
start_index++;
}
}
/* Cleanup and recalculate geometry. */
BKE_gpencil_stroke_merge_distance(gpd, gpf, gps, 0.001f, true);
BKE_gpencil_stroke_geometry_update(gpd, gps);
}
/* Unpack internal NanoSVG color. */
static void unpack_nano_color(const uint pack, float r_col[4])
{
uchar rgb_u[4];
rgb_u[0] = ((pack) >> 0) & 0xFF;
rgb_u[1] = ((pack) >> 8) & 0xFF;
rgb_u[2] = ((pack) >> 16) & 0xFF;
rgb_u[3] = ((pack) >> 24) & 0xFF;
r_col[0] = float(rgb_u[0]) / 255.0f;
r_col[1] = float(rgb_u[1]) / 255.0f;
r_col[2] = float(rgb_u[2]) / 255.0f;
r_col[3] = float(rgb_u[3]) / 255.0f;
}
void GpencilImporterSVG::convert_color(const int32_t color, float r_linear_rgba[4])
{
float rgba[4];
unpack_nano_color(color, rgba);
srgb_to_linearrgb_v3_v3(r_linear_rgba, rgba);
r_linear_rgba[3] = rgba[3];
}
} // namespace blender::io::gpencil
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