~ubuntu-branches/ubuntu/maverick/gimp/maverick-updates : revision 1

plug-ins/common/sharpen.c

* "$Id: sharpen.c,v 1.55 2004/12/23 23:58:35 weskaggs Exp $"

* Sharpen filters for The GIMP -- an image manipulation program

* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "config.h"

#include <string.h>

#include <gtk/gtk.h>

#include <libgimp/gimp.h>

#include <libgimp/gimpui.h>

#include "libgimp/stdplugins-intl.h"

* Constants...

#define PLUG_IN_NAME "plug_in_sharpen"

#define PLUG_IN_VERSION "1.4.2 - 3 June 1998"

#define HELP_ID "plug-in-sharpen"

#define SCALE_WIDTH 100

* Local functions...

static void query (void);

static void run (const gchar *name,

gint nparams,

const GimpParam *param,

gint *nreturn_vals,

GimpParam **returm_vals);

static void compute_luts (void);

static void sharpen (GimpDrawable *drawable);

static gboolean sharpen_dialog (GimpDrawable *drawable);

static void preview_update (GimpPreview *preview);

typedef gint32 intneg;

typedef gint32 intpos;

static void gray_filter (int width, guchar *src, guchar *dst, intneg *neg0,

intneg *neg1, intneg *neg2);

static void graya_filter (int width, guchar *src, guchar *dst, intneg *neg0,

intneg *neg1, intneg *neg2);

static void rgb_filter (int width, guchar *src, guchar *dst, intneg *neg0,

intneg *neg1, intneg *neg2);

static void rgba_filter (int width, guchar *src, guchar *dst, intneg *neg0,

intneg *neg1, intneg *neg2);

* Globals...

GimpPlugInInfo PLUG_IN_INFO =

{

NULL, /* init_proc */

NULL, /* quit_proc */

query, /* query_proc */

run /* run_proc */

};

typedef struct

{

gint sharpen_percent;

gboolean update_preview;

} SharpenParams;

static SharpenParams sharpen_params =

{

10,

TRUE

};

static intneg neg_lut[256]; /* Negative coefficient LUT */

100

static intpos pos_lut[256]; /* Positive coefficient LUT */

101

102

103

MAIN ()

104

105

static void

106

query (void)

107

{

108

static GimpParamDef args[] =

109

{

110

{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },

111

{ GIMP_PDB_IMAGE, "image", "Input image" },

112

{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },

113

{ GIMP_PDB_INT32, "percent", "Percent sharpening (default = 10)" }

114

};

115

116

gimp_install_procedure (PLUG_IN_NAME,

117

"Sharpen filter, typically used to 'sharpen' a "

118

"photographic image.",

119

"This plug-in selectively performs a convolution "

120

"filter on an image.",

121

"Michael Sweet <mike@easysw.com>",

122

123

PLUG_IN_VERSION,

124

N_("_Sharpen..."),

125

"RGB*, GRAY*",

126

GIMP_PLUGIN,

127

G_N_ELEMENTS (args), 0,

128

args, NULL);

129

130

gimp_plugin_menu_register (PLUG_IN_NAME, "<Image>/Filters/Enhance");

131

}

132

133

static void

134

run (const gchar *name,

135

gint nparams,

136

const GimpParam *param,

137

gint *nreturn_vals,

138

GimpParam **return_vals)

139

{

140

GimpRunMode run_mode; /* Current run mode */

141

GimpPDBStatusType status; /* Return status */

142

GimpParam *values; /* Return values */

143

GimpDrawable *drawable; /* Current image */

144

145

146

* Initialize parameter data...

147

148

149

status = GIMP_PDB_SUCCESS;

150

run_mode = param[0].data.d_int32;

151

152

INIT_I18N ();

153

154

values = g_new (GimpParam, 1);

155

156

*nreturn_vals = 1;

157

*return_vals = values;

158

159

values[0].type = GIMP_PDB_STATUS;

160

values[0].data.d_status = status;

161

162

163

* Get drawable information...

164

165

166

drawable = gimp_drawable_get (param[2].data.d_drawable);

167

gimp_tile_cache_ntiles (2 * drawable->ntile_cols);

168

169

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171

* See how we will run

172

173

174

switch (run_mode)

175

{

176

case GIMP_RUN_INTERACTIVE:

177

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* Possibly retrieve data...

179

180

gimp_get_data (PLUG_IN_NAME, &sharpen_params);

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182

183

* Get information from the dialog...

184

185

if (!sharpen_dialog (drawable))

186

return;

187

break;

188

189

case GIMP_RUN_NONINTERACTIVE:

190

191

* Make sure all the arguments are present...

192

193

if (nparams != 4)

194

status = GIMP_PDB_CALLING_ERROR;

195

else

196

sharpen_params.sharpen_percent = param[3].data.d_int32;

197

break;

198

199

case GIMP_RUN_WITH_LAST_VALS:

200

201

* Possibly retrieve data...

202

203

gimp_get_data (PLUG_IN_NAME, &sharpen_params);

204

break;

205

206

default:

207

status = GIMP_PDB_CALLING_ERROR;

208

break;

209

}

210

211

212

* Sharpen the image...

213

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if (status == GIMP_PDB_SUCCESS)

216

{

217

if ((gimp_drawable_is_rgb (drawable->drawable_id) ||

218

gimp_drawable_is_gray (drawable->drawable_id)))

219

{

220

221

* Run!

222

223

sharpen (drawable);

224

225

226

* If run mode is interactive, flush displays...

227

228

if (run_mode != GIMP_RUN_NONINTERACTIVE)

229

gimp_displays_flush ();

230

231

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* Store data...

233

234

if (run_mode == GIMP_RUN_INTERACTIVE)

235

gimp_set_data (PLUG_IN_NAME,

236

&sharpen_params, sizeof (SharpenParams));

237

}

238

else

239

status = GIMP_PDB_EXECUTION_ERROR;

240

}

241

242

243

* Reset the current run status...

244

245

values[0].data.d_status = status;

246

247

248

* Detach from the drawable...

249

250

gimp_drawable_detach (drawable);

251

}

252

253

254

static void

255

compute_luts (void)

256

{

257

gint i; /* Looping var */

258

gint fact; /* 1 - sharpness */

259

260

fact = 100 - sharpen_params.sharpen_percent;

261

if (fact < 1)

262

fact = 1;

263

264

for (i = 0; i < 256; i ++)

265

{

266

pos_lut[i] = 800 * i / fact;

267

neg_lut[i] = (4 + pos_lut[i] - (i << 3)) >> 3;

268

}

269

}

270

271

272

* 'sharpen()' - Sharpen an image using a convolution filter.

273

274

275

static void

276

sharpen (GimpDrawable *drawable)

277

{

278

GimpPixelRgn src_rgn; /* Source image region */

279

GimpPixelRgn dst_rgn; /* Destination image region */

280

guchar *src_rows[4]; /* Source pixel rows */

281

guchar *src_ptr; /* Current source pixel */

282

guchar *dst_row; /* Destination pixel row */

283

intneg *neg_rows[4]; /* Negative coefficient rows */

284

intneg *neg_ptr; /* Current negative coefficient */

285

gint i; /* Looping vars */

286

gint y; /* Current location in image */

287

gint row; /* Current row in src_rows */

288

gint count; /* Current number of filled src_rows */

289

gint width; /* Byte width of the image */

290

gint x1; /* Selection bounds */

291

gint y1;

292

gint x2;

293

gint y2;

294

gint sel_width; /* Selection width */

295

gint sel_height; /* Selection height */

296

gint img_bpp; /* Bytes-per-pixel in image */

297

void (*filter)(int, guchar *, guchar *, intneg *, intneg *, intneg *);

298

299

filter = NULL;

300

301

gimp_drawable_mask_bounds (drawable->drawable_id,

302

&x1, &y1, &x2, &y2);

303

304

sel_width = x2 - x1;

305

sel_height = y2 - y1;

306

img_bpp = gimp_drawable_bpp (drawable->drawable_id);

307

308

309

* Let the user know what we're doing...

310

311

gimp_progress_init( _("Sharpening..."));

312

313

314

* Setup for filter...

315

316

317

gimp_pixel_rgn_init (&src_rgn, drawable,

318

x1, y1, sel_width, sel_height, FALSE, FALSE);

319

gimp_pixel_rgn_init (&dst_rgn, drawable,

320

x1, y1, sel_width, sel_height, TRUE, TRUE);

321

322

compute_luts ();

323

324

width = sel_width * img_bpp;

325

326

for (row = 0; row < 4; row ++)

327

{

328

src_rows[row] = g_new (guchar, width);

329

neg_rows[row] = g_new (intneg, width);

330

}

331

332

dst_row = g_new (guchar, width);

333

334

335

* Pre-load the first row for the filter...

336

337

338

gimp_pixel_rgn_get_row (&src_rgn, src_rows[0], x1, y1, sel_width);

339

340

for (i = width, src_ptr = src_rows[0], neg_ptr = neg_rows[0];

341

i > 0;

342

i --, src_ptr ++, neg_ptr ++)

343

*neg_ptr = neg_lut[*src_ptr];

344

345

row = 1;

346

count = 1;

347

348

349

* Select the filter...

350

351

352

switch (img_bpp)

353

{

354

case 1 :

355

filter = gray_filter;

356

break;

357

case 2 :

358

filter = graya_filter;

359

break;

360

case 3 :

361

filter = rgb_filter;

362

break;

363

case 4 :

364

filter = rgba_filter;

365

break;

366

};

367

368

369

* Sharpen...

370

371

372

for (y = y1; y < y2; y ++)

373

{

374

375

* Load the next pixel row...

376

377

378

if ((y + 1) < y2)

379

{

380

381

* Check to see if our src_rows[] array is overflowing yet...

382

383

384

if (count >= 3)

385

count --;

386

387

388

* Grab the next row...

389

390

391

gimp_pixel_rgn_get_row (&src_rgn, src_rows[row],

392

x1, y + 1, sel_width);

393

for (i = width, src_ptr = src_rows[row], neg_ptr = neg_rows[row];

394

i > 0;

395

i --, src_ptr ++, neg_ptr ++)

396

*neg_ptr = neg_lut[*src_ptr];

397

398

count ++;

399

row = (row + 1) & 3;

400

}

401

else

402

{

403

404

* No more pixels at the bottom... Drop the oldest samples...

405

406

407

count --;

408

}

409

410

411

* Now sharpen pixels and save the results...

412

413

414

if (count == 3)

415

{

416

(* filter) (sel_width, src_rows[(row + 2) & 3], dst_row,

417

neg_rows[(row + 1) & 3] + img_bpp,

418

neg_rows[(row + 2) & 3] + img_bpp,

419

neg_rows[(row + 3) & 3] + img_bpp);

420

421

422

* Set the row...

423

424

425

gimp_pixel_rgn_set_row (&dst_rgn, dst_row, x1, y, sel_width);

426

}

427

else if (count == 2)

428

{

429

if (y == y1) /* first row */

430

gimp_pixel_rgn_set_row (&dst_rgn, src_rows[0],

431

x1, y, sel_width);

432

else /* last row */

433

gimp_pixel_rgn_set_row (&dst_rgn, src_rows[(sel_height - 1) & 3],

434

x1, y, sel_width);

435

}

436

437

if ((y & 15) == 0)

438

gimp_progress_update ((gdouble) (y - y1) / (gdouble) sel_height);

439

}

440

441

442

* OK, we're done. Free all memory used...

443

444

445

for (row = 0; row < 4; row ++)

446

{

447

g_free (src_rows[row]);

448

g_free (neg_rows[row]);

449

}

450

451

g_free (dst_row);

452

453

454

* Update the screen...

455

456

457

gimp_drawable_flush (drawable);

458

gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);

459

gimp_drawable_update (drawable->drawable_id,

460

x1, y1, sel_width, sel_height);

461

}

462

463

464

465

* 'sharpen_dialog()' - Popup a dialog window for the filter box size...

466

467

468

static gboolean

469

sharpen_dialog (GimpDrawable *drawable)

470

{

471

GtkWidget *dialog;

472

GtkWidget *main_vbox;

473

GtkWidget *preview;

474

GtkWidget *table;

475

GtkObject *adj;

476

gboolean run;

477

478

gimp_ui_init ("sharpen", TRUE);

479

480

dialog = gimp_dialog_new (_("Sharpen"), "Sharpen",

481

NULL, 0,

482

gimp_standard_help_func, HELP_ID,

483

484

GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,

485

GTK_STOCK_OK, GTK_RESPONSE_OK,

486

487

NULL);

488

489

main_vbox = gtk_vbox_new (FALSE, 12);

490

gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);

491

gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);

492

gtk_widget_show (main_vbox);

493

494

preview = gimp_drawable_preview_new (drawable,

495

&sharpen_params.update_preview);

496

gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);

497

gtk_widget_show (preview);

498

499

g_signal_connect (preview, "invalidated",

500

G_CALLBACK (preview_update),

501

NULL);

502

503

table = gtk_table_new (1, 3, FALSE);

504

gtk_table_set_col_spacings (GTK_TABLE (table), 6);

505

gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);

506

gtk_widget_show (table);

507

508

adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,

509

_("_Sharpness:"), SCALE_WIDTH, 0,

510

sharpen_params.sharpen_percent,

511

1, 99, 1, 10, 0,

512

TRUE, 0, 0,

513

NULL, NULL);

514

g_signal_connect (adj, "value_changed",

515

G_CALLBACK (gimp_int_adjustment_update),

516

&sharpen_params.sharpen_percent);

517

g_signal_connect_swapped (adj, "value_changed",

518

G_CALLBACK (gimp_preview_invalidate),

519

preview);

520

521

gtk_widget_show (dialog);

522

523

run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);

524

525

gtk_widget_destroy (dialog);

526

527

return run;

528

}

529

530

static void

531

preview_update (GimpPreview *preview)

532

{

533

GimpDrawable *drawable;

534

GimpPixelRgn src_rgn; /* Source image region */

535

guchar *src_ptr; /* Current source pixel */

536

guchar *dst_ptr; /* Current destination pixel */

537

intneg *neg_ptr; /* Current negative pixel */

538

gint i; /* Looping var */

539

gint y; /* Current location in image */

540

gint width; /* Byte width of the image */

541

gint x1, y1;

542

gint preview_width, preview_height;

543

guchar *preview_src, *preview_dst;

544

intneg *preview_neg;

545

gint img_bpp; /* Bytes-per-pixel in image */

546

547

void (*filter)(int, guchar *, guchar *, intneg *, intneg *, intneg *);

548

549

filter = NULL;

550

551

compute_luts();

552

553

gimp_preview_get_position (preview, &x1, &y1);

554

gimp_preview_get_size (preview, &preview_width, &preview_height);

555

556

drawable =

557

gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));

558

559

img_bpp = gimp_drawable_bpp (drawable->drawable_id);

560

561

562

preview_src = g_new (guchar, preview_width * preview_height * img_bpp);

563

preview_neg = g_new (intneg, preview_width * preview_height * img_bpp);

564

preview_dst = g_new (guchar, preview_width * preview_height * img_bpp);

565

566

gimp_pixel_rgn_init (&src_rgn, drawable,

567

x1, y1, preview_width, preview_height,

568

FALSE, FALSE);

569

570

width = preview_width * img_bpp;

571

572

573

* Load the preview area...

574

575

576

gimp_pixel_rgn_get_rect (&src_rgn, preview_src, x1, y1,

577

preview_width, preview_height);

578

579

for (i = width * preview_height, src_ptr = preview_src, neg_ptr = preview_neg;

580

i > 0;

581

i --)

582

*neg_ptr++ = neg_lut[*src_ptr++];

583

584

585

* Select the filter...

586

587

588

switch (img_bpp)

589

{

590

case 1:

591

filter = gray_filter;

592

break;

593

case 2:

594

filter = graya_filter;

595

break;

596

case 3:

597

filter = rgb_filter;

598

break;

599

case 4:

600

filter = rgba_filter;

601

break;

602

}

603

604

605

* Sharpen...

606

607

608

memcpy (preview_dst, preview_src, width);

609

memcpy (preview_dst + width * (preview_height - 1),

610

preview_src + width * (preview_height - 1),

611

width);

612

613

for (y = preview_height - 2, src_ptr = preview_src + width,

614

neg_ptr = preview_neg + width + img_bpp,

615

dst_ptr = preview_dst + width;

616

y > 0;

617

y --, src_ptr += width, neg_ptr += width, dst_ptr += width)

618

(*filter)(preview_width, src_ptr, dst_ptr, neg_ptr - width,

619

neg_ptr, neg_ptr + width);

620

621

gimp_preview_draw_buffer (preview, preview_dst, preview_width * img_bpp);

622

623

g_free (preview_src);

624

g_free (preview_neg);

625

g_free (preview_dst);

626

}

627

628

629

* 'gray_filter()' - Sharpen grayscale pixels.

630

631

632

static void

633

gray_filter (gint width, /* I - Width of line in pixels */

634

guchar *src, /* I - Source line */

635

guchar *dst, /* O - Destination line */

636

intneg *neg0, /* I - Top negative coefficient line */

637

intneg *neg1, /* I - Middle negative coefficient line */

638

intneg *neg2) /* I - Bottom negative coefficient line */

639

{

640

intpos pixel; /* New pixel value */

641

642

*dst++ = *src++;

643

width -= 2;

644

645

while (width > 0)

646

{

647

pixel = (pos_lut[*src++] - neg0[-1] - neg0[0] - neg0[1] -

648

neg1[-1] - neg1[1] -

649

neg2[-1] - neg2[0] - neg2[1]);

650

pixel = (pixel + 4) >> 3;

651

*dst++ = CLAMP0255 (pixel);

652

653

neg0 ++;

654

neg1 ++;

655

neg2 ++;

656

width --;

657

}

658

659

*dst++ = *src++;

660

}

661

662

663

* 'graya_filter()' - Sharpen grayscale+alpha pixels.

664

665

666

static void

667

graya_filter (gint width, /* I - Width of line in pixels */

668

guchar *src, /* I - Source line */

669

guchar *dst, /* O - Destination line */

670

intneg *neg0, /* I - Top negative coefficient line */

671

intneg *neg1, /* I - Middle negative coefficient line */

672

intneg *neg2) /* I - Bottom negative coefficient line */

673

{

674

intpos pixel; /* New pixel value */

675

676

*dst++ = *src++;

677

*dst++ = *src++;

678

width -= 2;

679

680

while (width > 0)

681

{

682

pixel = (pos_lut[*src++] - neg0[-2] - neg0[0] - neg0[2] -

683

neg1[-2] - neg1[2] -

684

neg2[-2] - neg2[0] - neg2[2]);

685

pixel = (pixel + 4) >> 3;

686

*dst++ = CLAMP0255 (pixel);

687

688

*dst++ = *src++;

689

neg0 += 2;

690

neg1 += 2;

691

neg2 += 2;

692

width --;

693

}

694

695

*dst++ = *src++;

696

*dst++ = *src++;

697

}

698

699

700

* 'rgb_filter()' - Sharpen RGB pixels.

701

702

703

static void

704

rgb_filter (gint width, /* I - Width of line in pixels */

705

guchar *src, /* I - Source line */

706

guchar *dst, /* O - Destination line */

707

intneg *neg0, /* I - Top negative coefficient line */

708

intneg *neg1, /* I - Middle negative coefficient line */

709

intneg *neg2) /* I - Bottom negative coefficient line */

710

{

711

intpos pixel; /* New pixel value */

712

713

*dst++ = *src++;

714

*dst++ = *src++;

715

*dst++ = *src++;

716

width -= 2;

717

718

while (width > 0)

719

{

720

pixel = (pos_lut[*src++] - neg0[-3] - neg0[0] - neg0[3] -

721

neg1[-3] - neg1[3] -

722

neg2[-3] - neg2[0] - neg2[3]);

723

pixel = (pixel + 4) >> 3;

724

*dst++ = CLAMP0255 (pixel);

725

726

pixel = (pos_lut[*src++] - neg0[-2] - neg0[1] - neg0[4] -

727

neg1[-2] - neg1[4] -

728

neg2[-2] - neg2[1] - neg2[4]);

729

pixel = (pixel + 4) >> 3;

730

*dst++ = CLAMP0255 (pixel);

731

732

pixel = (pos_lut[*src++] - neg0[-1] - neg0[2] - neg0[5] -

733

neg1[-1] - neg1[5] -

734

neg2[-1] - neg2[2] - neg2[5]);

735

pixel = (pixel + 4) >> 3;

736

*dst++ = CLAMP0255 (pixel);

737

738

neg0 += 3;

739

neg1 += 3;

740

neg2 += 3;

741

width --;

742

}

743

744

*dst++ = *src++;

745

*dst++ = *src++;

746

*dst++ = *src++;

747

}

748

749

750

* 'rgba_filter()' - Sharpen RGBA pixels.

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static void

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rgba_filter (gint width, /* I - Width of line in pixels */

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guchar *src, /* I - Source line */

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guchar *dst, /* O - Destination line */

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intneg *neg0, /* I - Top negative coefficient line */

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intneg *neg1, /* I - Middle negative coefficient line */

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intneg *neg2) /* I - Bottom negative coefficient line */

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{

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intpos pixel; /* New pixel value */

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*dst++ = *src++;

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*dst++ = *src++;

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*dst++ = *src++;

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*dst++ = *src++;

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width -= 2;

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while (width > 0)

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{

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pixel = (pos_lut[*src++] - neg0[-4] - neg0[0] - neg0[4] -

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neg1[-4] - neg1[4] -

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neg2[-4] - neg2[0] - neg2[4]);

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pixel = (pixel + 4) >> 3;

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*dst++ = CLAMP0255 (pixel);

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pixel = (pos_lut[*src++] - neg0[-3] - neg0[1] - neg0[5] -

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neg1[-3] - neg1[5] -

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neg2[-3] - neg2[1] - neg2[5]);

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pixel = (pixel + 4) >> 3;

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*dst++ = CLAMP0255 (pixel);

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pixel = (pos_lut[*src++] - neg0[-2] - neg0[2] - neg0[6] -

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neg1[-2] - neg1[6] -

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neg2[-2] - neg2[2] - neg2[6]);

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pixel = (pixel + 4) >> 3;

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*dst++ = CLAMP0255 (pixel);

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*dst++ = *src++;

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neg0 += 4;

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neg1 += 4;

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neg2 += 4;

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width --;

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}

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*dst++ = *src++;

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*dst++ = *src++;

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*dst++ = *src++;

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*dst++ = *src++;

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}

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