cpython.git - https://github.com/python/cpython.git

diff options

Diffstat (limited to 'Tools/build')

0 files changed, 0 insertions, 0 deletions

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qpnghandler_p.h"

#ifndef QT_NO_IMAGEFORMAT_PNG
#include <qcoreapplication.h>
#include <qiodevice.h>
#include <qimage.h>
#include <qlist.h>
#include <qtextcodec.h>
#include <qvariant.h>
#include <qvector.h>

#include <png.h>
#include <pngconf.h>

#ifdef Q_OS_WINCE
#define CALLBACK_CALL_TYPE        __cdecl
#else
#define CALLBACK_CALL_TYPE
#endif

QT_BEGIN_NAMESPACE

#if defined(Q_OS_WINCE) && defined(STANDARDSHELL_UI_MODEL)
#  define Q_INTERNAL_WIN_NO_THROW __declspec(nothrow)
#else
#  define Q_INTERNAL_WIN_NO_THROW
#endif

/*
  All PNG files load to the minimal QImage equivalent.

  All QImage formats output to reasonably efficient PNG equivalents.
  Never to grayscale.
*/

#if defined(Q_C_CALLBACKS)
extern "C" {
#endif

class QPNGImageWriter {
public:
    explicit QPNGImageWriter(QIODevice*);
    ~QPNGImageWriter();

    enum DisposalMethod { Unspecified, NoDisposal, RestoreBackground, RestoreImage };
    void setDisposalMethod(DisposalMethod);
    void setLooping(int loops=0); // 0 == infinity
    void setFrameDelay(int msecs);
    void setGamma(float);

    bool writeImage(const QImage& img, int x, int y);
    bool writeImage(const QImage& img, int quality, const QString &description, int x, int y);
    bool writeImage(const QImage& img)
        { return writeImage(img, 0, 0); }
    bool writeImage(const QImage& img, int quality, const QString &description)
        { return writeImage(img, quality, description, 0, 0); }

    QIODevice* device() { return dev; }

private:
    QIODevice* dev;
    int frames_written;
    DisposalMethod disposal;
    int looping;
    int ms_delay;
    float gamma;
};

static
void CALLBACK_CALL_TYPE iod_read_fn(png_structp png_ptr, png_bytep data, png_size_t length)
{
    QIODevice *in = (QIODevice *)png_get_io_ptr(png_ptr);

    while (length) {
        int nr = in->read((char*)data, length);
        if (nr <= 0) {
            png_error(png_ptr, "Read Error");
            return;
        }
        length -= nr;
    }
}


static
void CALLBACK_CALL_TYPE qpiw_write_fn(png_structp png_ptr, png_bytep data, png_size_t length)
{
    QPNGImageWriter* qpiw = (QPNGImageWriter*)png_get_io_ptr(png_ptr);
    QIODevice* out = qpiw->device();

    uint nr = out->write((char*)data, length);
    if (nr != length) {
        png_error(png_ptr, "Write Error");
        return;
    }
}


static
void CALLBACK_CALL_TYPE qpiw_flush_fn(png_structp /* png_ptr */)
{
}

#if defined(Q_C_CALLBACKS)
}
#endif

static
void setup_qt(QImage& image, png_structp png_ptr, png_infop info_ptr, float screen_gamma=0.0)
{
    if (screen_gamma != 0.0 && png_get_valid(png_ptr, info_ptr, PNG_INFO_gAMA)) {
        double file_gamma;
        png_get_gAMA(png_ptr, info_ptr, &file_gamma);
        png_set_gamma(png_ptr, screen_gamma, file_gamma);
    }

    png_uint_32 width;
    png_uint_32 height;
    int bit_depth;
    int color_type;
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);

    if (color_type == PNG_COLOR_TYPE_GRAY) {
        // Black & White or 8-bit grayscale
        if (bit_depth == 1 && info_ptr->channels == 1) {
            png_set_invert_mono(png_ptr);
            png_read_update_info(png_ptr, info_ptr);
            if (image.size() != QSize(width, height) || image.format() != QImage::Format_Mono) {
                image = QImage(width, height, QImage::Format_Mono);
                if (image.isNull())
                    return;
            }
            image.setColorCount(2);
            image.setColor(1, qRgb(0,0,0));
            image.setColor(0, qRgb(255,255,255));
        } else if (bit_depth == 16 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
            png_set_expand(png_ptr);
            png_set_strip_16(png_ptr);
            png_set_gray_to_rgb(png_ptr);
            if (image.size() != QSize(width, height) || image.format() != QImage::Format_ARGB32) {
                image = QImage(width, height, QImage::Format_ARGB32);
                if (image.isNull())
                    return;
            }
            if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
                png_set_swap_alpha(png_ptr);

            png_read_update_info(png_ptr, info_ptr);
        } else {
            if (bit_depth == 16)
                png_set_strip_16(png_ptr);
            else if (bit_depth < 8)
                png_set_packing(png_ptr);
            int ncols = bit_depth < 8 ? 1 << bit_depth : 256;
            png_read_update_info(png_ptr, info_ptr);
            if (image.size() != QSize(width, height) || image.format() != QImage::Format_Indexed8) {
                image = QImage(width, height, QImage::Format_Indexed8);
                if (image.isNull())
                    return;
            }
            image.setColorCount(ncols);
            for (int i=0; i<ncols; i++) {
                int c = i*255/(ncols-1);
                image.setColor(i, qRgba(c,c,c,0xff));
            }
            if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
#if PNG_LIBPNG_VER_MAJOR < 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR < 4)
                const int g = info_ptr->trans_values.gray;
#else
                const int g = info_ptr->trans_color.gray;
#endif
                if (g < ncols) {
                    image.setColor(g, 0);
                }
            }
        }
    } else if (color_type == PNG_COLOR_TYPE_PALETTE
               && png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)
               && info_ptr->num_palette <= 256)
    {
        // 1-bit and 8-bit color
        if (bit_depth != 1)
            png_set_packing(png_ptr);
        png_read_update_info(png_ptr, info_ptr);
        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
        QImage::Format format = bit_depth == 1 ? QImage::Format_Mono : QImage::Format_Indexed8;
        if (image.size() != QSize(width, height) || image.format() != format) {
            image = QImage(width, height, format);
            if (image.isNull())
                return;
        }
        image.setColorCount(info_ptr->num_palette);
        int i = 0;
        if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
            while (i < info_ptr->num_trans) {
                image.setColor(i, qRgba(
                    info_ptr->palette[i].red,
                    info_ptr->palette[i].green,
                    info_ptr->palette[i].blue,
#if PNG_LIBPNG_VER_MAJOR < 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR < 4)
                    info_ptr->trans[i]
#else
                    info_ptr->trans_alpha[i]
#endif
                   )
               );
                i++;
            }
        }
        while (i < info_ptr->num_palette) {
            image.setColor(i, qRgba(
                info_ptr->palette[i].red,
                info_ptr->palette[i].green,
                info_ptr->palette[i].blue,
                0xff
               )
           );
            i++;
        }
    } else {
        // 32-bit
        if (bit_depth == 16)
            png_set_strip_16(png_ptr);

        png_set_expand(png_ptr);

        if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
            png_set_gray_to_rgb(png_ptr);

        QImage::Format format = QImage::Format_ARGB32;
        // Only add filler if no alpha, or we can get 5 channel data.
        if (!(color_type & PNG_COLOR_MASK_ALPHA)
            && !png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
            png_set_filler(png_ptr, 0xff, QSysInfo::ByteOrder == QSysInfo::BigEndian ?
                           PNG_FILLER_BEFORE : PNG_FILLER_AFTER);
            // We want 4 bytes, but it isn't an alpha channel
            format = QImage::Format_RGB32;
        }
        if (image.size() != QSize(width, height) || image.format() != format) {
            image = QImage(width, height, format);
            if (image.isNull())
                return;
        }

        if (QSysInfo::ByteOrder == QSysInfo::BigEndian)
            png_set_swap_alpha(png_ptr);

        png_read_update_info(png_ptr, info_ptr);
    }

    // Qt==ARGB==Big(ARGB)==Little(BGRA)
    if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) {
        png_set_bgr(png_ptr);
    }
}


#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
static void CALLBACK_CALL_TYPE qt_png_warning(png_structp /*png_ptr*/, png_const_charp message)
{
    qWarning("libpng warning: %s", message);
}

#if defined(Q_C_CALLBACKS)
}
#endif

class QPngHandlerPrivate
{
public:
    enum State {
        Ready,
        ReadHeader,
        Error
    };

    QPngHandlerPrivate(QPngHandler *qq)
        : gamma(0.0), quality(2), png_ptr(0), info_ptr(0),
          end_info(0), row_pointers(0), state(Ready), q(qq)
    { }

    float gamma;
    int quality;
    QString description;

    png_struct *png_ptr;
    png_info *info_ptr;
    png_info *end_info;
    png_byte **row_pointers;

    bool readPngHeader();
    bool readPngImage(QImage *image);

    QImage::Format readImageFormat();

    State state;

    QPngHandler *q;
};

/*!
    \internal
*/
bool Q_INTERNAL_WIN_NO_THROW QPngHandlerPrivate::readPngHeader()
{
    state = Error;
    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
    if (!png_ptr)
        return false;

    png_set_error_fn(png_ptr, 0, 0, qt_png_warning);

    info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr) {
        png_destroy_read_struct(&png_ptr, 0, 0);
        png_ptr = 0;
        return false;
    }

    end_info = png_create_info_struct(png_ptr);
    if (!end_info) {
        png_destroy_read_struct(&png_ptr, &info_ptr, 0);
        png_ptr = 0;
        return false;
    }

    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
        png_ptr = 0;
        return false;
    }

    png_set_read_fn(png_ptr, q->device(), iod_read_fn);
    png_read_info(png_ptr, info_ptr);

#ifndef QT_NO_IMAGE_TEXT
    png_textp text_ptr;
    int num_text=0;
    png_get_text(png_ptr,info_ptr,&text_ptr,&num_text);

    while (num_text--) {
        QString key, value;
#if defined(PNG_iTXt_SUPPORTED)
        if (text_ptr->lang) {
            QTextCodec *codec = QTextCodec::codecForName(text_ptr->lang);
            if (codec) {
                key = codec->toUnicode(text_ptr->lang_key);
                value = codec->toUnicode(QByteArray(text_ptr->text, text_ptr->itxt_length));
            } else {
                key = QString::fromLatin1(text_ptr->key);
                value = QString::fromLatin1(QByteArray(text_ptr->text, int(text_ptr->text_length)));
            }
        } else
#endif
        {
            key = QString::fromLatin1(text_ptr->key);
            value = QString::fromLatin1(QByteArray(text_ptr->text, int(text_ptr->text_length)));
        }
        if (!description.isEmpty())
            description += QLatin1String("\n\n");
        description += key + QLatin1String(": ") + value.simplified();
        text_ptr++;
    }
#endif

    state = ReadHeader;
    return true;
}

/*!
    \internal
*/
bool Q_INTERNAL_WIN_NO_THROW QPngHandlerPrivate::readPngImage(QImage *outImage)
{
    if (state == Error)
        return false;

    if (state == Ready && !readPngHeader()) {
        state = Error;
        return false;
    }

    row_pointers = 0;
    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
        delete [] row_pointers;
        png_ptr = 0;
        state = Error;
        return false;
    }

    setup_qt(*outImage, png_ptr, info_ptr, gamma);

    if (outImage->isNull()) {
        png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
        delete [] row_pointers;
        png_ptr = 0;
        state = Error;
        return false;
    }

    png_uint_32 width;
    png_uint_32 height;
    int bit_depth;
    int color_type;
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
                 0, 0, 0);

    uchar *data = outImage->bits();
    int bpl = outImage->bytesPerLine();
    row_pointers = new png_bytep[height];

    for (uint y = 0; y < height; y++)
        row_pointers[y] = data + y * bpl;

    png_read_image(png_ptr, row_pointers);

#if 0 // libpng takes care of this.
    png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)
        if (outImage->depth()==32 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
            QRgb trans = 0xFF000000 | qRgb(
                (info_ptr->trans_values.red << 8 >> bit_depth)&0xff,
                (info_ptr->trans_values.green << 8 >> bit_depth)&0xff,
                (info_ptr->trans_values.blue << 8 >> bit_depth)&0xff);
            for (uint y=0; y<height; y++) {
                for (uint x=0; x<info_ptr->width; x++) {
                    if (((uint**)jt)[y][x] == trans) {
                        ((uint**)jt)[y][x] &= 0x00FFFFFF;
                    } else {
                    }
                }
            }
        }
#endif

    outImage->setDotsPerMeterX(png_get_x_pixels_per_meter(png_ptr,info_ptr));
    outImage->setDotsPerMeterY(png_get_y_pixels_per_meter(png_ptr,info_ptr));

#ifndef QT_NO_IMAGE_TEXT
    png_textp text_ptr;
    int num_text=0;
    png_get_text(png_ptr,info_ptr,&text_ptr,&num_text);
    while (num_text--) {
        outImage->setText(text_ptr->key,0,QString::fromAscii(text_ptr->text));
        text_ptr++;
    }

    foreach (const QString &pair, description.split(QLatin1String("\n\n"))) {
        int index = pair.indexOf(QLatin1Char(':'));
        if (index >= 0 && pair.indexOf(QLatin1Char(' ')) < index) {
            outImage->setText(QLatin1String("Description"), pair.simplified());
        } else {
            QString key = pair.left(index);
            outImage->setText(key, pair.mid(index + 2).simplified());
        }
    }
#endif

    png_read_end(png_ptr, end_info);
    png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
    delete [] row_pointers;
    png_ptr = 0;
    state = Ready;

    // sanity check palette entries
    if (color_type == PNG_COLOR_TYPE_PALETTE
        && outImage->format() == QImage::Format_Indexed8) {
        int color_table_size = outImage->colorCount();
        for (int y=0; y<(int)height; ++y) {
            uchar *p = outImage->scanLine(y);
            uchar *end = p + width;
            while (p < end) {
                if (*p >= color_table_size)
                    *p = 0;
                ++p;
            }
        }
    }

    return true;
}

QImage::Format QPngHandlerPrivate::readImageFormat()
{
        QImage::Format format = QImage::Format_Invalid;
        png_uint_32 width, height;
        int bit_depth, color_type;
        if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY) {
            // Black & White or 8-bit grayscale
            if (info_ptr->bit_depth == 1 && info_ptr->channels == 1) {
                format = QImage::Format_Mono;
            } else if (info_ptr->bit_depth == 16 && png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
                format = QImage::Format_ARGB32;
            } else {
                format = QImage::Format_Indexed8;
            }
        } else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE
                && png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE)
                   && info_ptr->num_palette <= 256)
        {
            // 1-bit and 8-bit color
            if (info_ptr->bit_depth != 1)
                png_set_packing(png_ptr);
            png_read_update_info(png_ptr, info_ptr);
            png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
            format = bit_depth == 1 ? QImage::Format_Mono : QImage::Format_Indexed8;
        } else {
            // 32-bit
            if (info_ptr->bit_depth == 16)
                png_set_strip_16(png_ptr);

            format = QImage::Format_ARGB32;
            // Only add filler if no alpha, or we can get 5 channel data.
            if (!(info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
                && !png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
                // We want 4 bytes, but it isn't an alpha channel
                format = QImage::Format_RGB32;
            }
        }

        return format;
}

QPNGImageWriter::QPNGImageWriter(QIODevice* iod) :
    dev(iod),
    frames_written(0),
    disposal(Unspecified),
    looping(-1),
    ms_delay(-1),
    gamma(0.0)
{
}

QPNGImageWriter::~QPNGImageWriter()
{
}

void QPNGImageWriter::setDisposalMethod(DisposalMethod dm)
{
    disposal = dm;
}

void QPNGImageWriter::setLooping(int loops)
{
    looping = loops;
}

void QPNGImageWriter::setFrameDelay(int msecs)
{
    ms_delay = msecs;
}

void QPNGImageWriter::setGamma(float g)
{
    gamma = g;
}


#ifndef QT_NO_IMAGE_TEXT
static void set_text(const QImage &image, png_structp png_ptr, png_infop info_ptr,
                     const QString &description)
{
    QMap<QString, QString> text;
    foreach (const QString &key, image.textKeys()) {
        if (!key.isEmpty())
            text.insert(key, image.text(key));
    }
    foreach (const QString &pair, description.split(QLatin1String("\n\n"))) {
        int index = pair.indexOf(QLatin1Char(':'));
        if (index >= 0 && pair.indexOf(QLatin1Char(' ')) < index) {
            QString s = pair.simplified();
            if (!s.isEmpty())
                text.insert(QLatin1String("Description"), s);
        } else {
            QString key = pair.left(index);
            if (!key.simplified().isEmpty())
                text.insert(key, pair.mid(index + 2).simplified());
        }
    }

    if (text.isEmpty())
        return;

    png_textp text_ptr = new png_text[text.size()];

    QMap<QString, QString>::ConstIterator it = text.constBegin();
    int i = 0;
    while (it != text.constEnd()) {
        QString t = it.value();
        if (t.length() < 40)
            text_ptr[i].compression = PNG_TEXT_COMPRESSION_NONE;
        else
            text_ptr[i].compression = PNG_TEXT_COMPRESSION_zTXt;
        text_ptr[i].key = qstrdup(it.key().left(79).toLatin1().constData());

#ifndef PNG_iTXt_SUPPORTED
        QByteArray value = it.value().toLatin1();
        text_ptr[i].text = qstrdup(value.constData());
        text_ptr[i].text_length = value.size();
#else
        QByteArray value = it.value().toUtf8();
        text_ptr[i].text = qstrdup(value.constData());
        text_ptr[i].text_length = 0;
        text_ptr[i].itxt_length = value.size();
        text_ptr[i].lang = "UTF-8";
        text_ptr[i].lang_key = qstrdup(it.key().toUtf8().constData());
#endif
        ++i;
        ++it;
    }

    png_set_text(png_ptr, info_ptr, text_ptr, i);
    for (i = 0; i < text.size(); ++i) {
        delete [] text_ptr[i].key;
        delete [] text_ptr[i].text;
#ifdef PNG_iTXt_SUPPORTED
        delete [] text_ptr[i].lang_key;
#endif
    }
    delete [] text_ptr;
}
#endif

bool QPNGImageWriter::writeImage(const QImage& image, int off_x, int off_y)
{
    return writeImage(image, -1, QString(), off_x, off_y);
}

bool Q_INTERNAL_WIN_NO_THROW QPNGImageWriter::writeImage(const QImage& image_in, int quality_in, const QString &description,
                                 int off_x_in, int off_y_in)
{
#ifdef QT_NO_IMAGE_TEXT
    Q_UNUSED(description);
#endif

    QImage image;
    switch (image_in.format()) {
    case QImage::Format_ARGB32_Premultiplied:
    case QImage::Format_ARGB4444_Premultiplied:
    case QImage::Format_ARGB8555_Premultiplied:
    case QImage::Format_ARGB8565_Premultiplied:
    case QImage::Format_ARGB6666_Premultiplied:
        image = image_in.convertToFormat(QImage::Format_ARGB32);
        break;
    case QImage::Format_RGB16:
    case QImage::Format_RGB444:
    case QImage::Format_RGB555:
    case QImage::Format_RGB666:
    case QImage::Format_RGB888:
        image = image_in.convertToFormat(QImage::Format_RGB32);
        break;
    default:
        image = image_in;
        break;
    }

    QPoint offset = image.offset();
    int off_x = off_x_in + offset.x();
    int off_y = off_y_in + offset.y();

    png_structp png_ptr;
    png_infop info_ptr;
    png_bytep* row_pointers;

    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,0,0,0);
    if (!png_ptr) {
        return false;
    }

    png_set_error_fn(png_ptr, 0, 0, qt_png_warning);

    info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr) {
        png_destroy_write_struct(&png_ptr, 0);
        return false;
    }

    if (setjmp(png_jmpbuf(png_ptr))) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
        return false;
    }

    int quality = quality_in;
    if (quality >= 0) {
        if (quality > 9) {
            qWarning("PNG: Quality %d out of range", quality);
            quality = 9;
        }
        png_set_compression_level(png_ptr, quality);
    }

    if (gamma != 0.0) {
        png_set_gAMA(png_ptr, info_ptr, 1.0/gamma);
    }

    png_set_write_fn(png_ptr, (void*)this, qpiw_write_fn, qpiw_flush_fn);

    info_ptr->channels =
        (image.depth() == 32)
        ? (image.format() == QImage::Format_RGB32 ? 3 : 4)
        : 1;

    png_set_IHDR(png_ptr, info_ptr, image.width(), image.height(),
        image.depth() == 1 ? 1 : 8 /* per channel */,
        image.depth() == 32
            ? image.format() == QImage::Format_RGB32
                ? PNG_COLOR_TYPE_RGB
                : PNG_COLOR_TYPE_RGB_ALPHA
            : PNG_COLOR_TYPE_PALETTE, 0, 0, 0);


    //png_set_sBIT(png_ptr, info_ptr, 8);
    info_ptr->sig_bit.red = 8;
    info_ptr->sig_bit.green = 8;
    info_ptr->sig_bit.blue = 8;

    if (image.format() == QImage::Format_MonoLSB)
       png_set_packswap(png_ptr);

    png_colorp palette = 0;
    png_bytep copy_trans = 0;
    if (image.colorCount()) {
        // Paletted
        int num_palette = image.colorCount();
        palette = new png_color[num_palette];
        png_set_PLTE(png_ptr, info_ptr, palette, num_palette);
        int* trans = new int[num_palette];
        int num_trans = 0;
        for (int i=0; i<num_palette; i++) {
            QRgb rgb=image.color(i);
            info_ptr->palette[i].red = qRed(rgb);
            info_ptr->palette[i].green = qGreen(rgb);
            info_ptr->palette[i].blue = qBlue(rgb);
            trans[i] = rgb >> 24;
            if (trans[i] < 255) {
                num_trans = i+1;
            }
        }
        if (num_trans) {
            copy_trans = new png_byte[num_trans];
            for (int i=0; i<num_trans; i++)
                copy_trans[i] = trans[i];
            png_set_tRNS(png_ptr, info_ptr, copy_trans, num_trans, 0);
        }
        delete [] trans;
    }

    if (image.format() != QImage::Format_RGB32) {
        info_ptr->sig_bit.alpha = 8;
    }

    // Swap ARGB to RGBA (normal PNG format) before saving on
    // BigEndian machines
    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
        png_set_swap_alpha(png_ptr);
    }

    // Qt==ARGB==Big(ARGB)==Little(BGRA)
    if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) {
        png_set_bgr(png_ptr);
    }

    if (off_x || off_y) {
        png_set_oFFs(png_ptr, info_ptr, off_x, off_y, PNG_OFFSET_PIXEL);
    }

    if (frames_written > 0)
        png_set_sig_bytes(png_ptr, 8);

    if (image.dotsPerMeterX() > 0 || image.dotsPerMeterY() > 0) {
        png_set_pHYs(png_ptr, info_ptr,
                image.dotsPerMeterX(), image.dotsPerMeterY(),
                PNG_RESOLUTION_METER);
    }

#ifndef QT_NO_IMAGE_TEXT
    set_text(image, png_ptr, info_ptr, description);
#endif
    png_write_info(png_ptr, info_ptr);

    if (image.depth() != 1)
        png_set_packing(png_ptr);

    if (image.format() == QImage::Format_RGB32)
        png_set_filler(png_ptr, 0,
            QSysInfo::ByteOrder == QSysInfo::BigEndian ?
                PNG_FILLER_BEFORE : PNG_FILLER_AFTER);

    if (looping >= 0 && frames_written == 0) {
        uchar data[13] = "NETSCAPE2.0";
        //                0123456789aBC
        data[0xB] = looping%0x100;
        data[0xC] = looping/0x100;
        png_write_chunk(png_ptr, (png_byte*)"gIFx", data, 13);
    }
    if (ms_delay >= 0 || disposal!=Unspecified) {
        uchar data[4];
        data[0] = disposal;
        data[1] = 0;
        data[2] = (ms_delay/10)/0x100; // hundredths
        data[3] = (ms_delay/10)%0x100;
        png_write_chunk(png_ptr, (png_byte*)"gIFg", data, 4);
    }

    png_uint_32 width;
    png_uint_32 height;
    int bit_depth;
    int color_type;
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
        0, 0, 0);

    const uchar *data = image.bits();
    int bpl = image.bytesPerLine();
    row_pointers = new png_bytep[height];
    uint y;
    for (y=0; y<height; y++) {
        row_pointers[y] = (png_bytep)(data + y * bpl);
    }
    png_write_image(png_ptr, row_pointers);
    delete [] row_pointers;

    png_write_end(png_ptr, info_ptr);
    frames_written++;

    if (palette)
        delete [] palette;
    if (copy_trans)
        delete [] copy_trans;

    png_destroy_write_struct(&png_ptr, &info_ptr);

    return true;
}

static bool write_png_image(const QImage &image, QIODevice *device,
                            int quality, float gamma, const QString &description)
{
    QPNGImageWriter writer(device);
    if (quality >= 0) {
        quality = qMin(quality, 100);
        quality = (100-quality) * 9 / 91; // map [0,100] -> [9,0]
    }
    writer.setGamma(gamma);
    return writer.writeImage(image, quality, description);
}

QPngHandler::QPngHandler()
    : d(new QPngHandlerPrivate(this))
{
}

QPngHandler::~QPngHandler()
{
    if (d->png_ptr)
        png_destroy_read_struct(&d->png_ptr, &d->info_ptr, &d->end_info);
    delete d;
}

bool QPngHandler::canRead() const
{
    if (d->state == QPngHandlerPrivate::Ready) {
        if (!canRead(device()))
            return false;
        setFormat("png");
        return true;
    }
    return d->state != QPngHandlerPrivate::Error;
}

bool QPngHandler::canRead(QIODevice *device)
{
    if (!device) {
        qWarning("QPngHandler::canRead() called with no device");
        return false;
    }

    return device->peek(8) == "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
}

bool QPngHandler::read(QImage *image)
{
    if (!canRead())
        return false;
    return d->readPngImage(image);
}

bool QPngHandler::write(const QImage &image)
{
    return write_png_image(image, device(), d->quality, d->gamma, d->description);
}

bool QPngHandler::supportsOption(ImageOption option) const
{
    return option == Gamma
        || option == Description
        || option == ImageFormat
        || option == Quality
        || option == Size;
}

QVariant QPngHandler::option(ImageOption option) const
{
    if (d->state == QPngHandlerPrivate::Error)
        return QVariant();
    if (d->state == QPngHandlerPrivate::Ready && !d->readPngHeader())
        return QVariant();

    if (option == Gamma)
        return d->gamma;
    else if (option == Quality)
        return d->quality;
    else if (option == Description)
        return d->description;
    else if (option == Size)
        return QSize(d->info_ptr->width, d->info_ptr->height);
    else if (option == ImageFormat)
        return d->readImageFormat();
    return 0;
}

void QPngHandler::setOption(ImageOption option, const QVariant &value)
{
    if (option == Gamma)
        d->gamma = value.toFloat();
    else if (option == Quality)
        d->quality = value.toInt();
    else if (option == Description)
        d->description = value.toString();
}

QByteArray QPngHandler::name() const
{
    return "png";
}

QT_END_NAMESPACE

#endif // QT_NO_IMAGEFORMAT_PNG


context:
space:
mode: