mirror of
https://github.com/webmproject/libwebp.git
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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// TIFF decode.
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#include "./tiffdec.h"
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#ifdef WEBP_HAVE_TIFF
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#include <tiffio.h>
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#include "webp/encode.h"
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int ReadTIFF(const char* const filename,
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WebPPicture* const pic, int keep_alpha) {
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TIFF* const tif = TIFFOpen(filename, "r");
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uint32 width, height;
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uint32* raster;
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int ok = 0;
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int dircount = 1;
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if (tif == NULL) {
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fprintf(stderr, "Error! Cannot open TIFF file '%s'\n", filename);
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return 0;
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}
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while (TIFFReadDirectory(tif)) ++dircount;
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if (dircount > 1) {
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fprintf(stderr, "Warning: multi-directory TIFF files are not supported.\n"
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"Only the first will be used, %d will be ignored.\n",
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dircount - 1);
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}
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TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);
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raster = (uint32*)_TIFFmalloc(width * height * sizeof(*raster));
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if (raster != NULL) {
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if (TIFFReadRGBAImageOriented(tif, width, height, raster,
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ORIENTATION_TOPLEFT, 1)) {
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const int stride = width * sizeof(*raster);
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pic->width = width;
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pic->height = height;
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// TIFF data is ABGR
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#ifdef __BIG_ENDIAN__
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TIFFSwabArrayOfLong(raster, width * height);
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#endif
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ok = keep_alpha
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? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
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: WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);
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}
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_TIFFfree(raster);
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} else {
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fprintf(stderr, "Error allocating TIFF RGBA memory!\n");
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}
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if (ok && keep_alpha == 2) {
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WebPCleanupTransparentArea(pic);
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}
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TIFFClose(tif);
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return ok;
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}
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#else // !WEBP_HAVE_TIFF
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int ReadTIFF(const char* const filename,
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struct WebPPicture* const pic, int keep_alpha) {
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(void)filename;
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(void)pic;
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(void)keep_alpha;
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fprintf(stderr, "TIFF support not compiled. Please install the libtiff "
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"development package before building.\n");
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return 0;
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}
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#endif // WEBP_HAVE_TIFF
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// -----------------------------------------------------------------------------
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