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add uncompressed TIFF output support
new option: 'dwebp -tiff ...' This is a very simple uncompressed-tiff writing method. Change-Id: Ie2182c8498bce570de3cde363abe1099e18596cb
This commit is contained in:
Pascal Massimino
parent
8eae188a62
commit
a3aede9739
1
NEWS
1
NEWS
@ -1,6 +1,7 @@
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- Next version:
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* Add incremental decoding support for images containing ALPH and ICCP chunks.
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* New function: WebPMuxGetCanvasSize
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* BMP and TIFF format output added to 'dwebp'
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- 3/20/13: version 0.3.0
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This is a binary compatible release.
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1
README
1
README
@ -248,6 +248,7 @@ Use following options to convert into alternate image formats:
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-pam ......... save the raw RGBA samples as a color PAM
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-ppm ......... save the raw RGB samples as a color PPM
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-bmp ......... save as uncompressed BMP format
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-tiff ........ save as uncompressed TIFF format
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-pgm ......... save the raw YUV samples as a grayscale PGM
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file with IMC4 layout
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-yuv ......... save the raw YUV samples in flat layout
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@ -61,6 +61,7 @@ typedef enum {
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PPM,
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PGM,
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BMP,
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TIFF,
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YUV,
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ALPHA_PLANE_ONLY // this is for experimenting only
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} OutputFileFormat;
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@ -290,6 +291,80 @@ static int WriteBMP(FILE* fout, const WebPDecBuffer* const buffer) {
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}
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#undef BMP_HEADER_SIZE
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#define NUM_IFD_ENTRIES 15
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#define EXTRA_DATA_SIZE 16
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// 10b for signature/header + n * 12b entries + 4b for IFD terminator:
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#define EXTRA_DATA_OFFSET (10 + 12 * NUM_IFD_ENTRIES + 4)
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#define TIFF_HEADER_SIZE (EXTRA_DATA_OFFSET + EXTRA_DATA_SIZE)
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static int WriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) {
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const int has_alpha = (buffer->colorspace != MODE_RGB);
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const uint32_t width = buffer->width;
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const uint32_t height = buffer->height;
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const uint8_t* const rgba = buffer->u.RGBA.rgba;
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const int stride = buffer->u.RGBA.stride;
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const uint8_t bytes_per_px = has_alpha ? 4 : 3;
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// For non-alpha case, we omit tag 0x152 (ExtraSamples).
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const uint8_t num_ifd_entries = has_alpha ? NUM_IFD_ENTRIES
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: NUM_IFD_ENTRIES - 1;
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uint8_t tiff_header[TIFF_HEADER_SIZE] = {
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0x49, 0x49, 0x2a, 0x00, // little endian signature
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8, 0, 0, 0, // offset to the unique IFD that follows
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// IFD (offset = 8). Entries must be written in increasing tag order.
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num_ifd_entries, 0, // Number of entries in the IFD (12 bytes each).
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0x00, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 10: Width (TBD)
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0x01, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 22: Height (TBD)
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0x02, 0x01, 3, 0, bytes_per_px, 0, 0, 0, // 34: BitsPerSample: 8888
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EXTRA_DATA_OFFSET + 0, 0, 0, 0,
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0x03, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 46: Compression: none
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0x06, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 58: Photometric: RGB
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0x11, 0x01, 4, 0, 1, 0, 0, 0, // 70: Strips offset:
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TIFF_HEADER_SIZE, 0, 0, 0, // data follows header
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0x12, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 82: Orientation: topleft
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0x15, 0x01, 3, 0, 1, 0, 0, 0, // 94: SamplesPerPixels
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bytes_per_px, 0, 0, 0,
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0x16, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 106: Rows per strip (TBD)
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0x17, 0x01, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 118: StripByteCount (TBD)
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0x1a, 0x01, 5, 0, 1, 0, 0, 0, // 130: X-resolution
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EXTRA_DATA_OFFSET + 8, 0, 0, 0,
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0x1b, 0x01, 5, 0, 1, 0, 0, 0, // 142: Y-resolution
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EXTRA_DATA_OFFSET + 8, 0, 0, 0,
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0x1c, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 154: PlanarConfiguration
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0x28, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, // 166: ResolutionUnit (inch)
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0x52, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0, // 178: ExtraSamples: rgbA
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0, 0, 0, 0, // 190: IFD terminator
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// EXTRA_DATA_OFFSET:
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8, 0, 8, 0, 8, 0, 8, 0, // BitsPerSample
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72, 0, 0, 0, 1, 0, 0, 0 // 72 pixels/inch, for X/Y-resolution
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};
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uint32_t y;
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// Fill placeholders in IFD:
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PutLE32(tiff_header + 10 + 8, width);
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PutLE32(tiff_header + 22 + 8, height);
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PutLE32(tiff_header + 106 + 8, height);
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PutLE32(tiff_header + 118 + 8, width * bytes_per_px * height);
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if (!has_alpha) PutLE32(tiff_header + 178, 0); // IFD terminator
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// write header
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if (fwrite(tiff_header, sizeof(tiff_header), 1, fout) != 1) {
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return 0;
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}
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// write pixel values
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for (y = 0; y < height; ++y) {
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if (fwrite(rgba + y * stride, bytes_per_px, width, fout) != width) {
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return 0;
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}
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}
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return 1;
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}
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#undef TIFF_HEADER_SIZE
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#undef EXTRA_DATA_OFFSET
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#undef EXTRA_DATA_SIZE
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#undef NUM_IFD_ENTRIES
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static int WriteAlphaPlane(FILE* fout, const WebPDecBuffer* const buffer) {
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const uint32_t width = buffer->width;
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const uint32_t height = buffer->height;
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@ -387,6 +462,8 @@ static void SaveOutput(const WebPDecBuffer* const buffer,
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ok &= WritePPM(fout, buffer, 0);
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} else if (format == BMP) {
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ok &= WriteBMP(fout, buffer);
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} else if (format == TIFF) {
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ok &= WriteTIFF(fout, buffer);
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} else if (format == PGM || format == YUV) {
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ok &= WritePGMOrYUV(fout, buffer, format);
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} else if (format == ALPHA_PLANE_ONLY) {
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@ -413,6 +490,7 @@ static void Help(void) {
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" -pam ......... save the raw RGBA samples as a color PAM\n"
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" -ppm ......... save the raw RGB samples as a color PPM\n"
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" -bmp ......... save as uncompressed BMP format\n"
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" -tiff ........ save as uncompressed TIFF format\n"
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" -pgm ......... save the raw YUV samples as a grayscale PGM\n"
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" file with IMC4 layout\n"
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" -yuv ......... save the raw YUV samples in flat layout\n"
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@ -471,6 +549,8 @@ int main(int argc, const char *argv[]) {
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format = PPM;
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} else if (!strcmp(argv[c], "-bmp")) {
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format = BMP;
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} else if (!strcmp(argv[c], "-tiff")) {
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format = TIFF;
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} else if (!strcmp(argv[c], "-version")) {
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const int version = WebPGetDecoderVersion();
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printf("%d.%d.%d\n",
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@ -554,6 +634,10 @@ int main(int argc, const char *argv[]) {
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case BMP:
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output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
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break;
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case TIFF: // note: force pre-multiplied alpha
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output_buffer->colorspace =
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bitstream->has_alpha ? MODE_rgbA : MODE_RGB;
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break;
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case PGM:
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case YUV:
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output_buffer->colorspace = bitstream->has_alpha ? MODE_YUVA : MODE_YUV;
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@ -1,5 +1,5 @@
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.\" Hey, EMACS: -*- nroff -*-
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.TH DWEBP 1 "April 09, 2013"
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.TH DWEBP 1 "May 10, 2013"
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.SH NAME
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dwebp \- decompress a WebP file to an image file
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.SH SYNOPSIS
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@ -27,6 +27,9 @@ Specify the name of the output file (as PNG format by default).
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.B \-bmp
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Change the output format to uncompressed BMP.
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.TP
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.B \-tiff
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Change the output format to uncompressed TIFF.
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.TP
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.B \-pam
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Change the output format to PAM (retains alpha).
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.TP
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