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/*
* This file is part of Netpbm (http://netpbm.sourceforge.org).
* Copyright (c) 2022 cancername.
*
* 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, version 3.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <assert.h>
#include "pam.h"
#include "nstring.h"
#include "qoi.h"
#define QOI_MAXVAL 0xFF
/* tuple row to qoi row */
typedef void Trqr(const tuplen * const tuplerown,
unsigned int const width,
unsigned char * const qoiRow);
static Trqr trqrRgb;
static void
trqrRgb(const tuplen * const tuplerown,
unsigned int const cols,
unsigned char * const qoiRow) {
size_t qoiRowCursor;
unsigned int col;
for (col = 0, qoiRowCursor = 0; col < cols; ++col) {
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_RED_PLANE] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_GRN_PLANE] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_BLU_PLANE] * QOI_MAXVAL;
}
}
static Trqr trqrRgba;
static void
trqrRgba(const tuplen * const tuplerown,
unsigned int const cols,
unsigned char * const qoiRow) {
size_t qoiRowCursor;
unsigned int col;
for (col = 0, qoiRowCursor = 0; col < cols; ++col) {
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_RED_PLANE] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_GRN_PLANE] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_BLU_PLANE] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = tuplerown[col][PAM_TRN_PLANE] * QOI_MAXVAL;
}
}
static Trqr trqrGray;
static void
trqrGray(const tuplen * const tuplerown,
unsigned int const cols,
unsigned char * const qoiRow) {
size_t qoiRowCursor;
unsigned int col;
for (col = 0, qoiRowCursor = 0; col < cols; ++col) {
unsigned char const qoiSample = tuplerown[col][0] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = qoiSample;
qoiRow[qoiRowCursor++] = qoiSample;
qoiRow[qoiRowCursor++] = qoiSample;
}
}
static Trqr trqrGrayAlpha;
static void
trqrGrayAlpha(const tuplen * const tuplerown,
unsigned int const cols,
unsigned char * const qoiRow) {
size_t qoiRowCursor;
unsigned int col;
for (col = 0, qoiRowCursor = 0; col < cols; ++col) {
unsigned char const qoiSample = tuplerown[col][0] * QOI_MAXVAL;
qoiRow[qoiRowCursor++] = qoiSample;
qoiRow[qoiRowCursor++] = qoiSample;
qoiRow[qoiRowCursor++] = qoiSample;
qoiRow[qoiRowCursor++] =
tuplerown[col][PAM_GRAY_TRN_PLANE] * QOI_MAXVAL;
}
}
static Trqr *
trqrForTupleType(const char * const tupleType) {
if (streq(tupleType, PAM_PPM_TUPLETYPE))
return &trqrRgb;
else if(streq(tupleType, PAM_PPM_ALPHA_TUPLETYPE))
return &trqrRgba;
else if(streq(tupleType, PAM_PBM_TUPLETYPE) ||
streq(tupleType, PAM_PGM_TUPLETYPE))
return &trqrGray;
else if(streq(tupleType, PAM_PBM_ALPHA_TUPLETYPE) ||
streq(tupleType, PAM_PGM_ALPHA_TUPLETYPE))
return &trqrGrayAlpha;
else {
pm_error("Don't know how to convert tuple type '%s'.", tupleType);
return NULL; /* Suppress compiler warning */
}
}
int
main(int argc, char **argv) {
struct pam inpam;
Trqr * trqr;
qoi_Desc qoiDesc;
tuplen * tuplerown;
unsigned char * qoiRaster;
unsigned char * qoiImage;
size_t qoiSz;
unsigned int row;
pm_proginit(&argc, (const char **)argv);
pnm_readpaminit(stdin, &inpam, PAM_STRUCT_SIZE(tuple_type));
tuplerown = pnm_allocpamrown(&inpam);
qoiDesc.colorspace = QOI_SRGB;
qoiDesc.width = inpam.width;
qoiDesc.height = inpam.height;
qoiDesc.channelCt = inpam.depth <= 3 ? 3 : 4;
qoiRaster = malloc(qoiDesc.width * qoiDesc.height * qoiDesc.channelCt);
if (!qoiRaster)
pm_error("Unable to get memory for QOI raster %u x %u x %u",
qoiDesc.width, qoiDesc.height, qoiDesc.channelCt);
trqr = trqrForTupleType(inpam.tuple_type);
/* Read and convert rows. */
for (row = 0; row < inpam.height; ++row) {
pnm_readpamrown(&inpam, tuplerown);
trqr(tuplerown,
inpam.width,
&qoiRaster[row * inpam.width * qoiDesc.channelCt]);
}
qoiImage = qoi_encode(qoiRaster, &qoiDesc, &qoiSz);
pm_writefile(stdout, qoiImage, qoiSz);
free(qoiImage);
free(qoiRaster);
pnm_freepamrown(tuplerown);
return 0;
}
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