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%%	options 
copyright owner	=	Dirk Krause
copyright year	=	2017-xxxx
SPDX-License-Identifier:	BSD-3-Clause


%%	module
#include "dk4conf.h"


#if	DK4_HAVE_PNG_H


#ifndef	PNG_H_INCLUDED
#include <png.h>
#define	PNG_H_INCLUDED 1
#endif

#if	DK4_HAVE_SETJMP_H
#ifndef	SETJMP_H_INCLUDED
#include <setjmp.h>
#define	SETJMP_H_INCLUDED 1
#endif
#endif

#ifndef	DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef	DK4MEM_H_INCLUDED
#include "dk4mem.h"
#endif

#ifndef	DK4MAASZ_H_INCLUDED
#include "dk4maasz.h"
#endif

#ifndef	DK4BIFTY_H_INCLUDED
#include "dk4bifty.h"
#endif

#ifndef	DK4BIF_H_INCLUDED
#include "dk4bif.h"
#endif

#ifndef	BIF_H_INCLUDED
#include "bif.h"
#endif

#ifndef	DK4UNUSED_H_INCLUDED
#include "dk4unused.h"
#endif

#if DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif


$!trace-include



/** User defined error handler for libpng functions.
    @param  pfptr   	Pointer to per-frame structure containing a jump buffer.
    @param  error_msg	Libpng error message, ignored here.
*/
static
void
dk4bifpng_i_error_fn(
	dk4_bif_png_per_frame_t *pfptr,
	png_const_charp			 DK4_ARG_UNUSED(error_msg)
)
{
	DK4_UNUSED_ARG(error_msg)
    if (NULL != pfptr) {
        if (2 > pfptr->had_error) {
            pfptr->had_error = 2;
        }
        longjmp(pfptr->jump_buf, 1);
    }
}



/** User defined error handler for libpng functions.
    @param  pfptr		Pointer to per-frame structure containing a jump buffer.
    @param  error_msg	Libpng error message, ignored here.
*/
static
void
dk4bifpng_i_warning_fn(
	dk4_bif_png_per_frame_t *pfptr,
	png_const_charp			 DK4_ARG_UNUSED(error_msg)
)
{
	DK4_UNUSED_ARG(error_msg)
    if (NULL != pfptr) {
        if (1 > pfptr->had_error) {
            pfptr->had_error = 1;
        }
    }
}



/**	Allocate new per-frame data structure.
	@param	erp	Error report, may be NULL.
	@return	Valid pointer on success, NULL on error.
*/

static
dk4_bif_png_per_frame_t	*
dk4bifpng_tsdata_new(dk4_er_t *erp)
{
	dk4_bif_png_per_frame_t	*back	= NULL;
	$? "+ dk4_bif_png_per_frame_t"
	back = dk4mem_new(dk4_bif_png_per_frame_t,1,erp);
	if (NULL != back) {
		back->rows = NULL;
		back->dblxdpi = -1.0;
		back->dblydpi = -1.0;
		back->rowbytes = 0UL;
		back->w = 0UL;
		back->h = 0UL;
		back->xdpi = 0UL;
		back->ydpi = 0UL;
		back->ct = 0;
		back->im = 0;
		back->cm = 0;
		back->fm = 0;
		back->ch = 0;
		back->ip = 0;
		back->bd = 0;
		back->had_error = 0;
	}
	$? "- dk4_bif_png_per_frame_t %d", TR_IPTR(back)
	return back;
}



void
dk4bifpng_nc_release_per_frame_data(
	void			*tsdata
)
{
	png_bytep				*rp;		/* Current row to release */
	dk4_bif_png_per_frame_t	*ppngfr;	/* Per-frame data */
	png_uint_32				 i;			/* Current row index */
	$? "+ dk4bifpng_nc_release_per_frame_data"
#if	DK4_USE_ASSERT
	assert(NULL != tsdata);
#endif
	ppngfr = (dk4_bif_png_per_frame_t *)tsdata;
	if (NULL != ppngfr->rows) {
		rp = ppngfr->rows;
		for (i = 0UL; i < ppngfr->h; i++) {
			dk4mem_release(*rp);
			rp++;
		}
		dk4mem_release(ppngfr->rows);
	}
	dk4mem_release(ppngfr);
	$? "- dk4bifpng_nc_release_per_frame_data"
}



void
dk4bifpng_nc_release_per_file_data(
	void	*tsdata
)
{
	$? "+ dk4bifpng_nc_release_per_file_data"
#if	DK4_USE_ASSERT
	assert(NULL != tsdata);
#endif
	dk4mem_release(tsdata);
	$? "- dk4bifpng_nc_release_per_file_data"
}



dk4_bif_t *
dk4bifpng_nc_open_file(
	FILE						*fipo,
	dkChar	const				*fn,
	int							 honly,
	dk4_cs_conv_ctx_t	const	*pcsctx,
	dk4_bif_png_clobbered_t		*pngcp,
	dk4_er_t					*erp
)
{
	unsigned char			 pngsig[8];			/* Buffer for PNG signature */
	dk4_px_resample_t		 pxres;				/* Pixel resampler */
	png_color_16p			 bgp		= NULL;	/* Background data */
	png_structp				 ppngread	= NULL;	/* PNG reader structure */
	png_infop				 ppnginfo	= NULL;	/* PNG info structure */
	size_t					 i;
	$? "+ dk4bifpng_nc_open_file"
#if	DK4_USE_ASSERT
	assert(NULL != fipo);
#endif
	/*
		Create bif and frame for one-frame image
	*/
	pngcp->back = dk4biftool_nc_new_for_one_frame(
		fn, DK4_BIF_TYPE_PNG, honly, pcsctx, erp
	);
	if (NULL == pngcp->back) {
		goto finished;
	}
	/*	Allocate per-frame data structure
	*/
	(pngcp->back->cf)->tsdata = dk4bifpng_tsdata_new(erp);
	if (NULL == (pngcp->back->cf)->tsdata) {
		goto finished;
	}
	pngcp->pfrpng = (dk4_bif_png_per_frame_t *)((pngcp->back->cf)->tsdata);
	/*	
		Check PNG signature
	*/
	if (8 != fread(pngsig, 1, 8, fipo)) {
		goto finished;
	}
	if (!png_check_sig(pngsig, 8)) {
		goto finished;
	}
	/*	Create PNG reader structure
	*/
	if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
		ppngread = png_create_read_struct(
			PNG_LIBPNG_VER_STRING,
			(png_voidp)pngcp->pfrpng,
			(png_error_ptr)dk4bifpng_i_error_fn,
			(png_error_ptr)dk4bifpng_i_warning_fn
		);
		if (NULL == ppngread) {
			dk4error_set_elsize_nelem(
				erp, DK4_E_MEMORY_ALLOCATION_FAILED, sizeof(png_structp), 1
			);
			goto finished;
		}
	}
	else {
		pngcp->pfrpng->had_error = 2;
		goto finished;
	}
	/*	Create PNG info structure
	*/
	if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
		ppnginfo = png_create_info_struct(ppngread);
		if (NULL == ppnginfo) {
			dk4error_set_elsize_nelem(
				erp, DK4_E_MEMORY_ALLOCATION_FAILED, sizeof(png_infop), 1
			);
			goto finished;
		}
	}
	else {
		pngcp->pfrpng->had_error = 2;
		goto finished;
	}
	/*	First reading pass (header information)
	*/
	if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
		/*
			Initialize PNG IO with file
		*/
		png_init_io(ppngread, fipo);
		/*
			Set number of bytes used in signature check
		*/
		png_set_sig_bytes(ppngread, 8);
		/*
			Read information from file header
		*/
		png_read_info(ppngread, ppnginfo);
		png_get_IHDR(
			ppngread, ppnginfo,
			&(pngcp->pfrpng->w), &(pngcp->pfrpng->h), &(pngcp->pfrpng->bd), &(pngcp->pfrpng->ct),
			&(pngcp->pfrpng->im), &(pngcp->pfrpng->cm), &(pngcp->pfrpng->fm)
		);
		(pngcp->back->cf)->bg[0] = dk4pxbit_get_max(pngcp->pfrpng->bd);
		(pngcp->back->cf)->bg[1] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bg[2] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[0] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[1] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[2] = (pngcp->back->cf)->bg[0];
		pngcp->pfrpng->ch = png_get_channels(ppngread, ppnginfo);
		/*
			Read resolution
		*/
		if (png_get_valid(ppngread, ppnginfo, PNG_INFO_pHYs)) {
#if	DK4_HAVE_PNG_GET_PIXELS_PER_INCH
			pngcp->pfrpng->xdpi = pngcp->pfrpng->ydpi = png_get_pixels_per_inch(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->xdpi = png_get_x_pixels_per_inch(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->ydpi = png_get_y_pixels_per_inch(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->dblxdpi = (double)(pngcp->pfrpng->xdpi);
			pngcp->pfrpng->dblydpi = (double)(pngcp->pfrpng->ydpi);
#else
			pngcp->pfrpng->xdpi = pngcp->pfrpng->ydpi = png_get_pixels_per_meter(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->xdpi = png_get_x_pixels_per_meter(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->ydpi = png_get_y_pixels_per_meter(
				ppngread, ppnginfo
			);
			pngcp->pfrpng->dblxdpi = 0.0254 * (double)(pngcp->pfrpng->xdpi);
			pngcp->pfrpng->dblydpi = 0.0254 * (double)(pngcp->pfrpng->ydpi);
			pngcp->pfrpng->xdpi = (png_uint_32)(pngcp->pfrpng->dblxdpi);
			pngcp->pfrpng->ydpi = (png_uint_32)(pngcp->pfrpng->dblydpi);
#endif
		}
		/*	Require palette to RGB conversion if necessary
		*/
		if (PNG_COLOR_TYPE_PALETTE == pngcp->pfrpng->ct) {
			png_set_palette_to_rgb(ppngread);
		}
		/*	Require mask to alpha conversion if necessary
		*/
		if(png_get_valid(ppngread, ppnginfo, PNG_INFO_tRNS)) {
			png_set_tRNS_to_alpha(ppngread);
		}
		/*	Set up automatic interlace handling
		*/
		if (PNG_INTERLACE_ADAM7 == pngcp->pfrpng->im) {
			pngcp->pfrpng->ip = png_set_interlace_handling(ppngread);
		}
		/*	Update information
		*/
		png_read_update_info(ppngread, ppnginfo);
		png_get_IHDR(
			ppngread, ppnginfo,
			&(pngcp->pfrpng->w), &(pngcp->pfrpng->h), &(pngcp->pfrpng->bd), &(pngcp->pfrpng->ct),
			&(pngcp->pfrpng->im), &(pngcp->pfrpng->cm), &(pngcp->pfrpng->fm)
		);
		(pngcp->back->cf)->bg[0] = dk4pxbit_get_max(pngcp->pfrpng->bd);
		(pngcp->back->cf)->bg[1] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bg[2] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[0] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[1] = (pngcp->back->cf)->bg[1];
		(pngcp->back->cf)->bglbd[2] = (pngcp->back->cf)->bg[2];
		pngcp->pfrpng->ch = png_get_channels(ppngread, ppnginfo);
		/*
			Pass data upwards to frame structure
		*/
		(pngcp->back->cf)->res_x = pngcp->pfrpng->dblxdpi;
		(pngcp->back->cf)->res_y = pngcp->pfrpng->dblydpi;
		(pngcp->back->cf)->dim_x = (dk4_bif_dim_t)(pngcp->pfrpng->w);
		(pngcp->back->cf)->dim_y = (dk4_bif_dim_t)(pngcp->pfrpng->h);
		(pngcp->back->cf)->l_bdepth = (pngcp->back->cf)->r_bdepth = pngcp->pfrpng->bd;
		dk4pxres_setup(&((pngcp->back->cf)->resampler), pngcp->pfrpng->bd, pngcp->pfrpng->bd);
		(pngcp->back->cf)->bg[0] = dk4pxbit_get_max(pngcp->pfrpng->bd);
		(pngcp->back->cf)->bg[1] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bg[2] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[0] = (pngcp->back->cf)->bg[0];
		(pngcp->back->cf)->bglbd[1] = (pngcp->back->cf)->bg[1];
		(pngcp->back->cf)->bglbd[2] = (pngcp->back->cf)->bg[2];
		switch (pngcp->pfrpng->ct) {
			case PNG_COLOR_TYPE_GRAY : {
				(pngcp->back->cf)->l_cs = (pngcp->back->cf)->f_cs = DK4_CS_GRAY;
				(pngcp->back->cf)->n_comp = 1;
			} break;
			case PNG_COLOR_TYPE_GRAY_ALPHA : {
				(pngcp->back->cf)->l_cs = (pngcp->back->cf)->f_cs = DK4_CS_GRAY_ALPHA;
				(pngcp->back->cf)->n_comp = 2;
			} break;
			case PNG_COLOR_TYPE_PALETTE : {
				(pngcp->back->cf)->l_cs = (pngcp->back->cf)->f_cs = DK4_CS_RGB;
				(pngcp->back->cf)->n_comp = 3;
			} break;
			case PNG_COLOR_TYPE_RGB : {
				(pngcp->back->cf)->l_cs = (pngcp->back->cf)->f_cs = DK4_CS_RGB;
				(pngcp->back->cf)->n_comp = 3;
			} break;
			case PNG_COLOR_TYPE_RGB_ALPHA : {
				(pngcp->back->cf)->l_cs = (pngcp->back->cf)->f_cs = DK4_CS_RGB_ALPHA;
				(pngcp->back->cf)->n_comp = 4;
			} break;
			default : {
				pngcp->pfrpng->had_error = 2;
				goto finished;
			} break;
		}
		if ((pngcp->back->cf)->n_comp != (size_t)(pngcp->pfrpng->ch)) {
			pngcp->pfrpng->had_error = 2;
			goto finished;
		}
	}
	else {
		pngcp->pfrpng->had_error = 2;
		dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		goto finished;
	}
	/*	Second reading pass (image data)
	*/
	if (0 != honly) {
		pngcp->ok = 1;
		goto finished;
	}
	if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
		pngcp->pfrpng->rowbytes = png_get_rowbytes(ppngread, ppnginfo);
		pngcp->pfrpng->rows = dk4mem_new(png_bytep,(size_t)(pngcp->pfrpng->h),erp);
		if (NULL == pngcp->pfrpng->rows) {
			goto finished;
		}
		/*	Initialize row pointers
		*/
		for (i = 0; i < (size_t)(pngcp->pfrpng->h); i++) {
			(pngcp->pfrpng->rows)[i] = NULL;
		}
		/*	Allocate row pointers
		*/
		for (i = 0; i < (size_t)(pngcp->pfrpng->h); i++) {
			(pngcp->pfrpng->rows)[i] =
			dk4mem_new(png_byte,(size_t)(pngcp->pfrpng->rowbytes), erp);
			if (NULL == (pngcp->pfrpng->rows)[i]) {
				goto finished;
			}
		}
		/*	Now read image
		*/
		png_read_image(ppngread, pngcp->pfrpng->rows);
		if (png_get_bKGD(ppngread, ppnginfo, &bgp)) {
			if (NULL != bgp) {
				(pngcp->back->cf)->bg[0] = bgp->red;
				(pngcp->back->cf)->bg[1] = bgp->green;
				(pngcp->back->cf)->bg[2] = bgp->blue;
				(pngcp->back->cf)->bglbd[0] = (pngcp->back->cf)->bg[0];
				(pngcp->back->cf)->bglbd[1] = (pngcp->back->cf)->bg[1];
				(pngcp->back->cf)->bglbd[2] = (pngcp->back->cf)->bg[2];
				/*
					Colors in pngcp->background chunk are always 8 bit,
					so we need to rescale.
				*/
				dk4pxres_init(&pxres);
				dk4pxres_setup(&pxres, 8, pngcp->pfrpng->bd);
				dk4pxres_multiple(&((pngcp->back->cf)->bg[0]), 4, &pxres);
				dk4pxres_multiple(&((pngcp->back->cf)->bglbd[0]), 4, &pxres);
				$? ". bglbd[0] = %u", (unsigned)((pngcp->back->cf)->bglbd[0])
				$? ". bglbd[1] = %u", (unsigned)((pngcp->back->cf)->bglbd[1])
				$? ". bglbd[2] = %u", (unsigned)((pngcp->back->cf)->bglbd[2])
				$? ".    bg[0] = %u", (unsigned)((pngcp->back->cf)->bg[0])
				$? ".    bg[1] = %u", (unsigned)((pngcp->back->cf)->bg[1])
				$? ".    bg[2] = %u", (unsigned)((pngcp->back->cf)->bg[2])
				(pngcp->back->cf)->hbg = 1;
				switch ((pngcp->back->cf)->l_cs) {
					case DK4_CS_GRAY_ALPHA : case DK4_CS_GRAY : {
						(pngcp->back->cf)->bg[0] = dk4cs_mix_rgb_to_gray(
							(pngcp->back->cf)->bg[0],
							(pngcp->back->cf)->bg[1],
							(pngcp->back->cf)->bg[2],
							&(pngcp->back->cs_ctx)
						);
						(pngcp->back->cf)->bg[1] = (pngcp->back->cf)->bg[0];
						(pngcp->back->cf)->bg[2] = (pngcp->back->cf)->bg[0];
						(pngcp->back->cf)->bglbd[0] = (pngcp->back->cf)->bg[0];
						(pngcp->back->cf)->bglbd[1] = (pngcp->back->cf)->bg[1];
						(pngcp->back->cf)->bglbd[2] = (pngcp->back->cf)->bg[2];
					}
				}
			}
		}
		pngcp->ok = 1;
	}
	else {
		pngcp->pfrpng->had_error = 2;
		dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		goto finished;
	}
	/*	Indicate success
	*/
	pngcp->ok = 1;

	/*	Clean up and return 
	*/
	finished:
	/*
		Release PNG file reader resources from libpng
	*/
	if (NULL != ppngread) {
		if (NULL != ppnginfo) {
#if	DK4_HAVE_SETJMP_H
			if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
#endif
				png_destroy_info_struct(ppngread,&(ppnginfo));
#if	DK4_HAVE_SETJMP_H
			}
			else {							$? "! error while freeing info"
			}
#endif
			ppnginfo = NULL;
		}
		else {
		}
#if	DK4_HAVE_SETJMP_H
		if (0 == setjmp(pngcp->pfrpng->jump_buf)) {
#endif
			png_destroy_read_struct(
				&(ppngread), (png_infopp)NULL, (png_infopp)NULL
			);
#if	DK4_HAVE_SETJMP_H
		}
		else {								$? "! error while freeing reader"
		}
#endif
		ppngread = NULL;
	}
	else {
	}
	/*	Release result if any error occured.
	*/
	if ((NULL != pngcp->back) && (0 == pngcp->ok)) {		$? "! incomplete"
		dk4bif_close(pngcp->back);
		pngcp->back = NULL;
		dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	}
	$? "- dk4bifpng_nc_open_file %d", TR_IPTR(pngcp->back)
	return pngcp->back;
}



int
dk4bifpng_nc_get_original_pixel(
	dk4_px_t				*dptr,
	dk4_bif_t		const	*bif,
	dk4_bif_dim_t			 rowno,
	dk4_bif_dim_t			 colno
)
{
	dk4_er_t				 er;		/* Error report for math operations */
	dk4_bif_png_per_frame_t	*pfrpng;	/* Per-frame data */
	png_bytep				 rowptr;	/* Address of row data */
	size_t					 si;		/* Start index of pixel data in row */
	size_t					 vi;		/* Index of current sample in row */
	size_t					 i;			/* Traverse all components */
	int						 back	= 0;
	$? "+ dk4bifpng_nc_get_original_pixel"
#if	DK4_USE_ASSERT
	assert(NULL != dptr);
	assert(NULL != bif);
#endif
	pfrpng = (dk4_bif_png_per_frame_t *)((bif->cf)->tsdata);
	dk4error_init(&er);
	si = dk4ma_size_t_mul(colno, pfrpng->ch, &er);
	if ((DK4_E_NONE == er.ec) && ((SIZE_MAX - (size_t)(pfrpng->ch)) >= si)) {
		vi = si;		$? ". row number ok"
		rowptr = (pfrpng->rows)[rowno];
		for (i = 0; i < (size_t)(pfrpng->ch); i++) {
			*(dptr++) = dk4bifpackedbits_get_element(
				rowptr, vi++, pfrpng->bd, pfrpng->rowbytes
			);
		}
		back = 1;
	}
	$? "- dk4bifpng_nc_get_original_pixel %d", back
	return back;
}


#endif
/* if DK4_HAVE_PNG_H */

/* vim: set ai sw=4 ts=4 : */