first commit

include/mupdf/fitz/band-writer.h

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+#ifndef MUPDF_FITZ_BAND_WRITER_H
+#define MUPDF_FITZ_BAND_WRITER_H
+
+#include "mupdf/fitz/system.h"
+#include "mupdf/fitz/context.h"
+#include "mupdf/fitz/output.h"
+
+/*
+	fz_band_writer
+*/
+typedef struct fz_band_writer_s fz_band_writer;
+
+typedef void (fz_write_header_fn)(fz_context *ctx, fz_band_writer *writer, const fz_colorspace *cs);
+typedef void (fz_write_band_fn)(fz_context *ctx, fz_band_writer *writer, int stride, int band_start, int band_height, const unsigned char *samples);
+typedef void (fz_write_trailer_fn)(fz_context *ctx, fz_band_writer *writer);
+typedef void (fz_drop_band_writer_fn)(fz_context *ctx, fz_band_writer *writer);
+
+struct fz_band_writer_s
+{
+	fz_drop_band_writer_fn *drop;
+	fz_write_header_fn *header;
+	fz_write_band_fn *band;
+	fz_write_trailer_fn *trailer;
+	fz_output *out;
+	int w;
+	int h;
+	int n;
+	int s;
+	int alpha;
+	int xres;
+	int yres;
+	int pagenum;
+	int line;
+	fz_separations *seps;
+};
+
+fz_band_writer *fz_new_band_writer_of_size(fz_context *ctx, size_t size, fz_output *out);
+#define fz_new_band_writer(C,M,O) ((M *)Memento_label(fz_new_band_writer_of_size(ctx, sizeof(M), O), #M))
+
+/*
+	fz_write_header: Cause a band writer to write the header for
+	a banded image with the given properties/dimensions etc. This
+	also configures the bandwriter for the format of the data to be
+	passed in future calls.
+
+	w, h: Width and Height of the entire page.
+
+	n: Number of components (including spots and alphas).
+
+	alpha: Number of alpha components.
+
+	xres, yres: X and Y resolutions in dpi.
+
+	pagenum: Page number
+
+	cs: Colorspace (NULL for bitmaps)
+
+	seps: Separation details (or NULL).
+
+	Throws exception if incompatible data format.
+*/
+void fz_write_header(fz_context *ctx, fz_band_writer *writer, int w, int h, int n, int alpha, int xres, int yres, int pagenum, const fz_colorspace *cs, fz_separations *seps);
+
+/*
+	fz_write_band: Cause a band writer to write the next band
+	of data for an image.
+
+	stride: The byte offset from the first byte of the data
+	for a pixel to the first byte of the data for the same pixel
+	on the row below.
+
+	band_height: The number of lines in this band.
+
+	samples: Pointer to first byte of the data.
+*/
+void fz_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_height, const unsigned char *samples);
+
+void fz_drop_band_writer(fz_context *ctx, fz_band_writer *writer);
+
+#endif