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include/mupdf/fitz/transition.h

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+#ifndef MUPDF_FITZ_TRANSITION_H
+#define MUPDF_FITZ_TRANSITION_H
+
+#include "mupdf/fitz/system.h"
+#include "mupdf/fitz/pixmap.h"
+
+/* Transition support */
+typedef struct fz_transition_s fz_transition;
+
+enum {
+	FZ_TRANSITION_NONE = 0, /* aka 'R' or 'REPLACE' */
+	FZ_TRANSITION_SPLIT,
+	FZ_TRANSITION_BLINDS,
+	FZ_TRANSITION_BOX,
+	FZ_TRANSITION_WIPE,
+	FZ_TRANSITION_DISSOLVE,
+	FZ_TRANSITION_GLITTER,
+	FZ_TRANSITION_FLY,
+	FZ_TRANSITION_PUSH,
+	FZ_TRANSITION_COVER,
+	FZ_TRANSITION_UNCOVER,
+	FZ_TRANSITION_FADE
+};
+
+struct fz_transition_s
+{
+	int type;
+	float duration; /* Effect duration (seconds) */
+
+	/* Parameters controlling the effect */
+	int vertical; /* 0 or 1 */
+	int outwards; /* 0 or 1 */
+	int direction; /* Degrees */
+	/* Potentially more to come */
+
+	/* State variables for use of the transition code */
+	int state0;
+	int state1;
+};
+
+/*
+	fz_generate_transition: Generate a frame of a transition.
+
+	tpix: Target pixmap
+	opix: Old pixmap
+	npix: New pixmap
+	time: Position within the transition (0 to 256)
+	trans: Transition details
+
+	Returns 1 if successfully generated a frame.
+*/
+int fz_generate_transition(fz_context *ctx, fz_pixmap *tpix, fz_pixmap *opix, fz_pixmap *npix, int time, fz_transition *trans);
+
+#endif