author | Tero Marttila <terom@fixme.fi> |
Wed, 27 Aug 2008 10:11:44 +0300 | |
changeset 39 | 0e21a65074a6 |
parent 27 | 1e79b4cc8f1b |
permissions | -rw-r--r-- |
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#ifndef RENDER_H |
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#define RENDER_H |
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#include <sys/types.h> |
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#include <stdio.h> |
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/* |
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* This module provides various ways to render mandelbrot images in various formats |
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*/ |
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/* |
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* Custom callbacks |
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* |
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* These should return non-zero on error, whereupon the rendering will be aborted, or zero on success |
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*/ |
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typedef int (*render_ctx_write_cb)(const unsigned char *data, size_t length, void *arg); |
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typedef int (*render_ctx_flush_cb)(void *arg); |
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typedef int (*render_ctx_row_cb)(void *arg, unsigned char *rowbuf); |
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typedef int (*render_ctx_done_cb)(void *arg); |
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// include render_internal.h first if you need it |
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struct render; |
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// output types |
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enum { |
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RENDER_RAW, // raw pixel data |
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RENDER_PNG, // a png image |
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}; |
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/* |
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* Alloc a new render context |
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*/ |
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struct render *render_alloc (); |
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void render_free(struct render *ctx); |
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/* |
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* Clear out the value of the given render context |
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*/ |
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int render_init (struct render *ctx); |
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/* |
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* What kind of image to render, PNG or RAW? |
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*/ |
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int render_set_mode (struct render *ctx, int mode); |
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/* |
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* What size of image to render |
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*/ |
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int render_set_size (struct render *ctx, u_int32_t img_w, u_int32_t img_h); |
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int render_get_size (struct render *ctx, u_int32_t *img_w, u_int32_t *img_h); |
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/* |
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* Select what region to render |
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*/ |
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// the "full" mandelbrot region |
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#define REGION_X1 -2.0 |
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#define REGION_Y1 -1.5 |
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#define REGION_X2 1.0 |
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#define REGION_Y2 1.5 |
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#define REGION_W (REGION_X2 - REGION_X1) |
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#define REGION_H (REGION_Y2 - REGION_Y1) |
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int render_region_full (struct render *ctx); |
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int render_region_raw (struct render *ctx, double x1, double y1, double x2, double y2); |
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/* |
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* Render raw pixel data directly to local memory. |
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* |
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* rowbuf_addr should point to a memory address that the mandelbrot will be |
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* rendered into. This memory address should have room for <img_w> bytes. |
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* |
082bfaf38cf0
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* row_fn will be called after each row has been written, passing in arg and |
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* *rowbuf_addr as arguments. |
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* |
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*/ |
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int render_local_mem (struct render *ctx, unsigned char **rowbuf_addr, render_ctx_row_cb row_fn, void *arg); |
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/* |
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* How to handle the I/O |
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*/ |
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int render_io_custom (struct render *ctx, render_ctx_write_cb write_fn, render_ctx_flush_cb flush_fn, void *arg); |
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int render_io_stream (struct render *ctx, FILE *fh); |
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#endif /* RENDER_H */ |