100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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/*
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** thinlib (c) 2001 Matthew Conte (matt@conte.com)
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**
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**
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** tl_bmp.c
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**
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** Bitmap object manipulation routines
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**
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** $Id: $
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tl_types.h"
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#include "tl_bmp.h"
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#define BPP_PITCH(pitch, bpp) ((pitch) * (((bpp) + 7) / 8))
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/* TODO: you can make this faster. */
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void thin_bmp_clear(const bitmap_t *bitmap, uint8 color)
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{
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memset(bitmap->data, color, bitmap->pitch * bitmap->height);
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}
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static bitmap_t *_make_bitmap(uint8 *data_addr, bool hw, int width,
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int height, int bpp, int pitch, int overdraw)
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{
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bitmap_t *bitmap;
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int i;
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/* sometimes our data address is zero; for instance, setting
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** video selectors for VESA mode with far pointers. so we
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** don't want to bail out if we're passed a zero address.
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*/
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/* Make sure to add in space for line pointers */
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bitmap = malloc(sizeof(bitmap_t) + (sizeof(uint8 *) * height));
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if (NULL == bitmap)
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return NULL;
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bitmap->hardware = hw;
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bitmap->height = height;
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bitmap->width = width;
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bitmap->bpp = bpp;
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bitmap->data = data_addr;
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bitmap->pitch = BPP_PITCH(pitch, bpp);
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/* Set up line pointers */
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bitmap->line[0] = bitmap->data + overdraw;
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for (i = 1; i < height; i++)
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bitmap->line[i] = bitmap->line[i - 1] + bitmap->pitch;
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return bitmap;
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}
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/* Allocate and initialize a bitmap structure */
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bitmap_t *thin_bmp_create(int width, int height, int bpp, int overdraw)
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{
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uint8 *addr;
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/* left and right overdraw */
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int pitch = width + (overdraw * 2);
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/* dword align */
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pitch = (pitch + 3) & ~3;
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addr = malloc(height * BPP_PITCH(pitch, bpp));
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if (NULL == addr)
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return NULL;
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return _make_bitmap(addr, false, width, height, bpp, pitch, overdraw);
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}
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/* allocate and initialize a hardware bitmap */
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bitmap_t *thin_bmp_createhw(uint8 *addr, int width, int height, int bpp, int pitch)
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{
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return _make_bitmap(addr, true, width, height, bpp, pitch, 0); /* zero overdraw */
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}
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/* Deallocate space for a bitmap structure */
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void thin_bmp_destroy(bitmap_t **bitmap)
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{
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if (*bitmap)
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{
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if ((*bitmap)->data && false == (*bitmap)->hardware)
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free((*bitmap)->data);
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free(*bitmap);
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*bitmap = NULL;
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}
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}
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/*
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** $Log: $
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*/
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