netsurf/amiga/bitmap.c

222 lines
4.3 KiB
C

/*
* Copyright 2008 Chris Young <chris@unsatisfactorysoftware.co.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "assert.h"
#include "image/bitmap.h"
#include "amiga/bitmap.h"
#include <proto/exec.h>
/**
* Create a bitmap.
*
* \param width width of image in pixels
* \param height width of image in pixels
* \param state a flag word indicating the initial state
* \return an opaque struct bitmap, or NULL on memory exhaustion
*/
void *bitmap_create(int width, int height, unsigned int state)
{
struct bitmap *bitmap;
DebugPrintF("creating bitmap\n");
bitmap = AllocVec(sizeof(struct bitmap),MEMF_CLEAR);
if(bitmap)
{
bitmap->pixdata = AllocVec(width*height*4*2,MEMF_CLEAR);
bitmap->width = width;
bitmap->height = height;
}
return bitmap;
}
/**
* Return a pointer to the pixel data in a bitmap.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return pointer to the pixel buffer
*
* The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end
* of rows. The width of a row in bytes is given by bitmap_get_rowstride().
*/
unsigned char *bitmap_get_buffer(void *bitmap)
{
struct bitmap *bm = bitmap;
return bm->pixdata;
}
/**
* Find the width of a pixel row in bytes.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return width of a pixel row in the bitmap
*/
size_t bitmap_get_rowstride(void *bitmap)
{
struct bitmap *bm = bitmap;
if(bm)
{
return ((bm->width)*4);
}
else
{
return 0;
}
}
/**
* Free a bitmap.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_destroy(void *bitmap)
{
struct bitmap *bm = bitmap;
if(bm)
{
FreeVec(bm->pixdata);
bm->pixdata = NULL;
FreeVec(bm);
bm = NULL;
}
}
/**
* Save a bitmap in the platform's native format.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \param path pathname for file
* \return true on success, false on error and error reported
*/
bool bitmap_save(void *bitmap, const char *path, unsigned flags)
{
return true;
}
/**
* The bitmap image has changed, so flush any persistant cache.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_modified(void *bitmap) {
}
/**
* The bitmap image can be suspended.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \param private_word a private word to be returned later
* \param suspend the function to be called upon suspension
* \param resume the function to be called when resuming
*/
void bitmap_set_suspendable(void *bitmap, void *private_word,
void (*invalidate)(void *bitmap, void *private_word)) {
}
/**
* Sets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \param opaque whether the bitmap should be plotted opaque
*/
void bitmap_set_opaque(void *bitmap, bool opaque)
{
assert(bitmap);
/* todo: set bitmap as opaque */
}
/**
* Tests whether a bitmap has an opaque alpha channel
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return whether the bitmap is opaque
*/
bool bitmap_test_opaque(void *bitmap)
{
assert(bitmap);
/* todo: test if bitmap as opaque */
return false;
}
/**
* Gets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
bool bitmap_get_opaque(void *bitmap)
{
assert(bitmap);
/* todo: get whether bitmap is opaque */
return false;
}
int bitmap_get_width(void *bitmap)
{
struct bitmap *bm = bitmap;
if(bm)
{
return(bm->width);
}
else
{
return 0;
}
}
int bitmap_get_height(void *bitmap)
{
struct bitmap *bm = bitmap;
if(bm)
{
return(bm->height);
}
else
{
return 0;
}
}
size_t bitmap_get_bpp(void *bitmap)
{
if(bitmap)
{
return 32;
}
else
{
return 0;
}
}