netsurf/amiga/bitmap.c

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/*
* Copyright 2008, 2009 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 "amiga/os3support.h"
#include "assert.h"
#include "amiga/bitmap.h"
#include <proto/exec.h>
#include <proto/Picasso96API.h>
#ifdef __amigaos4__
#include <graphics/blitattr.h>
#include <graphics/composite.h>
#endif
#include <graphics/gfxbase.h>
#include "amiga/options.h"
#include <proto/datatypes.h>
#include <datatypes/pictureclass.h>
#include <proto/dos.h>
#include <proto/intuition.h>
#include "utils/messages.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;
bitmap = AllocVec(sizeof(struct bitmap),MEMF_PRIVATE | MEMF_CLEAR);
if(bitmap)
{
bitmap->pixdata = AllocVecTags(width*height*4,
AVT_Type,MEMF_PRIVATE,
AVT_ClearWithValue,0xff,
TAG_DONE);
bitmap->width = width;
bitmap->height = height;
if(state & BITMAP_OPAQUE) bitmap->opaque = true;
else bitmap->opaque = false;
}
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)
{
if(bm->nativebm) p96FreeBitMap(bm->nativebm);
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)
{
int err = 0;
Object *dto = NULL;
if(dto = ami_datatype_object_from_bitmap(bitmap))
{
err = SaveDTObjectA(dto, NULL, NULL, path, DTWM_IFF, FALSE, NULL);
DisposeDTObject(dto);
}
if(err == 0) return false;
else 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) {
struct bitmap *bm = bitmap;
p96FreeBitMap(bm->nativebm);
bm->nativebm = NULL;
}
/**
* 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)
{
struct bitmap *bm = bitmap;
assert(bitmap);
bm->opaque = 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)
{
struct bitmap *bm = bitmap;
uint32 p = bm->width * bm->height;
uint32 a = 0;
uint32 *bmi = bm->pixdata;
assert(bitmap);
for(a=0;a<p;a+=4)
{
if ((*bmi & 0x000000ffU) != 0x000000ffU) return false;
bmi++;
}
return true;
}
/**
* Gets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
bool bitmap_get_opaque(void *bitmap)
{
struct bitmap *bm = bitmap;
assert(bitmap);
return bm->opaque;
}
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;
}
}
/**
* Find the bytes per pixel of a bitmap
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \return bytes per pixel
*/
size_t bitmap_get_bpp(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
return 4;
}
Object *ami_datatype_object_from_bitmap(struct bitmap *bitmap)
{
Object *dto;
struct BitMapHeader *bmhd;
if(dto = NewDTObject(NULL,
DTA_SourceType,DTST_RAM,
DTA_GroupID,GID_PICTURE,
//DTA_BaseName,"ilbm",
PDTA_DestMode,PMODE_V43,
TAG_DONE))
{
if(GetDTAttrs(dto,PDTA_BitMapHeader,&bmhd,TAG_DONE))
{
bmhd->bmh_Width = (UWORD)bitmap_get_width(bitmap);
bmhd->bmh_Height = (UWORD)bitmap_get_height(bitmap);
bmhd->bmh_Depth = (UBYTE)bitmap_get_bpp(bitmap) * 8;
if(!bitmap_get_opaque(bitmap)) bmhd->bmh_Masking = mskHasAlpha;
}
SetDTAttrs(dto,NULL,NULL,
DTA_ObjName,bitmap->url,
DTA_ObjAnnotation,bitmap->title,
DTA_ObjAuthor,messages_get("NetSurf"),
DTA_NominalHoriz,bitmap_get_width(bitmap),
DTA_NominalVert,bitmap_get_height(bitmap),
PDTA_SourceMode,PMODE_V43,
TAG_DONE);
IDoMethod(dto,PDTM_WRITEPIXELARRAY,bitmap_get_buffer(bitmap),
PBPAFMT_RGBA,bitmap_get_rowstride(bitmap),0,0,
bitmap_get_width(bitmap),bitmap_get_height(bitmap));
}
return dto;
}
struct BitMap *ami_getcachenativebm(struct bitmap *bitmap,int width,int height,struct BitMap *friendbm)
{
struct RenderInfo ri;
struct BitMap *tbm = NULL;
struct RastPort trp;
if(!bitmap) return NULL;
if(bitmap->nativebm)
{
if((bitmap->nativebmwidth == width) && (bitmap->nativebmheight==height))
{
tbm = bitmap->nativebm;
return tbm;
}
else if((bitmap->nativebmwidth == bitmap->width) && (bitmap->nativebmheight==bitmap->height))
{
tbm = bitmap->nativebm;
}
else
{
if(bitmap->nativebm) p96FreeBitMap(bitmap->nativebm);
bitmap->nativebm = NULL;
}
}
if(!tbm)
{
ri.Memory = bitmap->pixdata;
ri.BytesPerRow = bitmap->width * 4;
ri.RGBFormat = AMI_BITMAP_FORMAT;
if(tbm = p96AllocBitMap(bitmap->width, bitmap->height, 32, 0,
friendbm, AMI_BITMAP_FORMAT))
{
InitRastPort(&trp);
trp.BitMap = tbm;
p96WritePixelArray((struct RenderInfo *)&ri, 0, 0, &trp, 0, 0,
bitmap->width, bitmap->height);
}
if(option_cache_bitmaps == 2)
{
bitmap->nativebm = tbm;
bitmap->nativebmwidth = bitmap->width;
bitmap->nativebmheight = bitmap->height;
}
}
if((bitmap->width != width) || (bitmap->height != height))
{
struct BitMap *scaledbm;
struct BitScaleArgs bsa;
scaledbm = p96AllocBitMap(width, height, 32, BMF_DISPLAYABLE,
friendbm, AMI_BITMAP_FORMAT);
if(GfxBase->LibNode.lib_Version >= 53) // AutoDoc says v52, but this function isn't in OS4.0, so checking for v53 (OS4.1)
{
uint32 comptype = COMPOSITE_Src;
uint32 flags = 0;
if(bitmap->opaque) flags |= COMPFLAG_IgnoreDestAlpha;
if(option_scale_quality) flags |= COMPFLAG_SrcFilter;
CompositeTags(comptype,tbm,scaledbm,
COMPTAG_ScaleX,COMP_FLOAT_TO_FIX(width/bitmap->width),
COMPTAG_ScaleY,COMP_FLOAT_TO_FIX(height/bitmap->height),
COMPTAG_Flags, flags,
COMPTAG_DestX,0,
COMPTAG_DestY,0,
COMPTAG_DestWidth,width,
COMPTAG_DestHeight,height,
COMPTAG_OffsetX,0,
COMPTAG_OffsetY,0,
COMPTAG_FriendBitMap,friendbm,
TAG_DONE);
}
else /* do it the old-fashioned way. This is pretty slow, but probably
uses Composite() on OS4.1 anyway, so we're only saving a blit really. */
{
bsa.bsa_SrcX = 0;
bsa.bsa_SrcY = 0;
bsa.bsa_SrcWidth = bitmap->width;
bsa.bsa_SrcHeight = bitmap->height;
bsa.bsa_DestX = 0;
bsa.bsa_DestY = 0;
// bsa.bsa_DestWidth = width;
// bsa.bsa_DestHeight = height;
bsa.bsa_XSrcFactor = bitmap->width;
bsa.bsa_XDestFactor = width;
bsa.bsa_YSrcFactor = bitmap->height;
bsa.bsa_YDestFactor = height;
bsa.bsa_SrcBitMap = tbm;
bsa.bsa_DestBitMap = scaledbm;
bsa.bsa_Flags = 0;
BitMapScale(&bsa);
}
if(bitmap->nativebm != tbm) p96FreeBitMap(bitmap->nativebm);
p96FreeBitMap(tbm);
tbm = scaledbm;
bitmap->nativebm = NULL;
if(option_cache_bitmaps >= 1)
{
bitmap->nativebm = tbm;
bitmap->nativebmwidth = width;
bitmap->nativebmheight = height;
}
}
return tbm;
}