netsurf/beos/bitmap.cpp
2015-04-17 00:29:58 +01:00

424 lines
11 KiB
C++

/*
* Copyright 2008 François Revol <mmu_man@users.sourceforge.net>
*
* 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/>.
*/
/** \file
* Generic bitmap handling (BeOS implementation).
*
* This implements the interface given by desktop/bitmap.h using BBitmap.
*/
#define __STDBOOL_H__ 1
//#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include <Bitmap.h>
#include <BitmapStream.h>
#include <File.h>
#include <GraphicsDefs.h>
#include <TranslatorFormats.h>
#include <TranslatorRoster.h>
extern "C" {
#include "content/content.h"
#include "image/bitmap.h"
#include "utils/log.h"
}
#include "beos/bitmap.h"
#include "beos/gui.h"
#include "beos/scaffolding.h"
struct bitmap {
BBitmap *primary;
BBitmap *shadow; // in NetSurf's ABGR order
BBitmap *pretile_x;
BBitmap *pretile_y;
BBitmap *pretile_xy;
bool opaque;
};
#define MIN_PRETILE_WIDTH 256
#define MIN_PRETILE_HEIGHT 256
#warning TODO: check rgba order
#warning TODO: add correct locking (not strictly required)
/**
* Convert to BeOS RGBA32_LITTLE (strictly BGRA) from NetSurf's favoured ABGR format.
*
* Copies the converted data elsewhere. Operation is rotate left 8 bits.
*
* \param src Source 32-bit pixels arranged in ABGR order.
* \param dst Output data in BGRA order.
* \param width Width of the bitmap
* \param height Height of the bitmap
* \param rowstride Number of bytes to skip after each row (this implementation
* requires this to be a multiple of 4.)
*/
static inline void nsbeos_rgba_to_bgra(void *src,
void *dst,
int width,
int height,
size_t rowstride)
{
struct abgr { uint8 a, b, g, r; };
struct rgba { uint8 r, g, b ,a; };
struct bgra { uint8 b, g, r, a; };
struct rgba *from = (struct rgba *)src;
struct bgra *to = (struct bgra *)dst;
rowstride >>= 2;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
to[x].b = from[x].b;
to[x].g = from[x].g;
to[x].r = from[x].r;
to[x].a = from[x].a;
/*
if (from[x].a == 0)
*(rgb_color *)&to[x] = B_TRANSPARENT_32_BIT;
*/
}
from += rowstride;
to += rowstride;
}
}
/**
* 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 *bmp = (struct bitmap *)malloc(sizeof(struct bitmap));
if (bmp == NULL)
return NULL;
int32 flags = 0;
if (state & BITMAP_CLEAR_MEMORY)
flags |= B_BITMAP_CLEAR_TO_WHITE;
BRect frame(0, 0, width - 1, height - 1);
//XXX: bytes per row ?
bmp->primary = new BBitmap(frame, flags, B_RGBA32);
bmp->shadow = new BBitmap(frame, flags, B_RGBA32);
bmp->pretile_x = bmp->pretile_y = bmp->pretile_xy = NULL;
bmp->opaque = (state & BITMAP_OPAQUE) != 0;
return bmp;
}
/**
* Sets whether a bitmap should be plotted opaque
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \param opaque whether the bitmap should be plotted opaque
*/
void bitmap_set_opaque(void *vbitmap, bool opaque)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
bitmap->opaque = opaque;
}
/**
* Tests whether a bitmap has an opaque alpha channel
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \return whether the bitmap is opaque
*/
bool bitmap_test_opaque(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
/* todo: test if bitmap is opaque */
return false;
}
/**
* Gets whether a bitmap should be plotted opaque
*
* \param vbitmap a bitmap, as returned by bitmap_create()
*/
bool bitmap_get_opaque(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
return bitmap->opaque;
}
/**
* Return a pointer to the pixel data in a bitmap.
*
* \param vbitmap 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 *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
return (unsigned char *)(bitmap->shadow->Bits());
}
/**
* Find the width of a pixel row in bytes.
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \return width of a pixel row in the bitmap
*/
size_t bitmap_get_rowstride(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
return (bitmap->primary->BytesPerRow());
}
/**
* Find the bytes per pixels of a bitmap.
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \return bytes per pixels of the bitmap
*/
size_t bitmap_get_bpp(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
return 4;
}
static void
nsbeos_bitmap_free_pretiles(struct bitmap *bitmap)
{
#define FREE_TILE(XY) if (bitmap->pretile_##XY) delete (bitmap->pretile_##XY); bitmap->pretile_##XY = NULL
FREE_TILE(x);
FREE_TILE(y);
FREE_TILE(xy);
#undef FREE_TILE
}
/**
* Free a bitmap.
*
* \param vbitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_destroy(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
assert(bitmap);
nsbeos_bitmap_free_pretiles(bitmap);
delete bitmap->primary;
delete bitmap->shadow;
free(bitmap);
}
/**
* Save a bitmap in the platform's native format.
*
* \param vbitmap a bitmap, as returned by bitmap_create()
* \param path pathname for file
* \param flags modify the behaviour of the save
* \return true on success, false on error and error reported
*/
bool bitmap_save(void *vbitmap, const char *path, unsigned flags)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
BTranslatorRoster *roster = BTranslatorRoster::Default();
BBitmapStream stream(bitmap->primary);
BFile file(path, B_WRITE_ONLY | B_CREATE_FILE);
uint32 type = B_PNG_FORMAT;
if (file.InitCheck() < B_OK)
return false;
if (roster->Translate(&stream, NULL, NULL, &file, type) < B_OK)
return false;
return true;
}
/**
* The bitmap image has changed, so flush any persistant cache.
*
* \param vbitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_modified(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
// convert the shadow (ABGR) to into the primary bitmap
nsbeos_rgba_to_bgra(bitmap->shadow->Bits(), bitmap->primary->Bits(),
bitmap->primary->Bounds().Width() + 1,
bitmap->primary->Bounds().Height() + 1,
bitmap->primary->BytesPerRow());
nsbeos_bitmap_free_pretiles(bitmap);
}
int bitmap_get_width(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
return bitmap->primary->Bounds().Width() + 1;
}
int bitmap_get_height(void *vbitmap)
{
struct bitmap *bitmap = (struct bitmap *)vbitmap;
return bitmap->primary->Bounds().Height() + 1;
}
static BBitmap *
nsbeos_bitmap_generate_pretile(BBitmap *primary, int repeat_x, int repeat_y)
{
int width = primary->Bounds().Width() + 1;
int height = primary->Bounds().Height() + 1;
size_t primary_stride = primary->BytesPerRow();
BRect frame(0, 0, width * repeat_x - 1, height * repeat_y - 1);
BBitmap *result = new BBitmap(frame, 0, B_RGBA32);
char *target_buffer = (char *)result->Bits();
int x,y,row;
/* This algorithm won't work if the strides are not multiples */
assert((size_t)(result->BytesPerRow()) ==
(primary_stride * repeat_x));
if (repeat_x == 1 && repeat_y == 1) {
delete result;
// just return a copy
return new BBitmap(primary);
}
for (y = 0; y < repeat_y; ++y) {
char *primary_buffer = (char *)primary->Bits();
for (row = 0; row < height; ++row) {
for (x = 0; x < repeat_x; ++x) {
memcpy(target_buffer,
primary_buffer, primary_stride);
target_buffer += primary_stride;
}
primary_buffer += primary_stride;
}
}
return result;
}
/**
* The primary image associated with this bitmap object.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
BBitmap *
nsbeos_bitmap_get_primary(struct bitmap* bitmap)
{
return bitmap->primary;
}
/**
* The X-pretiled image associated with this bitmap object.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
BBitmap *
nsbeos_bitmap_get_pretile_x(struct bitmap* bitmap)
{
if (!bitmap->pretile_x) {
int width = bitmap->primary->Bounds().Width() + 1;
int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
LOG(("Pretiling %p for X*%d", bitmap, xmult));
bitmap->pretile_x = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, 1);
}
return bitmap->pretile_x;
}
/**
* The Y-pretiled image associated with this bitmap object.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
BBitmap *
nsbeos_bitmap_get_pretile_y(struct bitmap* bitmap)
{
if (!bitmap->pretile_y) {
int height = bitmap->primary->Bounds().Height() + 1;
int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
LOG(("Pretiling %p for Y*%d", bitmap, ymult));
bitmap->pretile_y = nsbeos_bitmap_generate_pretile(bitmap->primary, 1, ymult);
}
return bitmap->pretile_y;
}
/**
* The XY-pretiled image associated with this bitmap object.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
BBitmap *
nsbeos_bitmap_get_pretile_xy(struct bitmap* bitmap)
{
if (!bitmap->pretile_xy) {
int width = bitmap->primary->Bounds().Width() + 1;
int height = bitmap->primary->Bounds().Height() + 1;
int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
LOG(("Pretiling %p for X*%d Y*%d", bitmap, xmult, ymult));
bitmap->pretile_xy = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, ymult);
}
return bitmap->pretile_xy;
}
static struct gui_bitmap_table bitmap_table = {
.create = bitmap_create,
.destroy = bitmap_destroy,
.set_opaque = bitmap_set_opaque,
.get_opaque = bitmap_get_opaque,
.test_opaque = bitmap_test_opaque,
.get_buffer = bitmap_get_buffer,
.get_rowstride = bitmap_get_rowstride,
.get_width = bitmap_get_width,
.get_height = bitmap_get_height,
.get_bpp = bitmap_get_bpp,
.save = bitmap_save,
.modified = bitmap_modified,
};
struct gui_bitmap_table *beos_bitmap_table = &bitmap_table;