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/*
* Copyright 2022 Michael Drake <tlsa@netsurf-browser.org>
*
* 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
* Internal core bitmap interface.
*/
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "utils/log.h"
#include "utils/errors.h"
#include "desktop/bitmap.h"
#include "desktop/gui_internal.h"
/** The client bitmap format. */
bitmap_fmt_t bitmap_fmt;
/** The client bitmap colour channel layout. */
struct bitmap_colour_layout bitmap_layout = {
.r = 0,
.g = 1,
.b = 2,
.a = 3,
};
/**
* Get the colour layout for the given bitmap format.
*
* \param[in] fmt Pixel format to get channel layout for,
* \return channel layout structure.
*/
static struct bitmap_colour_layout bitmap__get_colour_layout(
const bitmap_fmt_t *fmt)
{
switch (fmt->layout) {
default:
/* Fall through. */
case BITMAP_LAYOUT_R8G8B8A8:
return (struct bitmap_colour_layout) {
.r = 0,
.g = 1,
.b = 2,
.a = 3,
};
case BITMAP_LAYOUT_B8G8R8A8:
return (struct bitmap_colour_layout) {
.b = 0,
.g = 1,
.r = 2,
.a = 3,
};
case BITMAP_LAYOUT_A8R8G8B8:
return (struct bitmap_colour_layout) {
.a = 0,
.r = 1,
.g = 2,
.b = 3,
};
case BITMAP_LAYOUT_A8B8G8R8:
return (struct bitmap_colour_layout) {
.a = 0,
.b = 1,
.g = 2,
.r = 3,
};
}
}
/* Exported function, documented in include/netsurf/bitmap.h */
void bitmap_set_format(const bitmap_fmt_t *bitmap_format)
{
bitmap_fmt = *bitmap_format;
bitmap_fmt.layout = bitmap_sanitise_bitmap_layout(bitmap_fmt.layout);
bitmap_layout = bitmap__get_colour_layout(&bitmap_fmt);
}
/**
* Swap colour component order.
*
* \param[in] width Bitmap width in pixels.
* \param[in] height Bitmap height in pixels.
* \param[in] buffer Pixel buffer.
* \param[in] rowstride Pixel buffer row stride in bytes.
* \param[in] to Pixel layout to convert to.
* \param[in] from Pixel layout to convert from.
*/
static inline void bitmap__format_convert(
int width,
int height,
uint8_t *buffer,
size_t rowstride,
struct bitmap_colour_layout to,
struct bitmap_colour_layout from)
{
/* Just swapping the components around */
for (int y = 0; y < height; y++) {
uint8_t *row = buffer;
for (int x = 0; x < width; x++) {
const uint32_t px = *((uint32_t *)(void *) row);
row[to.r] = ((const uint8_t *) &px)[from.r];
row[to.g] = ((const uint8_t *) &px)[from.g];
row[to.b] = ((const uint8_t *) &px)[from.b];
row[to.a] = ((const uint8_t *) &px)[from.a];
row += sizeof(uint32_t);
}
buffer += rowstride;
}
}
/**
* Convert plain alpha to premultiplied alpha.
*
* \param[in] width Bitmap width in pixels.
* \param[in] height Bitmap height in pixels.
* \param[in] buffer Pixel buffer.
* \param[in] rowstride Pixel buffer row stride in bytes.
* \param[in] to Pixel layout to convert to.
* \param[in] from Pixel layout to convert from.
*/
static inline void bitmap__format_convert_to_pma(
int width,
int height,
uint8_t *buffer,
size_t rowstride,
struct bitmap_colour_layout to,
struct bitmap_colour_layout from)
{
for (int y = 0; y < height; y++) {
uint8_t *row = buffer;
for (int x = 0; x < width; x++) {
const uint32_t px = *((uint32_t *)(void *) row);
uint32_t a, r, g, b;
r = ((const uint8_t *) &px)[from.r];
g = ((const uint8_t *) &px)[from.g];
b = ((const uint8_t *) &px)[from.b];
a = ((const uint8_t *) &px)[from.a];
if (a != 0) {
r = ((r * (a + 1)) >> 8) & 0xff;
g = ((g * (a + 1)) >> 8) & 0xff;
b = ((b * (a + 1)) >> 8) & 0xff;
} else {
r = g = b = 0;
}
row[to.r] = r;
row[to.g] = g;
row[to.b] = b;
row[to.a] = a;
row += sizeof(uint32_t);
}
buffer += rowstride;
}
}
/**
* Convert from premultiplied alpha to plain alpha.
*
* \param[in] width Bitmap width in pixels.
* \param[in] height Bitmap height in pixels.
* \param[in] buffer Pixel buffer.
* \param[in] rowstride Pixel buffer row stride in bytes.
* \param[in] to Pixel layout to convert to.
* \param[in] from Pixel layout to convert from.
*/
static inline void bitmap__format_convert_from_pma(
int width,
int height,
uint8_t *buffer,
size_t rowstride,
struct bitmap_colour_layout to,
struct bitmap_colour_layout from)
{
for (int y = 0; y < height; y++) {
uint8_t *row = buffer;
for (int x = 0; x < width; x++) {
const uint32_t px = *((uint32_t *)(void *) row);
uint32_t a, r, g, b;
r = ((const uint8_t *) &px)[from.r];
g = ((const uint8_t *) &px)[from.g];
b = ((const uint8_t *) &px)[from.b];
a = ((const uint8_t *) &px)[from.a];
if (a != 0) {
r = (r << 8) / a;
g = (g << 8) / a;
b = (b << 8) / a;
r = (r > 255) ? 255 : r;
g = (g > 255) ? 255 : g;
b = (b > 255) ? 255 : b;
} else {
r = g = b = 0;
}
row[to.r] = r;
row[to.g] = g;
row[to.b] = b;
row[to.a] = a;
row += sizeof(uint32_t);
}
buffer += rowstride;
}
}
/* Exported function, documented in desktop/bitmap.h */
void bitmap_format_convert(void *bitmap,
const bitmap_fmt_t *fmt_from,
const bitmap_fmt_t *fmt_to)
{
int width = guit->bitmap->get_width(bitmap);
int height = guit->bitmap->get_height(bitmap);
bool opaque = guit->bitmap->get_opaque(bitmap);
uint8_t *buffer = guit->bitmap->get_buffer(bitmap);
size_t rowstride = guit->bitmap->get_rowstride(bitmap);
struct bitmap_colour_layout to = bitmap__get_colour_layout(fmt_to);
struct bitmap_colour_layout from = bitmap__get_colour_layout(fmt_from);
NSLOG(netsurf, DEEPDEBUG, "%p: format conversion (%u%s --> %u%s)",
bitmap,
fmt_from->layout, fmt_from->pma ? " pma" : "",
fmt_to->layout, fmt_to->pma ? " pma" : "");
if (fmt_from->pma == fmt_to->pma) {
/* Just component order to switch. */
bitmap__format_convert(
width, height, buffer,
rowstride, to, from);
} else if (opaque == false) {
/* Need to do conversion to/from premultiplied alpha. */
if (fmt_to->pma) {
bitmap__format_convert_to_pma(
width, height, buffer,
rowstride, to, from);
} else {
bitmap__format_convert_from_pma(
width, height, buffer,
rowstride, to, from);
}
}
}
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