mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-05 20:31:54 +03:00
541 lines
14 KiB
C
541 lines
14 KiB
C
/*
|
|
* Copyright 2004 James Bursa <bursa@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 (GDK / GTK+ implementation).
|
|
*
|
|
* This implements the interface given by desktop/bitmap.h using GdkPixbufs.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <cairo.h>
|
|
#include <gtk/gtk.h>
|
|
|
|
#include "utils/utils.h"
|
|
#include "utils/errors.h"
|
|
#include "netsurf/content.h"
|
|
#include "netsurf/bitmap.h"
|
|
#include "netsurf/plotters.h"
|
|
|
|
#include "gtk/scaffolding.h"
|
|
#include "gtk/plotters.h"
|
|
#include "gtk/bitmap.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
|
|
*/
|
|
static void *bitmap_create(int width, int height, unsigned int state)
|
|
{
|
|
struct bitmap *gbitmap;
|
|
|
|
gbitmap = calloc(1, sizeof(struct bitmap));
|
|
if (gbitmap != NULL) {
|
|
if ((state & BITMAP_OPAQUE) != 0) {
|
|
gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
|
|
} else {
|
|
gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
|
|
}
|
|
|
|
if (cairo_surface_status(gbitmap->surface) != CAIRO_STATUS_SUCCESS) {
|
|
cairo_surface_destroy(gbitmap->surface);
|
|
free(gbitmap);
|
|
gbitmap = NULL;
|
|
}
|
|
}
|
|
|
|
return gbitmap;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static void bitmap_set_opaque(void *vbitmap, bool opaque)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
cairo_format_t fmt;
|
|
cairo_surface_t *nsurface = NULL;
|
|
|
|
assert(gbitmap);
|
|
|
|
fmt = cairo_image_surface_get_format(gbitmap->surface);
|
|
if (fmt == CAIRO_FORMAT_RGB24) {
|
|
if (opaque == false) {
|
|
/* opaque to transparent */
|
|
nsurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
|
|
cairo_image_surface_get_width(gbitmap->surface),
|
|
cairo_image_surface_get_height(gbitmap->surface));
|
|
|
|
}
|
|
|
|
} else {
|
|
if (opaque == true) {
|
|
/* transparent to opaque */
|
|
nsurface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
|
|
cairo_image_surface_get_width(gbitmap->surface),
|
|
cairo_image_surface_get_height(gbitmap->surface));
|
|
|
|
}
|
|
}
|
|
|
|
if (nsurface != NULL) {
|
|
if (cairo_surface_status(nsurface) != CAIRO_STATUS_SUCCESS) {
|
|
cairo_surface_destroy(nsurface);
|
|
} else {
|
|
memcpy(cairo_image_surface_get_data(nsurface),
|
|
cairo_image_surface_get_data(gbitmap->surface),
|
|
cairo_image_surface_get_stride(gbitmap->surface) * cairo_image_surface_get_height(gbitmap->surface));
|
|
cairo_surface_destroy(gbitmap->surface);
|
|
gbitmap->surface = nsurface;
|
|
|
|
cairo_surface_mark_dirty(gbitmap->surface);
|
|
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Tests whether a bitmap has an opaque alpha channel
|
|
*
|
|
* \param vbitmap a bitmap, as returned by bitmap_create()
|
|
* \return whether the bitmap is opaque
|
|
*/
|
|
static bool bitmap_test_opaque(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
unsigned char *pixels;
|
|
int pcount;
|
|
int ploop;
|
|
|
|
assert(gbitmap);
|
|
|
|
pixels = cairo_image_surface_get_data(gbitmap->surface);
|
|
|
|
pcount = cairo_image_surface_get_stride(gbitmap->surface) *
|
|
cairo_image_surface_get_height(gbitmap->surface);
|
|
|
|
for (ploop = 3; ploop < pcount; ploop += 4) {
|
|
if (pixels[ploop] != 0xff) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* Gets whether a bitmap should be plotted opaque
|
|
*
|
|
* \param vbitmap a bitmap, as returned by bitmap_create()
|
|
*/
|
|
static bool bitmap_get_opaque(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
cairo_format_t fmt;
|
|
|
|
assert(gbitmap);
|
|
|
|
fmt = cairo_image_surface_get_format(gbitmap->surface);
|
|
if (fmt == CAIRO_FORMAT_RGB24) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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().
|
|
*/
|
|
static unsigned char *bitmap_get_buffer(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
int pixel_loop;
|
|
int pixel_count;
|
|
uint8_t *pixels;
|
|
uint32_t t, r, g, b;
|
|
cairo_format_t fmt;
|
|
|
|
assert(gbitmap);
|
|
|
|
cairo_surface_flush(gbitmap->surface);
|
|
pixels = cairo_image_surface_get_data(gbitmap->surface);
|
|
|
|
if (!gbitmap->converted)
|
|
return pixels;
|
|
|
|
fmt = cairo_image_surface_get_format(gbitmap->surface);
|
|
pixel_count = cairo_image_surface_get_width(gbitmap->surface) *
|
|
cairo_image_surface_get_height(gbitmap->surface);
|
|
|
|
if (fmt == CAIRO_FORMAT_RGB24) {
|
|
/* Opaque image */
|
|
for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
|
|
/* Cairo surface is ARGB, written in native endian */
|
|
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
|
|
b = pixels[4 * pixel_loop + 0];
|
|
g = pixels[4 * pixel_loop + 1];
|
|
r = pixels[4 * pixel_loop + 2];
|
|
t = pixels[4 * pixel_loop + 3];
|
|
#else
|
|
t = pixels[4 * pixel_loop + 0];
|
|
r = pixels[4 * pixel_loop + 1];
|
|
g = pixels[4 * pixel_loop + 2];
|
|
b = pixels[4 * pixel_loop + 3];
|
|
#endif
|
|
|
|
/* Core bitmaps always have a component order of rgba,
|
|
* regardless of system endianness */
|
|
pixels[4 * pixel_loop + 0] = r;
|
|
pixels[4 * pixel_loop + 1] = g;
|
|
pixels[4 * pixel_loop + 2] = b;
|
|
pixels[4 * pixel_loop + 3] = t;
|
|
}
|
|
} else {
|
|
/* Alpha image: de-multiply alpha */
|
|
for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
|
|
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
|
|
b = pixels[4 * pixel_loop + 0];
|
|
g = pixels[4 * pixel_loop + 1];
|
|
r = pixels[4 * pixel_loop + 2];
|
|
t = pixels[4 * pixel_loop + 3];
|
|
#else
|
|
t = pixels[4 * pixel_loop + 0];
|
|
r = pixels[4 * pixel_loop + 1];
|
|
g = pixels[4 * pixel_loop + 2];
|
|
b = pixels[4 * pixel_loop + 3];
|
|
#endif
|
|
|
|
if (t != 0) {
|
|
r = (r << 8) / t;
|
|
g = (g << 8) / t;
|
|
b = (b << 8) / t;
|
|
|
|
r = (r > 255) ? 255 : r;
|
|
g = (g > 255) ? 255 : g;
|
|
b = (b > 255) ? 255 : b;
|
|
} else {
|
|
r = g = b = 0;
|
|
}
|
|
|
|
pixels[4 * pixel_loop + 0] = r;
|
|
pixels[4 * pixel_loop + 1] = g;
|
|
pixels[4 * pixel_loop + 2] = b;
|
|
pixels[4 * pixel_loop + 3] = t;
|
|
}
|
|
}
|
|
|
|
gbitmap->converted = false;
|
|
|
|
return (unsigned char *) pixels;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static size_t bitmap_get_rowstride(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
return cairo_image_surface_get_stride(gbitmap->surface);
|
|
}
|
|
|
|
|
|
/**
|
|
* Find the bytes per pixel of a bitmap
|
|
*
|
|
* \param vbitmap a bitmap, as returned by bitmap_create()
|
|
* \return bytes per pixel
|
|
*/
|
|
static size_t bitmap_get_bpp(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
return 4;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Free a bitmap.
|
|
*
|
|
* \param vbitmap a bitmap, as returned by bitmap_create()
|
|
*/
|
|
static void bitmap_destroy(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
if (gbitmap->surface != NULL) {
|
|
cairo_surface_destroy(gbitmap->surface);
|
|
}
|
|
if (gbitmap->scsurface != NULL) {
|
|
cairo_surface_destroy(gbitmap->scsurface);
|
|
}
|
|
free(gbitmap);
|
|
}
|
|
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static bool bitmap_save(void *vbitmap, const char *path, unsigned flags)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* The bitmap image has changed, so flush any persistant cache.
|
|
*
|
|
* \param vbitmap a bitmap, as returned by bitmap_create()
|
|
*/
|
|
static void bitmap_modified(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
int pixel_loop;
|
|
int pixel_count;
|
|
uint8_t *pixels;
|
|
uint32_t t, r, g, b;
|
|
cairo_format_t fmt;
|
|
|
|
assert(gbitmap);
|
|
|
|
fmt = cairo_image_surface_get_format(gbitmap->surface);
|
|
|
|
pixel_count = cairo_image_surface_get_width(gbitmap->surface) *
|
|
cairo_image_surface_get_height(gbitmap->surface);
|
|
pixels = cairo_image_surface_get_data(gbitmap->surface);
|
|
|
|
if (gbitmap->converted) {
|
|
cairo_surface_mark_dirty(gbitmap->surface);
|
|
return;
|
|
}
|
|
|
|
if (fmt == CAIRO_FORMAT_RGB24) {
|
|
/* Opaque image */
|
|
for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
|
|
/* Core bitmaps always have a component order of rgba,
|
|
* regardless of system endianness */
|
|
r = pixels[4 * pixel_loop + 0];
|
|
g = pixels[4 * pixel_loop + 1];
|
|
b = pixels[4 * pixel_loop + 2];
|
|
t = pixels[4 * pixel_loop + 3];
|
|
|
|
/* Cairo surface is ARGB, written in native endian */
|
|
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
|
|
pixels[4 * pixel_loop + 0] = b;
|
|
pixels[4 * pixel_loop + 1] = g;
|
|
pixels[4 * pixel_loop + 2] = r;
|
|
pixels[4 * pixel_loop + 3] = t;
|
|
#else
|
|
pixels[4 * pixel_loop + 0] = t;
|
|
pixels[4 * pixel_loop + 1] = r;
|
|
pixels[4 * pixel_loop + 2] = g;
|
|
pixels[4 * pixel_loop + 3] = b;
|
|
#endif
|
|
}
|
|
} else {
|
|
/* Alpha image: pre-multiply alpha */
|
|
for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
|
|
r = pixels[4 * pixel_loop + 0];
|
|
g = pixels[4 * pixel_loop + 1];
|
|
b = pixels[4 * pixel_loop + 2];
|
|
t = pixels[4 * pixel_loop + 3];
|
|
|
|
if (t != 0) {
|
|
r = ((r * (t + 1)) >> 8) & 0xff;
|
|
g = ((g * (t + 1)) >> 8) & 0xff;
|
|
b = ((b * (t + 1)) >> 8) & 0xff;
|
|
} else {
|
|
r = g = b = 0;
|
|
}
|
|
|
|
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
|
|
pixels[4 * pixel_loop + 0] = b;
|
|
pixels[4 * pixel_loop + 1] = g;
|
|
pixels[4 * pixel_loop + 2] = r;
|
|
pixels[4 * pixel_loop + 3] = t;
|
|
#else
|
|
pixels[4 * pixel_loop + 0] = t;
|
|
pixels[4 * pixel_loop + 1] = r;
|
|
pixels[4 * pixel_loop + 2] = g;
|
|
pixels[4 * pixel_loop + 3] = b;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
cairo_surface_mark_dirty(gbitmap->surface);
|
|
|
|
gbitmap->converted = true;
|
|
}
|
|
|
|
/* exported interface documented in gtk/bitmap.h */
|
|
int nsgtk_bitmap_get_width(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
return cairo_image_surface_get_width(gbitmap->surface);
|
|
}
|
|
|
|
/* exported interface documented in gtk/bitmap.h */
|
|
int nsgtk_bitmap_get_height(void *vbitmap)
|
|
{
|
|
struct bitmap *gbitmap = (struct bitmap *)vbitmap;
|
|
assert(gbitmap);
|
|
|
|
return cairo_image_surface_get_height(gbitmap->surface);
|
|
}
|
|
|
|
/**
|
|
* Render content into a bitmap.
|
|
*
|
|
* \param bitmap The bitmap to draw to
|
|
* \param content The content to render
|
|
* \return true on success and bitmap updated else false
|
|
*/
|
|
static nserror
|
|
bitmap_render(struct bitmap *bitmap, struct hlcache_handle *content)
|
|
{
|
|
cairo_surface_t *dsurface = bitmap->surface;
|
|
cairo_surface_t *surface;
|
|
cairo_t *old_cr;
|
|
gint dwidth, dheight;
|
|
int cwidth, cheight;
|
|
struct redraw_context ctx = {
|
|
.interactive = false,
|
|
.background_images = true,
|
|
.plot = &nsgtk_plotters
|
|
};
|
|
|
|
assert(content);
|
|
assert(bitmap);
|
|
|
|
dwidth = cairo_image_surface_get_width(dsurface);
|
|
dheight = cairo_image_surface_get_height(dsurface);
|
|
|
|
/* Calculate size of buffer to render the content into */
|
|
/* Get the width from the content width, unless it exceeds 1024,
|
|
* in which case we use 1024. This means we never create excessively
|
|
* large render buffers for huge contents, which would eat memory and
|
|
* cripple performance.
|
|
*/
|
|
cwidth = min(max(content_get_width(content), dwidth), 1024);
|
|
|
|
/* The height is set in proportion with the width, according to the
|
|
* aspect ratio of the required thumbnail. */
|
|
cheight = ((cwidth * dheight) + (dwidth / 2)) / dwidth;
|
|
|
|
/* Create surface to render into */
|
|
surface = cairo_surface_create_similar(dsurface, CAIRO_CONTENT_COLOR_ALPHA, cwidth, cheight);
|
|
|
|
if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
|
|
cairo_surface_destroy(surface);
|
|
return false;
|
|
}
|
|
|
|
old_cr = current_cr;
|
|
current_cr = cairo_create(surface);
|
|
|
|
/* render the content */
|
|
content_scaled_redraw(content, cwidth, cheight, &ctx);
|
|
|
|
cairo_destroy(current_cr);
|
|
current_cr = old_cr;
|
|
|
|
cairo_t *cr = cairo_create(dsurface);
|
|
|
|
/* Scale *before* setting the source surface (1) */
|
|
cairo_scale (cr, (double)dwidth / cwidth, (double)dheight / cheight);
|
|
cairo_set_source_surface (cr, surface, 0, 0);
|
|
|
|
/* To avoid getting the edge pixels blended with 0 alpha,
|
|
* which would occur with the default EXTEND_NONE. Use
|
|
* EXTEND_PAD for 1.2 or newer (2)
|
|
*/
|
|
cairo_pattern_set_extend(cairo_get_source(cr), CAIRO_EXTEND_REFLECT);
|
|
|
|
/* Replace the destination with the source instead of overlaying */
|
|
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
|
|
|
|
/* Do the actual drawing */
|
|
cairo_paint(cr);
|
|
|
|
cairo_destroy(cr);
|
|
|
|
cairo_surface_destroy(surface);
|
|
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
|
|
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 = nsgtk_bitmap_get_width,
|
|
.get_height = nsgtk_bitmap_get_height,
|
|
.get_bpp = bitmap_get_bpp,
|
|
.save = bitmap_save,
|
|
.modified = bitmap_modified,
|
|
.render = bitmap_render,
|
|
};
|
|
|
|
struct gui_bitmap_table *nsgtk_bitmap_table = &bitmap_table;
|