mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-03 11:21:55 +03:00
440 lines
11 KiB
C
440 lines
11 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Generic bitmap handling (GDK / GTK+ implementation).
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*
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* This implements the interface given by desktop/bitmap.h using GdkPixbufs.
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include <string.h>
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#include <cairo.h>
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#include <gtk/gtk.h>
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#include "content/content.h"
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#include "gtk/scaffolding.h"
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#include "gtk/bitmap.h"
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#include "image/bitmap.h"
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#include "utils/log.h"
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/**
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* Create a bitmap.
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*
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* \param width width of image in pixels
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* \param height width of image in pixels
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* \param state a flag word indicating the initial state
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* \return an opaque struct bitmap, or NULL on memory exhaustion
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*/
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void *bitmap_create(int width, int height, unsigned int state)
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{
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struct bitmap *gbitmap;
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gbitmap = calloc(1, sizeof(struct bitmap));
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if (gbitmap != NULL) {
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if ((state & BITMAP_OPAQUE) != 0) {
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gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
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} else {
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gbitmap->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
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}
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if (cairo_surface_status(gbitmap->surface) != CAIRO_STATUS_SUCCESS) {
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cairo_surface_destroy(gbitmap->surface);
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free(gbitmap);
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gbitmap = NULL;
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}
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}
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return gbitmap;
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}
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/**
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* Sets whether a bitmap should be plotted opaque
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \param opaque whether the bitmap should be plotted opaque
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*/
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void bitmap_set_opaque(void *vbitmap, bool opaque)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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cairo_format_t fmt;
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cairo_surface_t *nsurface = NULL;
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assert(gbitmap);
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fmt = cairo_image_surface_get_format(gbitmap->surface);
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if (fmt == CAIRO_FORMAT_RGB24) {
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if (opaque == false) {
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/* opaque to transparent */
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nsurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
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cairo_image_surface_get_width(gbitmap->surface),
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cairo_image_surface_get_height(gbitmap->surface));
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}
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} else {
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if (opaque == true) {
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/* transparent to opaque */
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nsurface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
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cairo_image_surface_get_width(gbitmap->surface),
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cairo_image_surface_get_height(gbitmap->surface));
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}
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}
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if (nsurface != NULL) {
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if (cairo_surface_status(nsurface) != CAIRO_STATUS_SUCCESS) {
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cairo_surface_destroy(nsurface);
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} else {
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memcpy(cairo_image_surface_get_data(nsurface),
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cairo_image_surface_get_data(gbitmap->surface),
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cairo_image_surface_get_stride(gbitmap->surface) * cairo_image_surface_get_height(gbitmap->surface));
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cairo_surface_destroy(gbitmap->surface);
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gbitmap->surface = nsurface;
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cairo_surface_mark_dirty(gbitmap->surface);
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}
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}
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}
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/**
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* Tests whether a bitmap has an opaque alpha channel
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \return whether the bitmap is opaque
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*/
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bool bitmap_test_opaque(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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unsigned char *pixels;
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int pcount;
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int ploop;
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assert(gbitmap);
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pixels = cairo_image_surface_get_data(gbitmap->surface);
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pcount = cairo_image_surface_get_stride(gbitmap->surface) *
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cairo_image_surface_get_height(gbitmap->surface);
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for (ploop = 3; ploop < pcount; ploop += 4) {
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if (pixels[ploop] != 0xff) {
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return false;
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}
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}
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return true;
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}
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/**
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* Gets whether a bitmap should be plotted opaque
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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*/
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bool bitmap_get_opaque(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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cairo_format_t fmt;
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assert(gbitmap);
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fmt = cairo_image_surface_get_format(gbitmap->surface);
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if (fmt == CAIRO_FORMAT_RGB24) {
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return true;
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}
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return false;
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}
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/**
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* Return a pointer to the pixel data in a bitmap.
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \return pointer to the pixel buffer
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*
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* The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end
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* of rows. The width of a row in bytes is given by bitmap_get_rowstride().
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*/
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unsigned char *bitmap_get_buffer(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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int pixel_loop;
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int pixel_count;
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uint8_t *pixels;
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uint32_t t, r, g, b;
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cairo_format_t fmt;
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assert(gbitmap);
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cairo_surface_flush(gbitmap->surface);
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pixels = cairo_image_surface_get_data(gbitmap->surface);
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if (!gbitmap->converted)
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return pixels;
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fmt = cairo_image_surface_get_format(gbitmap->surface);
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pixel_count = cairo_image_surface_get_width(gbitmap->surface) *
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cairo_image_surface_get_height(gbitmap->surface);
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if (fmt == CAIRO_FORMAT_RGB24) {
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/* Opaque image */
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for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
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/* Cairo surface is ARGB, written in native endian */
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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b = pixels[4 * pixel_loop + 0];
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g = pixels[4 * pixel_loop + 1];
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r = pixels[4 * pixel_loop + 2];
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t = pixels[4 * pixel_loop + 3];
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#else
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t = pixels[4 * pixel_loop + 0];
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r = pixels[4 * pixel_loop + 1];
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g = pixels[4 * pixel_loop + 2];
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b = pixels[4 * pixel_loop + 3];
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#endif
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/* Core bitmaps always have a component order of rgba,
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* regardless of system endianness */
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pixels[4 * pixel_loop + 0] = r;
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pixels[4 * pixel_loop + 1] = g;
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pixels[4 * pixel_loop + 2] = b;
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pixels[4 * pixel_loop + 3] = t;
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}
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} else {
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/* Alpha image: de-multiply alpha */
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for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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b = pixels[4 * pixel_loop + 0];
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g = pixels[4 * pixel_loop + 1];
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r = pixels[4 * pixel_loop + 2];
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t = pixels[4 * pixel_loop + 3];
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#else
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t = pixels[4 * pixel_loop + 0];
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r = pixels[4 * pixel_loop + 1];
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g = pixels[4 * pixel_loop + 2];
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b = pixels[4 * pixel_loop + 3];
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#endif
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if (t != 0) {
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r = (r << 8) / t;
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g = (g << 8) / t;
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b = (b << 8) / t;
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r = (r > 255) ? 255 : r;
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g = (g > 255) ? 255 : g;
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b = (b > 255) ? 255 : b;
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} else {
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r = g = b = 0;
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}
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pixels[4 * pixel_loop + 0] = r;
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pixels[4 * pixel_loop + 1] = g;
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pixels[4 * pixel_loop + 2] = b;
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pixels[4 * pixel_loop + 3] = t;
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}
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}
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gbitmap->converted = false;
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return (unsigned char *) pixels;
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}
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/**
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* Find the width of a pixel row in bytes.
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \return width of a pixel row in the bitmap
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*/
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size_t bitmap_get_rowstride(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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return cairo_image_surface_get_stride(gbitmap->surface);
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}
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/**
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* Find the bytes per pixel of a bitmap
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \return bytes per pixel
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*/
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size_t bitmap_get_bpp(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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return 4;
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}
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/**
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* Free a bitmap.
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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*/
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void bitmap_destroy(void *vbitmap)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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if (gbitmap->surface != NULL) {
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cairo_surface_destroy(gbitmap->surface);
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}
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if (gbitmap->scsurface != NULL) {
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cairo_surface_destroy(gbitmap->scsurface);
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}
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free(gbitmap);
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}
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/**
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* Save a bitmap in the platform's native format.
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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* \param path pathname for file
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* \param flags modify the behaviour of the save
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* \return true on success, false on error and error reported
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*/
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bool bitmap_save(void *vbitmap, const char *path, unsigned flags)
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{
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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return false;
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}
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/**
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* The bitmap image has changed, so flush any persistant cache.
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*
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* \param vbitmap a bitmap, as returned by bitmap_create()
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*/
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void bitmap_modified(void *vbitmap) {
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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int pixel_loop;
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int pixel_count;
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uint8_t *pixels;
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uint32_t t, r, g, b;
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cairo_format_t fmt;
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assert(gbitmap);
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fmt = cairo_image_surface_get_format(gbitmap->surface);
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pixel_count = cairo_image_surface_get_width(gbitmap->surface) *
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cairo_image_surface_get_height(gbitmap->surface);
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pixels = cairo_image_surface_get_data(gbitmap->surface);
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if (gbitmap->converted) {
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cairo_surface_mark_dirty(gbitmap->surface);
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return;
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}
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if (fmt == CAIRO_FORMAT_RGB24) {
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/* Opaque image */
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for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
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/* Core bitmaps always have a component order of rgba,
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* regardless of system endianness */
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r = pixels[4 * pixel_loop + 0];
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g = pixels[4 * pixel_loop + 1];
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b = pixels[4 * pixel_loop + 2];
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t = pixels[4 * pixel_loop + 3];
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/* Cairo surface is ARGB, written in native endian */
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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pixels[4 * pixel_loop + 0] = b;
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pixels[4 * pixel_loop + 1] = g;
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pixels[4 * pixel_loop + 2] = r;
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pixels[4 * pixel_loop + 3] = t;
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#else
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pixels[4 * pixel_loop + 0] = t;
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pixels[4 * pixel_loop + 1] = r;
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pixels[4 * pixel_loop + 2] = g;
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pixels[4 * pixel_loop + 3] = b;
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#endif
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}
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} else {
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/* Alpha image: pre-multiply alpha */
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for (pixel_loop=0; pixel_loop < pixel_count; pixel_loop++) {
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r = pixels[4 * pixel_loop + 0];
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g = pixels[4 * pixel_loop + 1];
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b = pixels[4 * pixel_loop + 2];
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t = pixels[4 * pixel_loop + 3];
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if (t != 0) {
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r = ((r * (t + 1)) >> 8) & 0xff;
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g = ((g * (t + 1)) >> 8) & 0xff;
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b = ((b * (t + 1)) >> 8) & 0xff;
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} else {
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r = g = b = 0;
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}
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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pixels[4 * pixel_loop + 0] = b;
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pixels[4 * pixel_loop + 1] = g;
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pixels[4 * pixel_loop + 2] = r;
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pixels[4 * pixel_loop + 3] = t;
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#else
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pixels[4 * pixel_loop + 0] = t;
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pixels[4 * pixel_loop + 1] = r;
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pixels[4 * pixel_loop + 2] = g;
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pixels[4 * pixel_loop + 3] = b;
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#endif
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}
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}
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cairo_surface_mark_dirty(gbitmap->surface);
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gbitmap->converted = true;
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}
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int bitmap_get_width(void *vbitmap){
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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return cairo_image_surface_get_width(gbitmap->surface);
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}
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int bitmap_get_height(void *vbitmap){
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struct bitmap *gbitmap = (struct bitmap *)vbitmap;
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assert(gbitmap);
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return cairo_image_surface_get_height(gbitmap->surface);
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}
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