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-rw-r--r--gtk/bitmap.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/gtk/bitmap.c b/gtk/bitmap.c
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+++ b/gtk/bitmap.c
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+/*
+ * 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 <gdk/gdk.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "content/content.h"
+#include "gtk/bitmap.h"
+#include "gtk/scaffolding.h"
+#include "image/bitmap.h"
+#include "utils/log.h"
+
+
+struct bitmap {
+ GdkPixbuf *primary;
+ GdkPixbuf *pretile_x;
+ GdkPixbuf *pretile_y;
+ GdkPixbuf *pretile_xy;
+ bool opaque;
+};
+
+#define MIN_PRETILE_WIDTH 256
+#define MIN_PRETILE_HEIGHT 256
+
+
+/**
+ * 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 = malloc(sizeof(struct bitmap));
+
+ bmp->primary = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true,
+ 8, width, height);
+
+ /* fill the pixbuf in with 100% transparent black, as the memory
+ * won't have been cleared.
+ */
+ gdk_pixbuf_fill(bmp->primary, 0);
+ 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 *)gdk_pixbuf_get_pixels(bitmap->primary);
+}
+
+
+/**
+ * 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 gdk_pixbuf_get_rowstride(bitmap->primary);
+}
+
+
+/**
+ * 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;
+}
+
+
+static void
+gtk_bitmap_free_pretiles(struct bitmap *bitmap)
+{
+#define FREE_TILE(XY) if (bitmap->pretile_##XY) g_object_unref(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);
+ gtk_bitmap_free_pretiles(bitmap);
+ g_object_unref(bitmap->primary);
+ 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;
+ GError *err = NULL;
+
+ gdk_pixbuf_save(bitmap->primary, path, "png", &err, NULL);
+
+ if (err == NULL)
+ /* TODO: report an error here */
+ return false;
+
+ 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 *vbitmap) {
+ struct bitmap *bitmap = (struct bitmap *)vbitmap;
+ gtk_bitmap_free_pretiles(bitmap);
+}
+
+
+/**
+ * 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 invalidate the function to be called upon suspension
+ */
+void bitmap_set_suspendable(void *vbitmap, void *private_word,
+ void (*invalidate)(void *vbitmap, void *private_word)) {
+}
+
+int bitmap_get_width(void *vbitmap){
+ struct bitmap *bitmap = (struct bitmap *)vbitmap;
+ return gdk_pixbuf_get_width(bitmap->primary);
+}
+
+int bitmap_get_height(void *vbitmap){
+ struct bitmap *bitmap = (struct bitmap *)vbitmap;
+ return gdk_pixbuf_get_height(bitmap->primary);
+}
+
+static GdkPixbuf *
+gtk_bitmap_generate_pretile(GdkPixbuf *primary, int repeat_x, int repeat_y)
+{
+ int width = gdk_pixbuf_get_width(primary);
+ int height = gdk_pixbuf_get_height(primary);
+ size_t primary_stride = gdk_pixbuf_get_rowstride(primary);
+ GdkPixbuf *result = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8,
+ width * repeat_x, height * repeat_y);
+ char *target_buffer = (char *)gdk_pixbuf_get_pixels(result);
+ int x,y,row;
+ /* This algorithm won't work if the strides are not multiples */
+ assert((size_t)gdk_pixbuf_get_rowstride(result) ==
+ (primary_stride * repeat_x));
+
+ if (repeat_x == 1 && repeat_y == 1) {
+ g_object_ref(primary);
+ g_object_unref(result);
+ return primary;
+ }
+
+ for (y = 0; y < repeat_y; ++y) {
+ char *primary_buffer = (char *)gdk_pixbuf_get_pixels(primary);
+ 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()
+ */
+GdkPixbuf *
+gtk_bitmap_get_primary(struct bitmap *bitmap)
+{
+ if (bitmap != NULL)
+ return bitmap->primary;
+ else
+ return NULL;
+}
+
+/**
+ * The X-pretiled image associated with this bitmap object.
+ *
+ * \param bitmap a bitmap, as returned by bitmap_create()
+ */
+GdkPixbuf *
+gtk_bitmap_get_pretile_x(struct bitmap* bitmap)
+{
+ if (!bitmap->pretile_x) {
+ int width = gdk_pixbuf_get_width(bitmap->primary);
+ int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
+ LOG(("Pretiling %p for X*%d", bitmap, xmult));
+ bitmap->pretile_x = gtk_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()
+ */
+GdkPixbuf *
+gtk_bitmap_get_pretile_y(struct bitmap* bitmap)
+{
+ if (!bitmap->pretile_y) {
+ int height = gdk_pixbuf_get_height(bitmap->primary);
+ int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
+ LOG(("Pretiling %p for Y*%d", bitmap, ymult));
+ bitmap->pretile_y = gtk_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()
+ */
+GdkPixbuf *
+gtk_bitmap_get_pretile_xy(struct bitmap* bitmap)
+{
+ if (!bitmap->pretile_xy) {
+ int width = gdk_pixbuf_get_width(bitmap->primary);
+ int height = gdk_pixbuf_get_height(bitmap->primary);
+ 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 = gtk_bitmap_generate_pretile(bitmap->primary, xmult, ymult);
+ }
+ return bitmap->pretile_xy;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-24 21:25:40 +0000