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Diffstat (limited to 'gtk/bitmap.c')
-rw-r--r-- | gtk/bitmap.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/gtk/bitmap.c b/gtk/bitmap.c new file mode 100644 index 000000000..5dafb129e --- /dev/null +++ b/gtk/bitmap.c @@ -0,0 +1,348 @@ +/* + * 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; +} |