mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-24 23:39:51 +03:00
3d9a1198db
Reduce constant bitmap overhead per reference by moving to a flag word. Allow bitmaps to be reduced back to their raw data to free extra memory in a highly efficient manner. svn path=/import/netsurf/; revision=2089
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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*/
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/** \file
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* Generic bitmap handling (dummy debug implementation).
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*
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* This implements the interface given by desktop/bitmap.h using a simple
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* buffer.
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include "netsurf/image/bitmap.h"
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struct bitmap {
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int width;
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char pixels[1];
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};
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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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struct bitmap *bitmap_create(int width, int height, unsigned int state)
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{
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struct bitmap *bitmap;
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bitmap = calloc(sizeof *bitmap + width * height * 4, 1);
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if (bitmap)
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bitmap->width = width;
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return bitmap;
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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 bitmap 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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char *bitmap_get_buffer(struct bitmap *bitmap)
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{
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assert(bitmap);
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return bitmap->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 bitmap 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(struct bitmap *bitmap)
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{
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assert(bitmap);
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return bitmap->width * 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 bitmap a bitmap, as returned by bitmap_create()
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*/
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void bitmap_destroy(struct bitmap *bitmap)
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{
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assert(bitmap);
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free(bitmap);
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}
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/**
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* Render a bitmap.
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*/
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bool bitmap_redraw(struct content *c, int x, int y,
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int width, int height,
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int clip_x0, int clip_y0, int clip_x1, int clip_y1,
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float scale, unsigned long background_colour)
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{
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return true;
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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 bitmap a bitmap, as returned by bitmap_create()
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* \param path pathname for file
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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(struct bitmap *bitmap, const char *path)
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{
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return true;
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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 bitmap a bitmap, as returned by bitmap_create()
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*/
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void bitmap_modified(struct bitmap *bitmap) {
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}
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/**
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* The bitmap image can be suspended.
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*
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* \param bitmap a bitmap, as returned by bitmap_create()
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* \param private_word a private word to be returned later
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* \param suspend the function to be called upon suspension
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* \param resume the function to be called when resuming
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*/
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void bitmap_set_suspendable(struct bitmap *bitmap, void *private_word,
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void (*invalidate)(struct bitmap *bitmap, void *private_word)) {
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}
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