netsurf/frontends/windows/bitmap.c

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/*
* Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
* Copyright 2009 Mark Benjamin <netsurf-browser.org.MarkBenjamin@dfgh.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
* win32 implementation of the bitmap operations.
*/
#include "utils/config.h"
#include <inttypes.h>
#include <sys/types.h>
#include <string.h>
#include <windows.h>
#include "utils/log.h"
#include "netsurf/bitmap.h"
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#include "netsurf/plotters.h"
#include "netsurf/content.h"
#include "windows/plot.h"
#include "windows/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
*/
void *win32_bitmap_create(int width, int height, unsigned int state)
{
struct bitmap *bitmap;
BITMAPV5HEADER *pbmi;
HBITMAP windib;
uint8_t *pixdata;
NSLOG(netsurf, INFO, "width %d, height %d, state %u", width, height,
state);
pbmi = calloc(1, sizeof(BITMAPV5HEADER));
if (pbmi == NULL) {
return NULL;
}
pbmi->bV5Size = sizeof(BITMAPV5HEADER);
pbmi->bV5Width = width;
pbmi->bV5Height = -height;
pbmi->bV5Planes = 1;
pbmi->bV5BitCount = 32;
pbmi->bV5Compression = BI_BITFIELDS;
pbmi->bV5RedMask = 0xff; /* red mask */
pbmi->bV5GreenMask = 0xff00; /* green mask */
pbmi->bV5BlueMask = 0xff0000; /* blue mask */
pbmi->bV5AlphaMask = 0xff000000; /* alpha mask */
windib = CreateDIBSection(NULL, (BITMAPINFO *)pbmi, DIB_RGB_COLORS, (void **)&pixdata, NULL, 0);
if (windib == NULL) {
free(pbmi);
return NULL;
}
bitmap = calloc(1 , sizeof(struct bitmap));
if (bitmap == NULL) {
DeleteObject(windib);
free(pbmi);
return NULL;
}
bitmap->width = width;
bitmap->height = height;
bitmap->windib = windib;
bitmap->pbmi = pbmi;
bitmap->pixdata = pixdata;
if ((state & BITMAP_OPAQUE) != 0) {
bitmap->opaque = true;
} else {
bitmap->opaque = false;
}
NSLOG(netsurf, INFO, "bitmap %p", bitmap);
return bitmap;
}
/**
* Return a pointer to the pixel data in a bitmap.
*
* 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().
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return pointer to the pixel buffer
*/
static unsigned char *bitmap_get_buffer(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return NULL;
}
return bm->pixdata;
}
/**
* Find the width of a pixel row in bytes.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return width of a pixel row in the bitmap
*/
static size_t bitmap_get_rowstride(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return 0;
}
return (bm->width) * 4;
}
/**
* Free a bitmap.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void win32_bitmap_destroy(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return;
}
DeleteObject(bm->windib);
free(bm->pbmi);
free(bm);
}
/**
* Save a bitmap in the platform's native format.
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \param path pathname for file
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* \param flags flags controlling how the bitmap is saved.
* \return true on success, false on error and error reported
*/
static bool bitmap_save(void *bitmap, const char *path, unsigned flags)
{
return true;
}
/**
* The bitmap image has changed, so flush any persistant cache.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
static void bitmap_modified(void *bitmap) {
}
/**
* Sets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \param opaque whether the bitmap should be plotted opaque
*/
static void bitmap_set_opaque(void *bitmap, bool opaque)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return;
}
NSLOG(netsurf, INFO, "setting bitmap %p to %s", bm,
opaque ? "opaque" : "transparent");
bm->opaque = opaque;
}
/**
* Tests whether a bitmap has an opaque alpha channel
*
* \param bitmap a bitmap, as returned by bitmap_create()
* \return whether the bitmap is opaque
*/
static bool bitmap_test_opaque(void *bitmap)
{
int tst;
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return false;
}
tst = bm->width * bm->height;
while (tst-- > 0) {
if (bm->pixdata[(tst << 2) + 3] != 0xff) {
NSLOG(netsurf, INFO, "bitmap %p has transparency", bm);
return false;
}
}
NSLOG(netsurf, INFO, "bitmap %p is opaque", bm);
return true;
}
/**
* Gets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
static bool bitmap_get_opaque(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return false;
}
return bm->opaque;
}
static int bitmap_get_width(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return 0;
}
return(bm->width);
}
static int bitmap_get_height(void *bitmap)
{
struct bitmap *bm = bitmap;
if (bitmap == NULL) {
NSLOG(netsurf, INFO, "NULL bitmap!");
return 0;
}
return(bm->height);
}
static size_t bitmap_get_bpp(void *bitmap)
{
return 4;
}
struct bitmap *bitmap_scale(struct bitmap *prescale, int width, int height)
{
struct bitmap *ret = malloc(sizeof(struct bitmap));
int i, ii, v, vv;
uint32_t *retpixdata, *inpixdata; /* 4 byte types for quicker
* transfer */
if (ret == NULL)
return NULL;
retpixdata = malloc(width * height * 4);
if (retpixdata == NULL) {
free(ret);
return NULL;
}
inpixdata = (uint32_t *)prescale->pixdata;
ret->pixdata = (uint8_t *)retpixdata;
ret->height = height;
ret->width = width;
for (i = 0; i < height; i++) {
v = i * width;
vv = (int)((i * prescale->height) / height) * prescale->width;
for (ii = 0; ii < width; ii++) {
retpixdata[v + ii] = inpixdata[vv + (int)
((ii * prescale->width) / width)];
}
}
return ret;
}
static nserror
bitmap_render(struct bitmap *bitmap, struct hlcache_handle *content)
{
int width;
int height;
HDC hdc, bufferdc, minidc;
struct bitmap *fsbitmap;
struct redraw_context ctx = {
.interactive = false,
.background_images = true,
.plot = &win_plotters
};
width = min(max(content_get_width(content), bitmap->width), 1024);
height = ((width * bitmap->height) + (bitmap->width / 2)) /
bitmap->width;
NSLOG(netsurf, INFO, "bitmap %p for content %p width %d, height %d",
bitmap, content, width, height);
/* create two memory device contexts to put the bitmaps in */
bufferdc = CreateCompatibleDC(NULL);
if ((bufferdc == NULL)) {
return NSERROR_NOMEM;
}
minidc = CreateCompatibleDC(NULL);
if ((minidc == NULL)) {
DeleteDC(bufferdc);
return NSERROR_NOMEM;
}
/* create a full size bitmap and plot into it */
fsbitmap = win32_bitmap_create(width, height, BITMAP_NEW | BITMAP_CLEAR_MEMORY | BITMAP_OPAQUE);
SelectObject(bufferdc, fsbitmap->windib);
hdc = plot_hdc;
plot_hdc = bufferdc;
/* render the content */
content_scaled_redraw(content, width, height, &ctx);
plot_hdc = hdc;
/* scale bitmap bufferbm into minibm */
SelectObject(minidc, bitmap->windib);
bitmap->opaque = true;
StretchBlt(minidc, 0, 0, bitmap->width, bitmap->height, bufferdc, 0, 0, width, height, SRCCOPY);
DeleteDC(bufferdc);
DeleteDC(minidc);
win32_bitmap_destroy(fsbitmap);
return NSERROR_OK;
}
static struct gui_bitmap_table bitmap_table = {
.create = win32_bitmap_create,
.destroy = win32_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 = bitmap_get_width,
.get_height = bitmap_get_height,
.get_bpp = bitmap_get_bpp,
.save = bitmap_save,
.modified = bitmap_modified,
.render = bitmap_render,
};
struct gui_bitmap_table *win32_bitmap_table = &bitmap_table;