gecko/gfx/thebes/src/gfxImageSurface.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Oracle Corporation code.
*
* The Initial Developer of the Original Code is Oracle Corporation.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@pavlov.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "prmem.h"
#include "gfxImageSurface.h"
#include "cairo.h"
gfxImageSurface::gfxImageSurface(unsigned char *aData, const gfxIntSize& aSize,
long aStride, gfxImageFormat aFormat)
: mSize(aSize)
, mOwnsData(PR_FALSE)
, mData(aData)
, mFormat(aFormat)
, mStride(aStride)
{
if (!CheckSurfaceSize(aSize))
return;
cairo_surface_t *surface =
cairo_image_surface_create_for_data((unsigned char*)mData,
(cairo_format_t)mFormat,
mSize.width,
mSize.height,
mStride);
// cairo_image_surface_create_for_data can return a 'null' surface
// in out of memory conditions. The gfxASurface::Init call checks
// the surface it receives to see if there is an error with the
// surface and handles it appropriately. That is why there is
// no check here.
Init(surface);
}
gfxImageSurface::gfxImageSurface(const gfxIntSize& size, gfxImageFormat format) :
mSize(size), mOwnsData(PR_FALSE), mFormat(format)
{
mStride = ComputeStride();
if (!CheckSurfaceSize(size))
return;
// if we have a zero-sized surface, just set mData to nsnull
if (mSize.height * mStride > 0) {
mData = (unsigned char *) calloc(mSize.height, mStride);
if (!mData)
return;
} else {
mData = nsnull;
}
mOwnsData = PR_TRUE;
cairo_surface_t *surface =
cairo_image_surface_create_for_data((unsigned char*)mData,
(cairo_format_t)format,
mSize.width,
mSize.height,
mStride);
Init(surface);
}
gfxImageSurface::gfxImageSurface(cairo_surface_t *csurf)
{
mSize.width = cairo_image_surface_get_width(csurf);
mSize.height = cairo_image_surface_get_height(csurf);
mData = cairo_image_surface_get_data(csurf);
mFormat = (gfxImageFormat) cairo_image_surface_get_format(csurf);
mOwnsData = PR_FALSE;
mStride = cairo_image_surface_get_stride(csurf);
Init(csurf, PR_TRUE);
}
gfxImageSurface::~gfxImageSurface()
{
if (mOwnsData)
free(mData);
}
long
gfxImageSurface::ComputeStride() const
{
long stride;
if (mFormat == ImageFormatARGB32)
stride = mSize.width * 4;
else if (mFormat == ImageFormatRGB24)
stride = mSize.width * 4;
else if (mFormat == ImageFormatA8)
stride = mSize.width;
else if (mFormat == ImageFormatA1) {
stride = (mSize.width + 7) / 8;
} else {
NS_WARNING("Unknown format specified to gfxImageSurface!");
stride = mSize.width * 4;
}
stride = ((stride + 3) / 4) * 4;
return stride;
}
PRBool
gfxImageSurface::CopyFrom(gfxImageSurface *other)
{
if (other->mSize != mSize)
{
return PR_FALSE;
}
if (other->mFormat != mFormat &&
!(other->mFormat == ImageFormatARGB32 && mFormat == ImageFormatRGB24) &&
!(other->mFormat == ImageFormatRGB24 && mFormat == ImageFormatARGB32))
{
return PR_FALSE;
}
if (other->mStride == mStride) {
memcpy (mData, other->mData, mStride * mSize.height);
} else {
int lineSize = PR_MIN(other->mStride, mStride);
for (int i = 0; i < mSize.height; i++) {
unsigned char *src = other->mData + other->mStride * i;
unsigned char *dst = mData + mStride * i;
memcpy (dst, src, lineSize);
}
}
return PR_TRUE;
}