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/* $Id: DisplayPNGUtil.cpp $ */
/** @file
* PNG utilities
*/
/*
* Copyright (C) 2010-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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, in version 3 of the
* License.
*
* This program 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 <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOG_GROUP LOG_GROUP_MAIN_DISPLAY
#include "DisplayImpl.h"
#include <iprt/alloc.h>
#include <png.h>
#define kMaxSizePNG 1024
typedef struct PNGWriteCtx
{
uint8_t *pu8PNG;
uint32_t cbPNG;
uint32_t cbAllocated;
int vrc;
} PNGWriteCtx;
static void PNGAPI png_write_data_fn(png_structp png_ptr, png_bytep p, png_size_t cb) RT_NOTHROW_DEF
{
PNGWriteCtx *pCtx = (PNGWriteCtx *)png_get_io_ptr(png_ptr);
LogFlowFunc(("png_ptr %p, p %p, cb %d, pCtx %p\n", png_ptr, p, cb, pCtx));
if (pCtx && RT_SUCCESS(pCtx->vrc))
{
if (pCtx->cbAllocated - pCtx->cbPNG < cb)
{
uint32_t cbNew = pCtx->cbPNG + (uint32_t)cb;
AssertReturnVoidStmt(cbNew > pCtx->cbPNG && cbNew <= _1G, pCtx->vrc = VERR_TOO_MUCH_DATA);
cbNew = RT_ALIGN_32(cbNew, 4096) + 4096;
void *pNew = RTMemRealloc(pCtx->pu8PNG, cbNew);
if (!pNew)
{
pCtx->vrc = VERR_NO_MEMORY;
return;
}
pCtx->pu8PNG = (uint8_t *)pNew;
pCtx->cbAllocated = cbNew;
}
memcpy(pCtx->pu8PNG + pCtx->cbPNG, p, cb);
pCtx->cbPNG += (uint32_t)cb;
}
}
static void PNGAPI png_output_flush_fn(png_structp png_ptr) RT_NOTHROW_DEF
{
NOREF(png_ptr);
/* Do nothing. */
}
int DisplayMakePNG(uint8_t *pu8Data, uint32_t cx, uint32_t cy,
uint8_t **ppu8PNG, uint32_t *pcbPNG, uint32_t *pcxPNG, uint32_t *pcyPNG,
uint8_t fLimitSize)
{
int vrc = VINF_SUCCESS;
uint8_t * volatile pu8Bitmap = NULL; /* gcc setjmp warning */
uint32_t volatile cbBitmap = 0; /* gcc setjmp warning */
uint32_t volatile cxBitmap = 0; /* gcc setjmp warning */
uint32_t volatile cyBitmap = 0; /* gcc setjmp warning */
if (!fLimitSize || (cx < kMaxSizePNG && cy < kMaxSizePNG))
{
/* Save unscaled screenshot. */
pu8Bitmap = pu8Data;
cbBitmap = cx * 4 * cy;
cxBitmap = cx;
cyBitmap = cy;
}
else
{
/* Large screenshot, scale. */
if (cx > cy)
{
cxBitmap = kMaxSizePNG;
cyBitmap = (kMaxSizePNG * cy) / cx;
}
else
{
cyBitmap = kMaxSizePNG;
cxBitmap = (kMaxSizePNG * cx) / cy;
}
cbBitmap = cxBitmap * 4 * cyBitmap;
pu8Bitmap = (uint8_t *)RTMemAlloc(cbBitmap);
if (pu8Bitmap)
{
BitmapScale32(pu8Bitmap /*dst*/,
(int)cxBitmap, (int)cyBitmap,
pu8Data /*src*/,
(int)cx * 4,
(int)cx, (int)cy);
}
else
{
vrc = VERR_NO_MEMORY;
}
}
LogFlowFunc(("%dx%d -> %dx%d\n", cx, cy, cxBitmap, cyBitmap));
if (RT_SUCCESS(vrc))
{
png_bytep *row_pointers = (png_bytep *)RTMemAlloc(cyBitmap * sizeof(png_bytep));
if (row_pointers)
{
png_infop info_ptr = NULL;
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
(png_voidp)NULL, /* error/warning context pointer */
(png_error_ptr)NULL, /* error function */
(png_error_ptr)NULL /* warning function */);
if (png_ptr)
{
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr)
{
#if RT_MSC_PREREQ(RT_MSC_VER_VC140)
#pragma warning(push,3)
if (!setjmp(png_jmpbuf(png_ptr)))
#pragma warning(pop)
#else
if (!setjmp(png_jmpbuf(png_ptr)))
#endif
{
PNGWriteCtx ctx;
ctx.pu8PNG = NULL;
ctx.cbPNG = 0;
ctx.cbAllocated = 0;
ctx.vrc = VINF_SUCCESS;
png_set_write_fn(png_ptr,
(png_voidp)&ctx,
png_write_data_fn,
png_output_flush_fn);
png_set_IHDR(png_ptr, info_ptr,
cxBitmap, cyBitmap,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_bytep row_pointer = (png_bytep)pu8Bitmap;
unsigned i = 0;
for (; i < cyBitmap; i++, row_pointer += cxBitmap * 4)
{
row_pointers[i] = row_pointer;
}
png_set_rows(png_ptr, info_ptr, &row_pointers[0]);
png_write_info(png_ptr, info_ptr);
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
png_set_bgr(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_IDAT))
png_write_image(png_ptr, png_get_rows(png_ptr, info_ptr));
png_write_end(png_ptr, info_ptr);
vrc = ctx.vrc;
if (RT_SUCCESS(vrc))
{
*ppu8PNG = ctx.pu8PNG;
*pcbPNG = ctx.cbPNG;
*pcxPNG = cxBitmap;
*pcyPNG = cyBitmap;
LogFlowFunc(("PNG %d bytes, bitmap %d bytes\n", ctx.cbPNG, cbBitmap));
}
}
else
{
vrc = VERR_GENERAL_FAILURE; /* Something within libpng. */
}
}
else
{
vrc = VERR_NO_MEMORY;
}
png_destroy_write_struct(&png_ptr, info_ptr ? &info_ptr
: (png_infopp)NULL);
}
else
{
vrc = VERR_NO_MEMORY;
}
RTMemFree(row_pointers);
}
else
{
vrc = VERR_NO_MEMORY;
}
}
if (pu8Bitmap && pu8Bitmap != pu8Data)
{
RTMemFree(pu8Bitmap);
}
return vrc;
}
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