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buffer.c
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buffer.c
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/*
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
*
* This 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; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* buffer.c - functions to deal with the raw image buffer.
*/
#include "vncsnapshot.h"
#include <assert.h>
#include <err.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdint.h>
#include <jpeglib.h>
#include <stdio.h>
#include <png.h> /* PNG lib */
#include <zlib.h>
static void BufferPixelToRGB(uint32_t pixel, uint16_t *r, uint16_t *g, uint16_t *b);
static uint8_t * rawBuffer = NULL;
static bool bufferBlank = true;
static bool bufferWritten = false;
#define RAW_BYTES_PER_PIXEL 3 /* size of pixel in raw buffer */
#define MY_BYTES_PER_PIXEL 4 /* size of pixel in VNC buffer */
#define MY_BITS_PER_PIXEL (MY_BYTES_PER_PIXEL*8)
int
AllocateBuffer()
{
uint32_t bytes;
static const short testEndian = 1;
/* Determine 'endian' nature of this machine */
/* On big-endian machines, the address of a short (16 bit) is the
* most significant byte (and is therefore 0). On little-endian,
* it is the address of the least significant byte - and is therefore
* 1.
*
* Intel 8x86 (including Pentium) are big-endian. Motorola, PDP-11,
* and Sparc are little-endian.
*/
bool bigEndian = 0 == *(char *)&testEndian;
/* Format is RGBA. Due to the way we store the pixels,
* the 'bigEndian' is the *opposite* of the hardware value.
*/
myFormat.bitsPerPixel = MY_BITS_PER_PIXEL;
myFormat.depth = 24;
myFormat.trueColour = 1;
myFormat.bigEndian = bigEndian;
if (bigEndian) {
myFormat.redShift = 24;
myFormat.greenShift = 16;
myFormat.blueShift = 8;
} else {
myFormat.redShift = 0;
myFormat.greenShift = 8;
myFormat.blueShift = 16;
}
myFormat.redMax = 0xFF;
myFormat.greenMax = 0xFF;
myFormat.blueMax = 0xFF;
assert(SIZE_MAX / (myFormat.depth / 8) / si.framebufferWidth >= si.framebufferHeight);
bytes = (uint32_t) (si.framebufferWidth * si.framebufferHeight * myFormat.depth / 8);
rawBuffer = malloc(bytes); /* allocate initialized to 0 */
if (rawBuffer == NULL) {
fprintf(stderr, "Failed to allocate memory frame buffer, %" PRId32 " bytes\n",
bytes);
return 0;
}
memset(rawBuffer, 0xBA, bytes);
return 1;
}
void
CopyDataToScreen(uint8_t *buffer, uint32_t x, uint32_t y, uint32_t w, uint32_t h)
{
size_t start;
size_t stride;
size_t row, col;
assert(si.framebufferWidth > w);
stride = (size_t)(si.framebufferWidth * RAW_BYTES_PER_PIXEL - (int32_t)w * RAW_BYTES_PER_PIXEL);
start = (x + y * si.framebufferWidth) * RAW_BYTES_PER_PIXEL;
bufferWritten = 1;
for (row = 0; row < h; row++) {
for (col = 0; col < w; col++) {
bufferBlank &= buffer[0] == 0 &&
buffer[1] == 0 &&
buffer[2] == 0;
rawBuffer[start++] = *buffer++;
rawBuffer[start++] = *buffer++;
rawBuffer[start++] = *buffer++;
buffer++; /* ignore 4th byte */
}
start += stride;
}
}
uint8_t *
CopyScreenToData(uint32_t x, uint32_t y, uint32_t w, uint32_t h)
{
size_t start;
size_t stride;
size_t row, col;
uint8_t *buffer;
uint8_t *cp;
assert(si.framebufferWidth > w);
stride = (size_t)(si.framebufferWidth * RAW_BYTES_PER_PIXEL - (int32_t)w * RAW_BYTES_PER_PIXEL);
start = (x + y * si.framebufferWidth) * RAW_BYTES_PER_PIXEL;
assert(SIZE_MAX / w / MY_BYTES_PER_PIXEL >= (size_t) h); /* Overflow check */
/* Allocate a buffer at the VNC size, not the raw size */
buffer = malloc((size_t)(h * w * MY_BYTES_PER_PIXEL));
cp = buffer;
for (row = 0; row < h; row++) {
for (col = 0; col < w; col++) {
*cp++ = rawBuffer[start++];
*cp++ = rawBuffer[start++];
*cp++ = rawBuffer[start++];
*cp++ = 0;
}
start += stride;
}
return buffer;
}
void
FillBufferRectangle(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint32_t pixel)
{
uint16_t r, g, b;
size_t start;
size_t stride;
size_t row, col;
BufferPixelToRGB(pixel, &r, &g, &b);
bufferBlank &= r == 0 && g == 0 && b == 0;
bufferWritten = 1;
stride = (size_t)(si.framebufferWidth * RAW_BYTES_PER_PIXEL - (int32_t)w * RAW_BYTES_PER_PIXEL);
start = (x + y * si.framebufferWidth) * RAW_BYTES_PER_PIXEL;
for (row = 0; row < h; row++) {
for (col = 0; col < w; col++) {
rawBuffer[start++] = (uint8_t) r;
rawBuffer[start++] = (uint8_t) g;
rawBuffer[start++] = (uint8_t) b;
}
start += stride;
}
}
int
BufferIsBlank()
{
return bufferBlank;
}
int
BufferWritten()
{
return bufferWritten;
}
extern void write_PNG(char *filename, int interlace, uint32_t width, uint32_t height)
{
int bit_depth=0, color_type;
png_bytep row_pointers[height];
png_structp png_ptr;
png_infop info_ptr;
for (uint32_t i=0; i<height; i++)
{
//row_pointers[i] = rawBuffer + i * 4 * width; //XXX
row_pointers[i] = & rawBuffer[i * 3 * width];
}
FILE *outfile = fopen(filename, "wb");
if (!outfile) err(1, "couldn't fopen %s", filename);
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
(png_voidp) NULL, (png_error_ptr) NULL, (png_error_ptr) NULL);
if (!png_ptr) errx(1, "couldn't create PNG write struct");
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fprintf(stderr, "Error: Couldn't create PNG info struct.");
exit(1);
}
png_init_io(png_ptr, outfile);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB;
//png_set_invert_alpha(png_ptr);
//png_set_bgr(png_ptr);
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, color_type, interlace,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
printf ("Now writing PNG file\n");
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
/* puh, done, now freeing memory... */
png_destroy_write_struct(&png_ptr, &info_ptr);
if (outfile != NULL)
(void) fclose(outfile);
/*@i2@*/ } /* tell splint to ignore false warning for not
released memory of png_ptr and info_ptr */
static void
BufferPixelToRGB(uint32_t pixel, uint16_t *r, uint16_t *g, uint16_t *b)
{
*r = (uint16_t) ((pixel >> myFormat.redShift) & myFormat.redMax);
*b = (uint16_t) ((pixel >> myFormat.blueShift) & myFormat.blueMax);
*g = (uint16_t) ((pixel >> myFormat.greenShift) & myFormat.greenMax);
}
void
ShrinkBuffer(uint32_t x, uint32_t y, uint32_t req_width, uint32_t req_height)
{
size_t start;
size_t stride;
size_t row, col;
uint8_t *cp;
/*
* Don't bother if x and y are zero and the width is the same.
*/
if (x == 0 && y == 0 && req_width == si.framebufferWidth) {
return;
}
/*
* Rather than creating a copy, we just move in-place. Since we are
* doing this from the start of the image, there is no problem
* with overlapping moves.
*/
stride = (size_t)(si.framebufferWidth * RAW_BYTES_PER_PIXEL - (int32_t)req_width * RAW_BYTES_PER_PIXEL);
start = (x + y * si.framebufferWidth) * RAW_BYTES_PER_PIXEL;
cp = rawBuffer;
for (row = 0; row < req_height; row++) {
for (col = 0; col < req_width; col++) {
*cp++ = rawBuffer[start++];
*cp++ = rawBuffer[start++];
*cp++ = rawBuffer[start++];
}
start += stride;
}
}