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mapimageio.c
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mapimageio.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Low level PNG/JPEG/GIF image io native functions
* Author: Thomas Bonfort (tbonfort)
*
******************************************************************************
* Copyright (c) 2009 Thomas Bonfort
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "mapserver.h"
#include "png.h"
#include "setjmp.h"
#include <assert.h>
#include "jpeglib.h"
#include <stdlib.h>
#ifdef USE_GIF
#include "gif_lib.h"
#endif
typedef struct _streamInfo {
FILE *fp;
bufferObj *buffer;
} streamInfo;
void png_write_data_to_stream(png_structp png_ptr, png_bytep data, png_size_t length)
{
FILE *fp = ((streamInfo*)png_get_io_ptr(png_ptr))->fp;
msIO_fwrite(data,length,1,fp);
}
void png_write_data_to_buffer(png_structp png_ptr, png_bytep data, png_size_t length)
{
bufferObj *buffer = ((streamInfo*)png_get_io_ptr(png_ptr))->buffer;
msBufferAppend(buffer,data,length);
}
void png_flush_data(png_structp png_ptr)
{
/* do nothing */
}
typedef struct {
struct jpeg_destination_mgr pub;
unsigned char *data;
} ms_destination_mgr;
typedef struct {
ms_destination_mgr mgr;
FILE *stream;
} ms_stream_destination_mgr;
typedef struct {
ms_destination_mgr mgr;
bufferObj *buffer;
} ms_buffer_destination_mgr;
#define OUTPUT_BUF_SIZE 4096
void
jpeg_init_destination (j_compress_ptr cinfo)
{
ms_destination_mgr *dest = (ms_destination_mgr*) cinfo->dest;
/* Allocate the output buffer --- it will be released when done with image */
dest->data = (unsigned char *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
OUTPUT_BUF_SIZE * sizeof (unsigned char));
dest->pub.next_output_byte = dest->data;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
void jpeg_stream_term_destination (j_compress_ptr cinfo)
{
ms_stream_destination_mgr *dest = (ms_stream_destination_mgr*) cinfo->dest;
msIO_fwrite(dest->mgr.data, OUTPUT_BUF_SIZE-dest->mgr.pub.free_in_buffer, 1, dest->stream);
dest->mgr.pub.next_output_byte = dest->mgr.data;
dest->mgr.pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
void jpeg_buffer_term_destination (j_compress_ptr cinfo)
{
ms_buffer_destination_mgr *dest = (ms_buffer_destination_mgr*) cinfo->dest;
msBufferAppend(dest->buffer, dest->mgr.data, OUTPUT_BUF_SIZE-dest->mgr.pub.free_in_buffer);
dest->mgr.pub.next_output_byte = dest->mgr.data;
dest->mgr.pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
int jpeg_stream_empty_output_buffer (j_compress_ptr cinfo)
{
ms_stream_destination_mgr *dest = (ms_stream_destination_mgr*) cinfo->dest;
msIO_fwrite(dest->mgr.data, OUTPUT_BUF_SIZE, 1, dest->stream);
dest->mgr.pub.next_output_byte = dest->mgr.data;
dest->mgr.pub.free_in_buffer = OUTPUT_BUF_SIZE;
return TRUE;
}
int jpeg_buffer_empty_output_buffer (j_compress_ptr cinfo)
{
ms_buffer_destination_mgr *dest = (ms_buffer_destination_mgr*) cinfo->dest;
msBufferAppend(dest->buffer, dest->mgr.data, OUTPUT_BUF_SIZE);
dest->mgr.pub.next_output_byte = dest->mgr.data;
dest->mgr.pub.free_in_buffer = OUTPUT_BUF_SIZE;
return TRUE;
}
int saveAsJPEG(mapObj *map /*not used*/, rasterBufferObj *rb, streamInfo *info,
outputFormatObj *format)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
int quality = atoi(msGetOutputFormatOption( format, "QUALITY", "75"));
ms_destination_mgr *dest;
JSAMPLE *rowdata;
unsigned int row;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
if (cinfo.dest == NULL) {
if(info->fp) {
cinfo.dest = (struct jpeg_destination_mgr *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof (ms_stream_destination_mgr));
((ms_stream_destination_mgr*)cinfo.dest)->mgr.pub.empty_output_buffer = jpeg_stream_empty_output_buffer;
((ms_stream_destination_mgr*)cinfo.dest)->mgr.pub.term_destination = jpeg_stream_term_destination;
((ms_stream_destination_mgr*)cinfo.dest)->stream = info->fp;
} else {
cinfo.dest = (struct jpeg_destination_mgr *)
(*cinfo.mem->alloc_small) ((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof (ms_buffer_destination_mgr));
((ms_buffer_destination_mgr*)cinfo.dest)->mgr.pub.empty_output_buffer = jpeg_buffer_empty_output_buffer;
((ms_buffer_destination_mgr*)cinfo.dest)->mgr.pub.term_destination = jpeg_buffer_term_destination;
((ms_buffer_destination_mgr*)cinfo.dest)->buffer = info->buffer;
}
}
dest = (ms_destination_mgr*) cinfo.dest;
dest->pub.init_destination = jpeg_init_destination;
cinfo.image_width = rb->width;
cinfo.image_height = rb->height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, TRUE);
jpeg_start_compress(&cinfo, TRUE);
rowdata = (JSAMPLE*)malloc(rb->width*cinfo.input_components*sizeof(JSAMPLE));
for(row=0; row<rb->height; row++) {
JSAMPLE *pixptr = rowdata;
int col;
unsigned char *r,*g,*b;
r=rb->data.rgba.r+row*rb->data.rgba.row_step;
g=rb->data.rgba.g+row*rb->data.rgba.row_step;
b=rb->data.rgba.b+row*rb->data.rgba.row_step;
for(col=0; col<rb->width; col++) {
*(pixptr++) = *r;
*(pixptr++) = *g;
*(pixptr++) = *b;
r+=rb->data.rgba.pixel_step;
g+=rb->data.rgba.pixel_step;
b+=rb->data.rgba.pixel_step;
}
(void) jpeg_write_scanlines(&cinfo, &rowdata, 1);
}
/* Step 6: Finish compression */
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
free(rowdata);
return MS_SUCCESS;
}
/*
* sort a given list of rgba entries so that all the opaque pixels are at the end
*/
int remapPaletteForPNG(rasterBufferObj *rb, rgbPixel *rgb, unsigned char *a, int *num_a)
{
int bot_idx, top_idx, x;
int remap[256];
unsigned int maxval = rb->data.palette.scaling_maxval;
assert(rb->type == MS_BUFFER_BYTE_PALETTE);
/*
** remap the palette colors so that all entries with
** the maximal alpha value (i.e., fully opaque) are at the end and can
** therefore be omitted from the tRNS chunk. Note that the ordering of
** opaque entries is reversed from how they were previously arranged
** --not that this should matter to anyone.
*/
for (top_idx = rb->data.palette.num_entries-1, bot_idx = x = 0; x < rb->data.palette.num_entries; ++x) {
if (rb->data.palette.palette[x].a == maxval)
remap[x] = top_idx--;
else
remap[x] = bot_idx++;
}
/* sanity check: top and bottom indices should have just crossed paths */
if (bot_idx != top_idx + 1) {
msSetError(MS_MISCERR,"quantization sanity check failed","createPNGPalette()");
return MS_FAILURE;
}
*num_a = bot_idx;
for(x=0; x<rb->width*rb->height; x++)
rb->data.palette.pixels[x] = remap[rb->data.palette.pixels[x]];
for (x = 0; x < rb->data.palette.num_entries; ++x) {
if(maxval == 255) {
a[remap[x]] = rb->data.palette.palette[x].a;
rgb[remap[x]].r = rb->data.palette.palette[x].r;
rgb[remap[x]].g = rb->data.palette.palette[x].g;
rgb[remap[x]].b = rb->data.palette.palette[x].b;
} else {
/* rescale palette */
rgb[remap[x]].r = (rb->data.palette.palette[x].r * 255 + (maxval >> 1)) / maxval;
rgb[remap[x]].g = (rb->data.palette.palette[x].g * 255 + (maxval >> 1)) / maxval;
rgb[remap[x]].b = (rb->data.palette.palette[x].b * 255 + (maxval >> 1)) / maxval;
a[remap[x]] = (rb->data.palette.palette[x].a * 255 + (maxval >> 1)) / maxval;
}
if(a[remap[x]] != 255) {
/* un-premultiply pixels */
double da = 255.0/a[remap[x]];
rgb[remap[x]].r *= da;
rgb[remap[x]].g *= da;
rgb[remap[x]].b *= da;
}
}
return MS_SUCCESS;
}
int savePalettePNG(rasterBufferObj *rb, streamInfo *info, int compression)
{
png_infop info_ptr;
rgbPixel rgb[256];
unsigned char a[256];
int num_a;
int row,sample_depth;
png_structp png_ptr = png_create_write_struct(
PNG_LIBPNG_VER_STRING, NULL,NULL,NULL);
assert(rb->type == MS_BUFFER_BYTE_PALETTE);
if (!png_ptr)
return (MS_FAILURE);
png_set_compression_level(png_ptr, compression);
png_set_filter (png_ptr,0, PNG_FILTER_NONE);
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr,
(png_infopp)NULL);
return (MS_FAILURE);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return (MS_FAILURE);
}
if(info->fp)
png_set_write_fn(png_ptr,info, png_write_data_to_stream, png_flush_data);
else
png_set_write_fn(png_ptr,info, png_write_data_to_buffer, png_flush_data);
if (rb->data.palette.num_entries <= 2)
sample_depth = 1;
else if (rb->data.palette.num_entries <= 4)
sample_depth = 2;
else if (rb->data.palette.num_entries <= 16)
sample_depth = 4;
else
sample_depth = 8;
png_set_IHDR(png_ptr, info_ptr, rb->width, rb->height,
sample_depth, PNG_COLOR_TYPE_PALETTE,
0, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
remapPaletteForPNG(rb,rgb,a,&num_a);
png_set_PLTE(png_ptr, info_ptr, (png_colorp)(rgb),rb->data.palette.num_entries);
if(num_a)
png_set_tRNS(png_ptr, info_ptr, a,num_a, NULL);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
for(row=0; row<rb->height; row++) {
unsigned char *rowptr = &(rb->data.palette.pixels[row*rb->width]);
png_write_row(png_ptr, rowptr);
}
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
return MS_SUCCESS;
}
int readPalette(const char *palette, rgbaPixel *entries, unsigned int *nEntries, int useAlpha)
{
FILE *stream = NULL;
char buffer[MS_BUFFER_LENGTH];
int r,g,b,a;
*nEntries = 0;
stream = fopen(palette, "r");
if(!stream) {
msSetError(MS_IOERR, "Error opening palette file %s.", "readPalette()", palette);
return MS_FAILURE;
}
while(fgets(buffer, MS_BUFFER_LENGTH, stream) && *nEntries<256) {
/* while there are colors to load */
if(buffer[0] == '#' || buffer[0] == '\n' || buffer[0] == '\r')
continue; /* skip comments and blank lines */
if(!useAlpha) {
if(3 != sscanf(buffer,"%d,%d,%d\n",&r,&g,&b)) {
msSetError(MS_MISCERR,"failed to parse color %d r,g,b triplet in line \"%s\" from file %s","readPalette()",*nEntries+1,buffer,palette);
return MS_FAILURE;
}
} else {
if(4 != sscanf(buffer,"%d,%d,%d,%d\n",&r,&g,&b,&a)) {
msSetError(MS_MISCERR,"failed to parse color %d r,g,b,a quadruplet in line \"%s\" from file %s","readPalette()",*nEntries+1,buffer,palette);
return MS_FAILURE;
}
}
if(useAlpha && a != 255) {
double da = a/255.0;
entries[*nEntries].r = r * da;
entries[*nEntries].g = g * da;
entries[*nEntries].b = b * da;
entries[*nEntries].a = a;
} else {
entries[*nEntries].r = r;
entries[*nEntries].g = g;
entries[*nEntries].b = b;
entries[*nEntries].a = 255;
}
(*nEntries)++;
}
fclose(stream);
return MS_SUCCESS;
}
int saveAsPNG(mapObj *map,rasterBufferObj *rb, streamInfo *info, outputFormatObj *format)
{
int force_pc256 = MS_FALSE;
int force_palette = MS_FALSE;
int ret = MS_FAILURE;
const char *force_string,*zlib_compression;
int compression = -1;
zlib_compression = msGetOutputFormatOption( format, "COMPRESSION", NULL);
if(zlib_compression && *zlib_compression) {
char *endptr;
compression = strtol(zlib_compression,&endptr,10);
if(*endptr || compression<-1 || compression>9) {
msSetError(MS_MISCERR,"failed to parse FORMATOPTION \"COMPRESSION=%s\", expecting integer from 0 to 9.","saveAsPNG()",zlib_compression);
return MS_FAILURE;
}
}
force_string = msGetOutputFormatOption( format, "QUANTIZE_FORCE", NULL );
if( force_string && (strcasecmp(force_string,"on") == 0 || strcasecmp(force_string,"yes") == 0 || strcasecmp(force_string,"true") == 0) )
force_pc256 = MS_TRUE;
force_string = msGetOutputFormatOption( format, "PALETTE_FORCE", NULL );
if( force_string && (strcasecmp(force_string,"on") == 0 || strcasecmp(force_string,"yes") == 0 || strcasecmp(force_string,"true") == 0) )
force_palette = MS_TRUE;
if(force_pc256 || force_palette) {
rasterBufferObj qrb;
rgbaPixel palette[256], paletteGiven[256];
unsigned int numPaletteGivenEntries;
memset(&qrb,0,sizeof(rasterBufferObj));
qrb.type = MS_BUFFER_BYTE_PALETTE;
qrb.width = rb->width;
qrb.height = rb->height;
qrb.data.palette.pixels = (unsigned char*)malloc(qrb.width*qrb.height*sizeof(unsigned char));
qrb.data.palette.scaling_maxval = 255;
if(force_pc256) {
qrb.data.palette.palette = palette;
qrb.data.palette.num_entries = atoi(msGetOutputFormatOption( format, "QUANTIZE_COLORS", "256"));
ret = msQuantizeRasterBuffer(rb,&(qrb.data.palette.num_entries),qrb.data.palette.palette,
NULL, 0,
&qrb.data.palette.scaling_maxval);
} else {
int colorsWanted = atoi(msGetOutputFormatOption( format, "QUANTIZE_COLORS", "0"));
const char *palettePath = msGetOutputFormatOption( format, "PALETTE", "palette.txt");
char szPath[MS_MAXPATHLEN];
if(map) {
msBuildPath(szPath, map->mappath, palettePath);
palettePath = szPath;
}
if(readPalette(palettePath,paletteGiven,&numPaletteGivenEntries,format->transparent) != MS_SUCCESS) {
return MS_FAILURE;
}
if(numPaletteGivenEntries == 256 || colorsWanted == 0) {
qrb.data.palette.palette = paletteGiven;
qrb.data.palette.num_entries = numPaletteGivenEntries;
ret = MS_SUCCESS;
/* we have a full palette and don't want an additional quantization step */
} else {
/* quantize the image, and mix our colours in the resulting palette */
qrb.data.palette.palette = palette;
qrb.data.palette.num_entries = MS_MAX(colorsWanted,numPaletteGivenEntries);
ret = msQuantizeRasterBuffer(rb,&(qrb.data.palette.num_entries),qrb.data.palette.palette,
paletteGiven,numPaletteGivenEntries,
&qrb.data.palette.scaling_maxval);
}
}
if(ret != MS_FAILURE) {
ret = msClassifyRasterBuffer(rb,&qrb);
ret = savePalettePNG(&qrb,info,compression);
}
msFree(qrb.data.palette.pixels);
return ret;
} else if(rb->type == MS_BUFFER_BYTE_RGBA) {
png_infop info_ptr;
int color_type;
int row;
unsigned int *rowdata;
png_structp png_ptr = png_create_write_struct(
PNG_LIBPNG_VER_STRING, NULL,NULL,NULL);
if (!png_ptr)
return (MS_FAILURE);
png_set_compression_level(png_ptr, compression);
png_set_filter (png_ptr,0, PNG_FILTER_NONE);
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr,
(png_infopp)NULL);
return (MS_FAILURE);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return (MS_FAILURE);
}
if(info->fp)
png_set_write_fn(png_ptr,info, png_write_data_to_stream, png_flush_data);
else
png_set_write_fn(png_ptr,info, png_write_data_to_buffer, png_flush_data);
if(rb->data.rgba.a)
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
else
color_type = PNG_COLOR_TYPE_RGB;
png_set_IHDR(png_ptr, info_ptr, rb->width, rb->height,
8, color_type, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
if(!rb->data.rgba.a && rb->data.rgba.pixel_step==4)
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
rowdata = (unsigned int*)malloc(rb->width*sizeof(unsigned int));
for(row=0; row<rb->height; row++) {
unsigned int *pixptr = rowdata;
int col;
unsigned char *a,*r,*g,*b;
r=rb->data.rgba.r+row*rb->data.rgba.row_step;
g=rb->data.rgba.g+row*rb->data.rgba.row_step;
b=rb->data.rgba.b+row*rb->data.rgba.row_step;
if(rb->data.rgba.a) {
a=rb->data.rgba.a+row*rb->data.rgba.row_step;
for(col=0; col<rb->width; col++) {
if(*a) {
double da = *a/255.0;
unsigned char *pix = (unsigned char*)pixptr;
pix[0] = *r/da;
pix[1] = *g/da;
pix[2] = *b/da;
pix[3] = *a;
} else {
*pixptr=0;
}
pixptr++;
a+=rb->data.rgba.pixel_step;
r+=rb->data.rgba.pixel_step;
g+=rb->data.rgba.pixel_step;
b+=rb->data.rgba.pixel_step;
}
} else {
for(col=0; col<rb->width; col++) {
unsigned char *pix = (unsigned char*)pixptr;
pix[0] = *r;
pix[1] = *g;
pix[2] = *b;
pixptr++;
r+=rb->data.rgba.pixel_step;
g+=rb->data.rgba.pixel_step;
b+=rb->data.rgba.pixel_step;
}
}
png_write_row(png_ptr,(png_bytep)rowdata);
}
png_write_end(png_ptr, info_ptr);
free(rowdata);
png_destroy_write_struct(&png_ptr, &info_ptr);
return MS_SUCCESS;
} else {
msSetError(MS_MISCERR,"Unknown buffer type","saveAsPNG()");
return MS_FAILURE;
}
}
/* For platforms with incomplete ANSI defines. Fortunately,
SEEK_SET is defined to be zero by the standard. */
#ifndef SEEK_SET
#define SEEK_SET 0
#endif /* SEEK_SET */
#ifdef USE_GD
/* #include <math.h> */
/* #include <string.h> */
/* #include <stdlib.h> */
#include "gd.h"
/* this is used for creating images in main memory */
typedef struct fileIOCtx {
gdIOCtx ctx;
FILE *f;
}
fileIOCtx;
static void msFreeFileCtx (gdIOCtx * ctx)
{
free(ctx);
}
static int filePutbuf (gdIOCtx * ctx, const void *buf, int size)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
return fwrite (buf, 1, size, fctx->f);
}
static int fileGetbuf (gdIOCtx * ctx, void *buf, int size)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
return (msIO_fread (buf, 1, size, fctx->f));
}
static void filePutchar (gdIOCtx * ctx, int a)
{
unsigned char b;
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
b = a;
putc (b, fctx->f);
}
static int fileGetchar (gdIOCtx * ctx)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
return getc (fctx->f);
}
static int fileSeek (struct gdIOCtx *ctx, const int pos)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
return (fseek (fctx->f, pos, SEEK_SET) == 0);
}
static long fileTell (struct gdIOCtx *ctx)
{
fileIOCtx *fctx;
fctx = (fileIOCtx *) ctx;
return ftell (fctx->f);
}
/* return data as a dynamic pointer */
gdIOCtx *msNewGDFileCtx (FILE * f)
{
fileIOCtx *ctx;
ctx = (fileIOCtx *) malloc (sizeof (fileIOCtx));
if (ctx == NULL) {
return NULL;
}
ctx->f = f;
ctx->ctx.getC = fileGetchar;
ctx->ctx.putC = filePutchar;
ctx->ctx.getBuf = fileGetbuf;
ctx->ctx.putBuf = filePutbuf;
ctx->ctx.tell = fileTell;
ctx->ctx.seek = fileSeek;
ctx->ctx.gd_free = msFreeFileCtx;
return (gdIOCtx *) ctx;
}
static const unsigned char PNGsig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; /* 89 50 4E 47 0D 0A 1A 0A hex */
int msLoadGDRasterBufferFromFile(char *path, rasterBufferObj *rb)
{
FILE *stream;
char bytes[8];
gdImagePtr img = NULL;
stream = fopen(path,"rb");
if(!stream) {
msSetError(MS_MISCERR, "unable to open file %s for reading", "loadGDImg()", path);
return MS_FAILURE;
}
if(1 != fread(bytes,8,1,stream)) { /* read some bytes to try and identify the file */
msSetError(MS_MISCERR, "Unable to read header from image file %s", "msLoadGDRasterBufferFromFile()",path);
return MS_FAILURE;
}
rewind(stream); /* reset the image for the readers */
if(memcmp(bytes,"GIF8",4)==0) {
#ifdef USE_GD_GIF
gdIOCtx *ctx;
ctx = msNewGDFileCtx(stream);
img = gdImageCreateFromGifCtx(ctx);
ctx->gd_free(ctx);
#else
msSetError(MS_MISCERR, "Unable to load GIF symbol.", "msLoadGDRasterBufferFromFile()");
return MS_FAILURE;
#endif
} else if (memcmp(bytes,PNGsig,8)==0) {
#ifdef USE_GD_PNG
gdIOCtx *ctx;
ctx = msNewGDFileCtx(stream);
img = gdImageCreateFromPngCtx(ctx);
ctx->gd_free(ctx);
#else
msSetError(MS_MISCERR, "Unable to load PNG symbol.", "msLoadGDRasterBufferFromFile()");
return MS_FAILURE;
#endif
}
fclose(stream);
if(!img) {
msSetError(MS_GDERR, NULL, "loadGDImg()");
rb->type = MS_BUFFER_NONE;
return MS_FAILURE;
}
if(gdImageTrueColor(img)) {
int x,y;
gdImagePtr pimg = gdImageCreate(gdImageSX(img),gdImageSY(img));
gdImageColorAllocateAlpha(pimg,0,0,0,127);
for(y = 0 ; y < gdImageSY(img); y++) {
for(x = 0; x < gdImageSX(img); x++) {
int pix = gdImageGetTrueColorPixel(img,x,y);
if(gdTrueColorGetAlpha(pix) == 127) {
gdImageSetPixel(pimg,x,y,0);
pimg->transparent = 0;
} else {
gdImageSetPixel(pimg,x,y,gdImageColorResolveAlpha(pimg,gdTrueColorGetRed(pix),gdTrueColorGetGreen(pix),
gdTrueColorGetBlue(pix),gdTrueColorGetAlpha(pix)));
}
}
}
gdImageDestroy(img);
img = pimg;
}
rb->type = MS_BUFFER_GD;
rb->width = gdImageSX(img);
rb->height = gdImageSY(img);
rb->data.gd_img = img;
return MS_SUCCESS;
}
#endif
int readPNG(char *path, rasterBufferObj *rb)
{
png_uint_32 width,height;
unsigned char *a,*r,*g,*b;
int bit_depth,color_type,i;
unsigned char **row_pointers;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
FILE *stream = fopen(path,"rb");
if(!stream)
return MS_FAILURE;
/* could pass pointers to user-defined error handlers instead of NULLs: */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
return MS_FAILURE; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return MS_FAILURE; /* out of memory */
}
if(setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr,&info_ptr,NULL);
return MS_FAILURE;
}
png_init_io(png_ptr,stream);
png_read_info(png_ptr,info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type,
NULL,NULL,NULL);
rb->width = width;
rb->height = height;
rb->type = MS_BUFFER_BYTE_RGBA;
rb->data.rgba.pixels = (unsigned char*)malloc(width*height*4*sizeof(unsigned char));
row_pointers = (unsigned char**)malloc(height*sizeof(unsigned char*));
rb->data.rgba.pixel_step=4;
rb->data.rgba.row_step = width*4;
b = rb->data.rgba.b = &rb->data.rgba.pixels[0];
g = rb->data.rgba.g = &rb->data.rgba.pixels[1];
r = rb->data.rgba.r = &rb->data.rgba.pixels[2];
a = rb->data.rgba.a = &rb->data.rgba.pixels[3];
for(i=0; i<height; i++) {
row_pointers[i] = &(rb->data.rgba.pixels[i*rb->data.rgba.row_step]);
}
if (color_type == PNG_COLOR_TYPE_PALETTE)
/* expand palette images to RGB */
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
/* expand low bit-depth grayscale to 8bits */
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
/* expand transparency chunks to full alpha */
png_set_expand(png_ptr);
if (bit_depth == 16)
/* scale 16bits down to 8 */
png_set_strip_16(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
/* convert grayscale to rgba */
png_set_gray_to_rgb(png_ptr);
png_set_bgr(png_ptr);
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_PALETTE)
png_set_add_alpha(png_ptr, 0xff, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
assert(png_get_rowbytes(png_ptr, info_ptr) == rb->data.rgba.row_step);
png_read_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers=NULL;
png_read_end(png_ptr,NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
/*premultiply data*/
for(i=0; i<width*height; i++) {
if(*a < 255) {
if(*a == 0) {
*r=*g=*b=0;
} else {
*r = (*r * *a + 255) >> 8;
*g = (*g * *a + 255) >> 8;
*b = (*b * *a + 255) >> 8;
}
}
a+=4;
b+=4;
g+=4;
r+=4;
}
fclose(stream);
return MS_SUCCESS;
}
#ifdef USE_GD
int saveGdImage(gdImagePtr ip, FILE *fp, outputFormatObj *format)
{
gdIOCtx *ctx = NULL;
if (fp && (fp == stdout))
ctx = msIO_getGDIOCtx( fp );
if(strcasecmp("ON", msGetOutputFormatOption(format, "INTERLACE", "ON")) == 0)
gdImageInterlace(ip, 1);
if(format->transparent)
gdImageColorTransparent(ip, 0);
if(strcasestr(format->driver, "/gif")) {
#ifdef USE_GD_GIF
if (ctx)
gdImageGifCtx(ip, ctx);
else
gdImageGif(ip, fp);
#else
msSetError(MS_MISCERR, "GIF output is not available.", "saveImageGD()");
return(MS_FAILURE);
#endif
} else if(strcasestr(format->driver, "/png")) {
#ifdef USE_GD_PNG
if (ctx)
gdImagePngCtx(ip, ctx);
else
gdImagePng(ip, fp);
#else
msSetError(MS_MISCERR, "PNG output is not available.", "saveImageGD()");
return(MS_FAILURE);
#endif
} else if(strcasestr(format->driver, "/jpeg")) {
#ifdef USE_GD_JPEG
if (ctx)
gdImageJpegCtx(ip, ctx, atoi(msGetOutputFormatOption( format, "QUALITY", "75")));
else
gdImageJpeg(ip, fp, atoi(msGetOutputFormatOption( format, "QUALITY", "75")));
#else
msSetError(MS_MISCERR, "JPEG output is not available.", "saveImageGD()");
return(MS_FAILURE);
#endif
} else {
msSetError(MS_MISCERR, "Unknown or unsupported format.", "saveImageGD()");
return(MS_FAILURE);
}
msFree(ctx);
return MS_SUCCESS;
}
int saveGdImageBuffer(gdImagePtr ip, bufferObj *buffer, outputFormatObj *format)
{
gdIOCtx *ctx;
int tmp_size;
ctx = gdNewDynamicCtx (2048, NULL);
if( format->imagemode == MS_IMAGEMODE_RGBA )
gdImageSaveAlpha( ip, 1 );
else if( format->imagemode == MS_IMAGEMODE_RGB )
gdImageSaveAlpha( ip, 0 );
if(strcasecmp("ON", msGetOutputFormatOption(format, "INTERLACE", "ON")) == 0)
gdImageInterlace(ip, 1);
if(format->transparent)
gdImageColorTransparent(ip, 0);
if(strcasestr(format->driver, "/gif")) {
#ifdef USE_GD_GIF
gdImageGifCtx( ip, ctx );
#else
msSetError(MS_MISCERR, "GIF output is not available.", "saveImageGD()");
ctx->gd_free(ctx);
return(MS_FAILURE);
#endif
} else if(strcasestr(format->driver, "/png")) {
#ifdef USE_GD_PNG
gdImagePngCtx(ip, ctx);
#else
msSetError(MS_MISCERR, "PNG output is not available.", "saveImageGD()");
ctx->gd_free(ctx);
return(MS_FAILURE);
#endif
} else if(strcasestr(format->driver, "/jpeg")) {
#ifdef USE_GD_JPEG
gdImageJpegCtx(ip, ctx, atoi(msGetOutputFormatOption( format, "QUALITY", "75")));
#else
msSetError(MS_MISCERR, "JPEG output is not available.", "saveImageGD()");
ctx->gd_free(ctx);
return(MS_FAILURE);
#endif
} else {
msSetError(MS_MISCERR, "Unknown or unsupported format.", "saveImageGD()");
ctx->gd_free(ctx);
return(MS_FAILURE);
}
/* gdDPExtractData expects a int*, but bufferObj::size is a size_t */
/* so use a temp variable to hold it */
buffer->data = gdDPExtractData (ctx, &tmp_size);
buffer->size = tmp_size;
ctx->gd_free(ctx);
return MS_SUCCESS;
}
#endif
int msSaveRasterBuffer(mapObj *map, rasterBufferObj *rb, FILE *stream,
outputFormatObj *format)
{
#ifdef USE_GD
if(rb->type == MS_BUFFER_GD) {
return saveGdImage(rb->data.gd_img, stream, format);
}
#else
assert(rb->type != MS_BUFFER_GD);
#endif
if(strcasestr(format->driver,"/png")) {
streamInfo info;
info.fp = stream;
info.buffer = NULL;
return saveAsPNG(map, rb,&info,format);
} else if(strcasestr(format->driver,"/jpeg")) {
streamInfo info;
info.fp = stream;
info.buffer=NULL;
return saveAsJPEG(map, rb,&info,format);
} else {
msSetError(MS_MISCERR,"unsupported image format\n", "msSaveRasterBuffer()");
return MS_FAILURE;
}
}
int msSaveRasterBufferToBuffer(rasterBufferObj *data, bufferObj *buffer,
outputFormatObj *format)
{
#ifdef USE_GD
if(data->type == MS_BUFFER_GD) {
return saveGdImageBuffer(data->data.gd_img, buffer, format);
}
#else
assert(data->type != MS_BUFFER_GD);
#endif
if(strcasestr(format->driver,"/png")) {
streamInfo info;
info.fp = NULL;
info.buffer = buffer;
return saveAsPNG(NULL, data,&info,format);
} else if(strcasestr(format->driver,"/jpeg")) {
streamInfo info;
info.fp = NULL;
info.buffer=buffer;
return saveAsJPEG(NULL, data,&info,format);
} else {
msSetError(MS_MISCERR,"unsupported image format\n", "msSaveRasterBuffer()");
return MS_FAILURE;
}
}
#ifdef USE_GIF
static char const *gif_error_msg()
{
static char msg[80];