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Image: Fix Wclobbered warnings 

From C99 spec:
[...]  objects of automatic storage duration that are local to the function containing the invocation of the corresponding setjmp macro that do not have volatile-qualified type and have been changed between the setjmp invocation and longjmp call are indeterminate

Remove the variables in question or pass them as const refs.
This commit is contained in:
Peter Keresztes Schmidt 2021-09-12 11:28:57 +02:00
parent 385d1602e0
commit ecf6cc80aa
2 changed files with 52 additions and 54 deletions
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104
src/zm_image.cpp
View File

@ -935,14 +935,13 @@ bool Image::WriteRaw(const char *filename) const {
bool Image::ReadJpeg(const std::string &filename, unsigned int p_colours, unsigned int p_subpixelorder) {
unsigned int new_width, new_height, new_colours, new_subpixelorder;
struct jpeg_decompress_struct *cinfo = readjpg_dcinfo;
if ( !cinfo ) {
cinfo = readjpg_dcinfo = new jpeg_decompress_struct;
cinfo->err = jpeg_std_error(&jpg_err.pub);
if ( !readjpg_dcinfo ) {
readjpg_dcinfo = new jpeg_decompress_struct;
readjpg_dcinfo->err = jpeg_std_error(&jpg_err.pub);
jpg_err.pub.error_exit = zm_jpeg_error_exit;
jpg_err.pub.emit_message = zm_jpeg_emit_message;
jpeg_create_decompress(cinfo);
jpeg_create_decompress(readjpg_dcinfo);
}
FILE *infile;
@ -952,30 +951,30 @@ bool Image::ReadJpeg(const std::string &filename, unsigned int p_colours, unsign
}
if ( setjmp(jpg_err.setjmp_buffer) ) {
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(readjpg_dcinfo);
fclose(infile);
return false;
}
jpeg_stdio_src(cinfo, infile);
jpeg_stdio_src(readjpg_dcinfo, infile);
jpeg_read_header(cinfo, TRUE);
jpeg_read_header(readjpg_dcinfo, TRUE);
if ( (cinfo->num_components != 1) && (cinfo->num_components != 3) ) {
if ( (readjpg_dcinfo->num_components != 1) && (readjpg_dcinfo->num_components != 3) ) {
Error("Unexpected colours when reading jpeg image: %d", colours);
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(readjpg_dcinfo);
fclose(infile);
return false;
}
/* Check if the image has at least one huffman table defined. If not, use the standard ones */
/* This is required for the MJPEG capture palette of USB devices */
if ( cinfo->dc_huff_tbl_ptrs[0] == nullptr ) {
zm_use_std_huff_tables(cinfo);
if ( readjpg_dcinfo->dc_huff_tbl_ptrs[0] == nullptr ) {
zm_use_std_huff_tables(readjpg_dcinfo);
}
new_width = cinfo->image_width;
new_height = cinfo->image_height;
new_width = readjpg_dcinfo->image_width;
new_height = readjpg_dcinfo->image_height;
if ( (width != new_width) || (height != new_height) ) {
Debug(9, "Image dimensions differ. Old: %ux%u New: %ux%u", width, height, new_width, new_height);
@ -983,7 +982,7 @@ bool Image::ReadJpeg(const std::string &filename, unsigned int p_colours, unsign
switch ( p_colours ) {
case ZM_COLOUR_GRAY8:
cinfo->out_color_space = JCS_GRAYSCALE;
readjpg_dcinfo->out_color_space = JCS_GRAYSCALE;
new_colours = ZM_COLOUR_GRAY8;
new_subpixelorder = ZM_SUBPIX_ORDER_NONE;
break;
@ -991,17 +990,17 @@ bool Image::ReadJpeg(const std::string &filename, unsigned int p_colours, unsign
#ifdef JCS_EXTENSIONS
new_colours = ZM_COLOUR_RGB32;
if ( p_subpixelorder == ZM_SUBPIX_ORDER_BGRA ) {
cinfo->out_color_space = JCS_EXT_BGRX;
readjpg_dcinfo->out_color_space = JCS_EXT_BGRX;
new_subpixelorder = ZM_SUBPIX_ORDER_BGRA;
} else if ( p_subpixelorder == ZM_SUBPIX_ORDER_ARGB ) {
cinfo->out_color_space = JCS_EXT_XRGB;
readjpg_dcinfo->out_color_space = JCS_EXT_XRGB;
new_subpixelorder = ZM_SUBPIX_ORDER_ARGB;
} else if ( p_subpixelorder == ZM_SUBPIX_ORDER_ABGR ) {
cinfo->out_color_space = JCS_EXT_XBGR;
readjpg_dcinfo->out_color_space = JCS_EXT_XBGR;
new_subpixelorder = ZM_SUBPIX_ORDER_ABGR;
} else {
/* Assume RGBA */
cinfo->out_color_space = JCS_EXT_RGBX;
readjpg_dcinfo->out_color_space = JCS_EXT_RGBX;
new_subpixelorder = ZM_SUBPIX_ORDER_RGBA;
}
break;
@ -1013,7 +1012,7 @@ bool Image::ReadJpeg(const std::string &filename, unsigned int p_colours, unsign
new_colours = ZM_COLOUR_RGB24;
if ( p_subpixelorder == ZM_SUBPIX_ORDER_BGR ) {
#ifdef JCS_EXTENSIONS
cinfo->out_color_space = JCS_EXT_BGR;
readjpg_dcinfo->out_color_space = JCS_EXT_BGR;
new_subpixelorder = ZM_SUBPIX_ORDER_BGR;
#else
Warning("libjpeg-turbo is required for reading a JPEG directly into a BGR24 buffer, reading into a RGB24 buffer instead.");
@ -1029,7 +1028,7 @@ cinfo->out_color_space = JCS_EXT_RGB;
cinfo->out_color_space = JCS_RGB;
#endif
*/
cinfo->out_color_space = JCS_RGB;
readjpg_dcinfo->out_color_space = JCS_RGB;
new_subpixelorder = ZM_SUBPIX_ORDER_RGB;
}
break;
@ -1037,20 +1036,20 @@ cinfo->out_color_space = JCS_RGB;
if ( WriteBuffer(new_width, new_height, new_colours, new_subpixelorder) == nullptr ) {
Error("Failed requesting writeable buffer for reading JPEG image.");
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(readjpg_dcinfo);
fclose(infile);
return false;
}
jpeg_start_decompress(cinfo);
jpeg_start_decompress(readjpg_dcinfo);
JSAMPROW row_pointer = buffer;
while ( cinfo->output_scanline < cinfo->output_height ) {
jpeg_read_scanlines(cinfo, &row_pointer, 1);
while ( readjpg_dcinfo->output_scanline < readjpg_dcinfo->output_height ) {
jpeg_read_scanlines(readjpg_dcinfo, &row_pointer, 1);
row_pointer += linesize;
}
jpeg_finish_decompress(cinfo);
jpeg_finish_decompress(readjpg_dcinfo);
fclose(infile);
@ -1078,7 +1077,7 @@ bool Image::WriteJpeg(const std::string &filename, int quality_override, SystemT
}
bool Image::WriteJpeg(const std::string &filename,
int quality_override,
const int &quality_override,
SystemTimePoint timestamp,
bool on_blocking_abort) const {
if ( config.colour_jpeg_files && (colours == ZM_COLOUR_GRAY8) ) {
@ -1247,39 +1246,38 @@ bool Image::DecodeJpeg(
unsigned int p_subpixelorder)
{
unsigned int new_width, new_height, new_colours, new_subpixelorder;
struct jpeg_decompress_struct *cinfo = decodejpg_dcinfo;
if ( !cinfo ) {
cinfo = decodejpg_dcinfo = new jpeg_decompress_struct;
cinfo->err = jpeg_std_error( &jpg_err.pub );
if ( !decodejpg_dcinfo ) {
decodejpg_dcinfo = new jpeg_decompress_struct;
decodejpg_dcinfo->err = jpeg_std_error( &jpg_err.pub );
jpg_err.pub.error_exit = zm_jpeg_error_exit;
jpg_err.pub.emit_message = zm_jpeg_emit_message;
jpeg_create_decompress( cinfo );
jpeg_create_decompress( decodejpg_dcinfo );
}
if ( setjmp(jpg_err.setjmp_buffer) ) {
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(decodejpg_dcinfo);
return false;
}
zm_jpeg_mem_src(cinfo, inbuffer, inbuffer_size);
zm_jpeg_mem_src(decodejpg_dcinfo, inbuffer, inbuffer_size);
jpeg_read_header(cinfo, TRUE);
jpeg_read_header(decodejpg_dcinfo, TRUE);
if ( (cinfo->num_components != 1) && (cinfo->num_components != 3) ) {
if ( (decodejpg_dcinfo->num_components != 1) && (decodejpg_dcinfo->num_components != 3) ) {
Error("Unexpected colours when reading jpeg image: %d", colours);
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(decodejpg_dcinfo);
return false;
}
/* Check if the image has at least one huffman table defined. If not, use the standard ones */
/* This is required for the MJPEG capture palette of USB devices */
if ( cinfo->dc_huff_tbl_ptrs[0] == nullptr ) {
zm_use_std_huff_tables(cinfo);
if ( decodejpg_dcinfo->dc_huff_tbl_ptrs[0] == nullptr ) {
zm_use_std_huff_tables(decodejpg_dcinfo);
}
new_width = cinfo->image_width;
new_height = cinfo->image_height;
new_width = decodejpg_dcinfo->image_width;
new_height = decodejpg_dcinfo->image_height;
if ( (width != new_width) || (height != new_height) ) {
Debug(9, "Image dimensions differ. Old: %ux%u New: %ux%u",
@ -1288,7 +1286,7 @@ bool Image::DecodeJpeg(
switch (p_colours) {
case ZM_COLOUR_GRAY8:
cinfo->out_color_space = JCS_GRAYSCALE;
decodejpg_dcinfo->out_color_space = JCS_GRAYSCALE;
new_colours = ZM_COLOUR_GRAY8;
new_subpixelorder = ZM_SUBPIX_ORDER_NONE;
break;
@ -1296,17 +1294,17 @@ bool Image::DecodeJpeg(
#ifdef JCS_EXTENSIONS
new_colours = ZM_COLOUR_RGB32;
if ( p_subpixelorder == ZM_SUBPIX_ORDER_BGRA ) {
cinfo->out_color_space = JCS_EXT_BGRX;
decodejpg_dcinfo->out_color_space = JCS_EXT_BGRX;
new_subpixelorder = ZM_SUBPIX_ORDER_BGRA;
} else if ( p_subpixelorder == ZM_SUBPIX_ORDER_ARGB ) {
cinfo->out_color_space = JCS_EXT_XRGB;
decodejpg_dcinfo->out_color_space = JCS_EXT_XRGB;
new_subpixelorder = ZM_SUBPIX_ORDER_ARGB;
} else if ( p_subpixelorder == ZM_SUBPIX_ORDER_ABGR ) {
cinfo->out_color_space = JCS_EXT_XBGR;
decodejpg_dcinfo->out_color_space = JCS_EXT_XBGR;
new_subpixelorder = ZM_SUBPIX_ORDER_ABGR;
} else {
/* Assume RGBA */
cinfo->out_color_space = JCS_EXT_RGBX;
decodejpg_dcinfo->out_color_space = JCS_EXT_RGBX;
new_subpixelorder = ZM_SUBPIX_ORDER_RGBA;
}
break;
@ -1318,7 +1316,7 @@ bool Image::DecodeJpeg(
new_colours = ZM_COLOUR_RGB24;
if ( p_subpixelorder == ZM_SUBPIX_ORDER_BGR ) {
#ifdef JCS_EXTENSIONS
cinfo->out_color_space = JCS_EXT_BGR;
decodejpg_dcinfo->out_color_space = JCS_EXT_BGR;
new_subpixelorder = ZM_SUBPIX_ORDER_BGR;
#else
Warning("libjpeg-turbo is required for reading a JPEG directly into a BGR24 buffer, reading into a RGB24 buffer instead.");
@ -1334,7 +1332,7 @@ cinfo->out_color_space = JCS_EXT_RGB;
cinfo->out_color_space = JCS_RGB;
#endif
*/
cinfo->out_color_space = JCS_RGB;
decodejpg_dcinfo->out_color_space = JCS_RGB;
new_subpixelorder = ZM_SUBPIX_ORDER_RGB;
}
break;
@ -1342,19 +1340,19 @@ cinfo->out_color_space = JCS_RGB;
if ( WriteBuffer(new_width, new_height, new_colours, new_subpixelorder) == nullptr ) {
Error("Failed requesting writeable buffer for reading JPEG image.");
jpeg_abort_decompress(cinfo);
jpeg_abort_decompress(decodejpg_dcinfo);
return false;
}
jpeg_start_decompress(cinfo);
jpeg_start_decompress(decodejpg_dcinfo);
JSAMPROW row_pointer = buffer; /* pointer to a single row */
while ( cinfo->output_scanline < cinfo->output_height ) {
jpeg_read_scanlines(cinfo, &row_pointer, 1);
while ( decodejpg_dcinfo->output_scanline < decodejpg_dcinfo->output_height ) {
jpeg_read_scanlines(decodejpg_dcinfo, &row_pointer, 1);
row_pointer += linesize;
}
jpeg_finish_decompress(cinfo);
jpeg_finish_decompress(decodejpg_dcinfo);
return true;
}

2
src/zm_image.h
View File

@ -241,7 +241,7 @@ class Image {
bool WriteJpeg(const std::string &filename, SystemTimePoint timestamp) const;
bool WriteJpeg(const std::string &filename, int quality_override, SystemTimePoint timestamp) const;
bool WriteJpeg(const std::string &filename,
int quality_override,
const int &quality_override,
SystemTimePoint timestamp,
bool on_blocking_abort) const;