diff options
Diffstat (limited to 'converter')
| -rw-r--r-- | converter/other/pngtopnm.c | 261 |
1 files changed, 122 insertions, 139 deletions
diff --git a/converter/other/pngtopnm.c b/converter/other/pngtopnm.c index 86db5a47..50ccfdbb 100644 --- a/converter/other/pngtopnm.c +++ b/converter/other/pngtopnm.c @@ -16,20 +16,6 @@ ** with lots of bits pasted from libpng.txt by Guy Eric Schalnat */ -/* - BJH 20000408: rename PPM_MAXMAXVAL to PPM_OVERALLMAXVAL - BJH 20000303: fix include statement so dependencies work out right. -*/ -/* GRR 19991203: moved VERSION to new version.h header file */ - -/* GRR 19990713: fixed redundant freeing of png_ptr and info_ptr in setjmp() - * blocks and added "pm_close(ifp)" in each. */ - -/* GRR 19990317: declared "clobberable" automatic variables in convertpng() - * static to fix Solaris/gcc stack-corruption bug. Also installed custom - * error-handler to avoid jmp_buf size-related problems (i.e., jmp_buf - * compiled with one size in libpng and another size here). */ - #ifndef PNMTOPNG_WARNING_LEVEL # define PNMTOPNG_WARNING_LEVEL 0 /* use 0 for backward compatibility, */ #endif /* 2 for warnings (1 == error) */ @@ -48,24 +34,6 @@ typedef struct _jmpbuf_wrapper { jmp_buf jmpbuf; } jmpbuf_wrapper; -/* GRR 19991205: this is used as a test for pre-1999 versions of netpbm and - * pbmplus vs. 1999 or later (in which pm_close was split into two) - */ -#ifdef PBMPLUS_RAWBITS -# define pm_closer pm_close -# define pm_closew pm_close -#endif - -#ifndef TRUE -# define TRUE 1 -#endif -#ifndef FALSE -# define FALSE 0 -#endif -#ifndef NONE -# define NONE 0 -#endif - enum alpha_handling {ALPHA_NONE, ALPHA_ONLY, ALPHA_MIX}; struct cmdlineInfo { @@ -96,8 +64,7 @@ typedef struct { static png_uint_16 maxval; -static int verbose = FALSE; -static int mtime; +static bool verbose; static jmpbuf_wrapper pngtopnm_jmpbuf_struct; @@ -182,12 +149,9 @@ parseCommandLine(int argc, - -#define get_png_val(p) _get_png_val (&(p), info_ptr->bit_depth) - static png_uint_16 -_get_png_val (png_byte ** const pp, - int const bit_depth) { +get_png_val(const png_byte ** const pp, + int const bit_depth) { png_uint_16 c; @@ -510,7 +474,7 @@ freePngRaster(png_byte ** const pngRaster, static bool isTransparentColor(pngcolor const color, - png_info * const info_ptr, + png_info * const pngInfoP, double const totalgamma) { /*---------------------------------------------------------------------------- Return TRUE iff pixels of color 'color' are supposed to be transparent @@ -518,8 +482,8 @@ isTransparentColor(pngcolor const color, -----------------------------------------------------------------------------*/ bool retval; - if (info_ptr->valid & PNG_INFO_tRNS) { - const png_color_16 * const transColorP = &info_ptr->trans_values; + if (pngInfoP->valid & PNG_INFO_tRNS) { + const png_color_16 * const transColorP = &pngInfoP->trans_values; /* There seems to be a problem here: you can't compare real @@ -874,21 +838,111 @@ getBackgroundColor(png_info * const info_ptr, +#define GET_PNG_VAL(p) get_png_val(&(p), pngInfoP->bit_depth) + + + +static void +makeXelRow(xel * const xelrow, + xelval const maxval, + int const pnmType, + png_info * const pngInfoP, + const png_byte * const pngRasterRow, + pngcolor const bgColor, + enum alpha_handling const alphaHandling, + double const totalgamma) { + + const png_byte * pngPixelP; + unsigned int col; + + pngPixelP = &pngRasterRow[0]; /* initial value */ + for (col = 0; col < pngInfoP->width; ++col) { + switch (pngInfoP->color_type) { + case PNG_COLOR_TYPE_GRAY: { + pngcolor fgColor; + fgColor.r = fgColor.g = fgColor.b = GET_PNG_VAL(pngPixelP); + setXel(&xelrow[col], fgColor, bgColor, alphaHandling, + ((pngInfoP->valid & PNG_INFO_tRNS) && + (fgColor.r == + gamma_correct(pngInfoP->trans_values.gray, totalgamma))) ? + 0 : maxval); + } + break; + + case PNG_COLOR_TYPE_GRAY_ALPHA: { + pngcolor fgColor; + png_uint_16 alpha; + + fgColor.r = fgColor.g = fgColor.b = GET_PNG_VAL(pngPixelP); + alpha = GET_PNG_VAL(pngPixelP); + setXel(&xelrow[col], fgColor, bgColor, alphaHandling, alpha); + } + break; + + case PNG_COLOR_TYPE_PALETTE: { + png_uint_16 const index = GET_PNG_VAL(pngPixelP); + png_color const paletteColor = pngInfoP->palette[index]; + + pngcolor fgColor; + + fgColor.r = paletteColor.red; + fgColor.g = paletteColor.green; + fgColor.b = paletteColor.blue; + + setXel(&xelrow[col], fgColor, bgColor, alphaHandling, + (pngInfoP->valid & PNG_INFO_tRNS) && + index < pngInfoP->num_trans ? + pngInfoP->trans[index] : maxval); + } + break; + + case PNG_COLOR_TYPE_RGB: { + pngcolor fgColor; + + fgColor.r = GET_PNG_VAL(pngPixelP); + fgColor.g = GET_PNG_VAL(pngPixelP); + fgColor.b = GET_PNG_VAL(pngPixelP); + setXel(&xelrow[col], fgColor, bgColor, alphaHandling, + isTransparentColor(fgColor, pngInfoP, totalgamma) ? + 0 : maxval); + } + break; + + case PNG_COLOR_TYPE_RGB_ALPHA: { + pngcolor fgColor; + png_uint_16 alpha; + + fgColor.r = GET_PNG_VAL(pngPixelP); + fgColor.g = GET_PNG_VAL(pngPixelP); + fgColor.b = GET_PNG_VAL(pngPixelP); + alpha = GET_PNG_VAL(pngPixelP); + setXel(&xelrow[col], fgColor, bgColor, alphaHandling, alpha); + } + break; + + default: + pm_error("unknown PNG color type: %d", pngInfoP->color_type); + } + } +} + + + static void writePnm(FILE * const ofP, xelval const maxval, - int const pnm_type, - png_info * const info_ptr, - png_byte ** const png_image, + int const pnmType, + png_info * const pngInfoP, + png_byte ** const pngRaster, pngcolor const bgColor, - enum alpha_handling const alpha_handling, + enum alpha_handling const alphaHandling, double const totalgamma) { /*---------------------------------------------------------------------------- Write a PNM of either the image or the alpha mask, according to - 'alpha_handling' that is in the PNG image described by 'info_ptr' and - png_image. + 'alphaHandling' that is in the PNG image described by 'pngInfoP' and + pngRaster. - 'pnm_type' and 'maxval' are of the output image. + 'pnmType' and 'maxval' are of the output image. Use background color 'bgColor' in the output if the PNG is such that a background color is needed. @@ -898,92 +952,22 @@ writePnm(FILE * const ofP, if (verbose) pm_message("writing a %s file (maxval=%u)", - pnm_type == PBM_TYPE ? "PBM" : - pnm_type == PGM_TYPE ? "PGM" : - pnm_type == PPM_TYPE ? "PPM" : + pnmType == PBM_TYPE ? "PBM" : + pnmType == PGM_TYPE ? "PGM" : + pnmType == PPM_TYPE ? "PPM" : "UNKNOWN!", maxval); - xelrow = pnm_allocrow(info_ptr->width); - - pnm_writepnminit(stdout, info_ptr->width, info_ptr->height, maxval, - pnm_type, FALSE); - - for (row = 0; row < info_ptr->height; ++row) { - png_byte * png_pixelP; - int col; - - png_pixelP = &png_image[row][0]; /* initial value */ - for (col = 0; col < info_ptr->width; ++col) { - switch (info_ptr->color_type) { - case PNG_COLOR_TYPE_GRAY: { - pngcolor fgColor; - fgColor.r = fgColor.g = fgColor.b = get_png_val(png_pixelP); - setXel(&xelrow[col], fgColor, bgColor, alpha_handling, - ((info_ptr->valid & PNG_INFO_tRNS) && - (fgColor.r == - gamma_correct(info_ptr->trans_values.gray, - totalgamma))) ? - 0 : maxval); - } - break; - - case PNG_COLOR_TYPE_GRAY_ALPHA: { - pngcolor fgColor; - png_uint_16 alpha; - - fgColor.r = fgColor.g = fgColor.b = get_png_val(png_pixelP); - alpha = get_png_val(png_pixelP); - setXel(&xelrow[col], fgColor, bgColor, alpha_handling, alpha); - } - break; + xelrow = pnm_allocrow(pngInfoP->width); - case PNG_COLOR_TYPE_PALETTE: { - png_uint_16 const index = get_png_val(png_pixelP); - png_color const paletteColor = info_ptr->palette[index]; + pnm_writepnminit(stdout, pngInfoP->width, pngInfoP->height, maxval, + pnmType, FALSE); - pngcolor fgColor; - - fgColor.r = paletteColor.red; - fgColor.g = paletteColor.green; - fgColor.b = paletteColor.blue; - - setXel(&xelrow[col], fgColor, bgColor, alpha_handling, - (info_ptr->valid & PNG_INFO_tRNS) && - index < info_ptr->num_trans ? - info_ptr->trans[index] : maxval); - } - break; - - case PNG_COLOR_TYPE_RGB: { - pngcolor fgColor; - - fgColor.r = get_png_val(png_pixelP); - fgColor.g = get_png_val(png_pixelP); - fgColor.b = get_png_val(png_pixelP); - setXel(&xelrow[col], fgColor, bgColor, alpha_handling, - isTransparentColor(fgColor, info_ptr, totalgamma) ? - 0 : maxval); - } - break; - - case PNG_COLOR_TYPE_RGB_ALPHA: { - pngcolor fgColor; - png_uint_16 alpha; - - fgColor.r = get_png_val(png_pixelP); - fgColor.g = get_png_val(png_pixelP); - fgColor.b = get_png_val(png_pixelP); - alpha = get_png_val(png_pixelP); - setXel(&xelrow[col], fgColor, bgColor, alpha_handling, alpha); - } - break; + for (row = 0; row < pngInfoP->height; ++row) { + makeXelRow(xelrow, maxval, pnmType, pngInfoP, pngRaster[row], bgColor, + alphaHandling, totalgamma); - default: - pm_error ("unknown PNG color type: %d", info_ptr->color_type); - } - } - pnm_writepnmrow(ofP, xelrow, info_ptr->width, maxval, pnm_type, FALSE); + pnm_writepnmrow(ofP, xelrow, pngInfoP->width, maxval, pnmType, FALSE); } pnm_freerow (xelrow); } @@ -996,9 +980,9 @@ convertpng(FILE * const ifp, struct cmdlineInfo const cmdline, int * const errorlevelP) { - png_struct *png_ptr; - png_info *info_ptr; - png_byte **png_image; + png_struct * png_ptr; + png_info * info_ptr; + png_byte ** png_image; int pnm_type; pngcolor bgColor; float totalgamma; @@ -1047,14 +1031,14 @@ convertpng(FILE * const ifp, */ dump_png_info(info_ptr); - if (mtime) - show_time (info_ptr); + if (cmdline.time) + show_time(info_ptr); if (tfp) - save_text (info_ptr, tfp); + save_text(info_ptr, tfp); if (info_ptr->valid & PNG_INFO_pHYs) { - float r; - r = (float)info_ptr->x_pixels_per_unit / info_ptr->y_pixels_per_unit; + float const r = + (float)info_ptr->x_pixels_per_unit / info_ptr->y_pixels_per_unit; if (r != 1.0) { pm_message ("warning - non-square pixels; " "to fix do a 'pamscale -%cscale %g'", @@ -1073,7 +1057,7 @@ convertpng(FILE * const ifp, freePngRaster(png_image, info_ptr); - png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp)NULL); + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); } @@ -1091,7 +1075,6 @@ main(int argc, const char *argv[]) { parseCommandLine(argc, argv, &cmdline); verbose = cmdline.verbose; - mtime = cmdline.time; ifP = pm_openr(cmdline.inputFilespec); |