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#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "netpbm/mallocvar.h"
#include "pm.h"
#include "ppmdfont.h"
extern struct ppmd_font ppmd_standardfont;
static const struct ppmd_font * currentFontP = &ppmd_standardfont;
static void
readGlyphHeader(FILE * const ifP,
struct ppmd_glyphHeader * const glyphHeaderP) {
glyphHeaderP->commandCount = fgetc(ifP);
glyphHeaderP->skipBefore = fgetc(ifP);
glyphHeaderP->skipAfter = fgetc(ifP);
}
static void
readGlyphCommand(FILE * const ifP,
struct ppmd_glyphCommand * const glyphCommandP) {
glyphCommandP->verb = fgetc(ifP);
glyphCommandP->x = fgetc(ifP);
glyphCommandP->y = fgetc(ifP);
}
static void
readCharacter(FILE * const ifP,
struct ppmd_glyph * const glyphP) {
unsigned int commandNum;
struct ppmd_glyphCommand * commandList;
readGlyphHeader(ifP, &glyphP->header);
MALLOCARRAY(commandList, glyphP->header.commandCount);
if (commandList == NULL)
pm_error("Insufficient memory to create a %u-command "
"command list.", glyphP->header.commandCount);
for (commandNum = 0;
commandNum < glyphP->header.commandCount;
++commandNum) {
readGlyphCommand(ifP, &commandList[commandNum]);
}
glyphP->commandList = commandList;
}
static void
readFontHeader(FILE * const ifP,
struct ppmd_fontHeader * const fontHeaderP) {
size_t rc;
rc = fread(&fontHeaderP->signature, 1, sizeof(fontHeaderP->signature),
ifP);
if (rc != sizeof(fontHeaderP->signature))
pm_error("Unable to read the header from the font file. "
"errno=%d (%s)", errno, strerror(errno));
fontHeaderP->format = fgetc(ifP);
fontHeaderP->characterCount = fgetc(ifP);
fontHeaderP->firstCodePoint = fgetc(ifP);
}
void
ppmd_set_font(const struct ppmd_font * const newFontP) {
currentFontP = newFontP;
}
const struct ppmd_font *
ppmd_get_font(void) {
return currentFontP;
}
void
ppmd_read_font(FILE * const ifP,
const struct ppmd_font ** const fontPP) {
unsigned int relativeCodePoint;
struct ppmd_glyph * glyphTable;
struct ppmd_font * fontP;
MALLOCVAR(fontP);
if (fontP == NULL)
pm_error("Insufficient memory for font header");
readFontHeader(ifP, &fontP->header);
MALLOCARRAY(glyphTable, fontP->header.characterCount);
if (glyphTable == NULL)
pm_error("Insufficient memory to store %u characters",
fontP->header.characterCount);
for (relativeCodePoint = 0;
relativeCodePoint < fontP->header.characterCount;
++relativeCodePoint) {
readCharacter(ifP, &glyphTable[relativeCodePoint]);
}
fontP->glyphTable = glyphTable;
*fontPP = fontP;
}
void
ppmd_free_font(const struct ppmd_font * const fontP) {
unsigned int relativeCodePoint;
for (relativeCodePoint = 0;
relativeCodePoint < fontP->header.characterCount;
++relativeCodePoint) {
free((void*)fontP->glyphTable[relativeCodePoint].commandList);
}
free((void*)fontP->glyphTable);
free((void*)fontP);
}
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