xpm.cxx

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// Scintilla source code edit control
/** @file XPM.cxx
 ** Define a class that holds data in the X Pixmap (XPM) format.
 **/
// Copyright 1998-2003 by Neil Hodgson <[e-mail]>
// The License.txt file describes the conditions under which this software may be distributed.

#include <string.h>
#include <stdlib.h>

#include "Platform.h"

#include "XPM.h"

static const char *NextField(const char *s) {
	// In case there are leading spaces in the string
	while (*s && *s == ' ') {
		s++;
	}
	while (*s && *s != ' ') {
		s++;
	}
	while (*s && *s == ' ') {
		s++;
	}
	return s;
}

// Data lines in XPM can be terminated either with NUL or "
static size_t MeasureLength(const char *s) {
	size_t i = 0;
	while (s[i] && (s[i] != '\"'))
		i++;
	return i;
}

ColourAllocated XPM::ColourFromCode(int ch) {
	return colourCodeTable[ch]->allocated;
#ifdef SLOW
	for (int i=0; i<nColours; i++) {
		if (codes[i] == ch) {
			return colours[i].allocated;
		}
	}
	return colours[0].allocated;
#endif
}

void XPM::FillRun(Surface *surface, int code, int startX, int y, int x) {
	if ((code != codeTransparent) && (startX != x)) {
		PRectangle rc(startX, y, x, y+1);
		surface->FillRectangle(rc, ColourFromCode(code));
	}
}

XPM::XPM(const char *textForm) :
	data(0), codes(0), colours(0), lines(0) {
	Init(textForm);
}

XPM::XPM(const char * const *linesForm) :
	data(0), codes(0), colours(0), lines(0) {
	Init(linesForm);
}

XPM::~XPM() {
	Clear();
}

void XPM::Init(const char *textForm) {
	Clear();
	// Test done is two parts to avoid possibility of overstepping the memory
	// if memcmp implemented strangely. Must be 4 bytes at least at destination.
	if ((0 == memcmp(textForm, "/* X", 4)) && (0 == memcmp(textForm, "/* XPM */", 9))) {
		// Build the lines form out of the text form
		const char **linesForm = LinesFormFromTextForm(textForm);
		if (linesForm != 0) {
			Init(linesForm);
			delete []linesForm;
		}
	} else {
		// It is really in line form
		Init(reinterpret_cast<const char * const *>(textForm));
	}
}

void XPM::Init(const char * const *linesForm) {
	Clear();
	height = 1;
	width = 1;
	nColours = 1;
	data = NULL;
	codeTransparent = ' ';
	codes = NULL;
	colours = NULL;
	lines = NULL;
	if (!linesForm)
		return;

	const char *line0 = linesForm[0];
	width = atoi(line0);
	line0 = NextField(line0);
	height = atoi(line0);
	line0 = NextField(line0);
	nColours = atoi(line0);
	line0 = NextField(line0);
	if (atoi(line0) != 1) {
		// Only one char per pixel is supported
		return;
	}
	codes = new char[nColours];
	colours = new ColourPair[nColours];

	int strings = 1+height+nColours;
	lines = new char *[strings];
	size_t allocation = 0;
	for (int i=0; i<strings; i++) {
		allocation += MeasureLength(linesForm[i]) + 1;
	}
	data = new char[allocation];
	char *nextBit = data;
	for (int j=0; j<strings; j++) {
		lines[j] = nextBit;
		size_t len = MeasureLength(linesForm[j]);
		memcpy(nextBit, linesForm[j], len);
		nextBit += len;
		*nextBit++ = '\0';
	}

	for (int code=0; code<256; code++) {
		colourCodeTable[code] = 0;
	}

	for (int c=0; c<nColours; c++) {
		const char *colourDef = linesForm[c+1];
		codes[c] = colourDef[0];
		colourDef += 4;
		if (*colourDef == '#') {
			colours[c].desired.Set(colourDef);
		} else {
			colours[c].desired = ColourDesired(0xff, 0xff, 0xff);
			codeTransparent = codes[c];
		}
		colourCodeTable[static_cast<unsigned char>(codes[c])] = &(colours[c]);
	}
}

void XPM::Clear() {
	delete []data;
	data = 0;
	delete []codes;
	codes = 0;
	delete []colours;
	colours = 0;
	delete []lines;
	lines = 0;
}

void XPM::RefreshColourPalette(Palette &pal, bool want) {
	if (!data || !codes || !colours || !lines) {
		return;
	}
	for (int i=0; i<nColours; i++) {
		pal.WantFind(colours[i], want);
	}
}

void XPM::CopyDesiredColours() {
	if (!data || !codes || !colours || !lines) {
		return;
	}
	for (int i=0; i<nColours; i++) {
		colours[i].Copy();
	}
}

void XPM::Draw(Surface *surface, PRectangle &rc) {
	if (!data || !codes || !colours || !lines) {
		return;
	}
	// Centre the pixmap
	int startY = rc.top + (rc.Height() - height) / 2;
	int startX = rc.left + (rc.Width() - width) / 2;
	for (int y=0;y<height;y++) {
		int prevCode = 0;
		int xStartRun = 0;
		for (int x=0; x<width; x++) {
			int code = lines[y+nColours+1][x];
			if (code != prevCode) {
				FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + x);
				xStartRun = x;
				prevCode = code;
			}
		}
		FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + width);
	}
}

const char **XPM::LinesFormFromTextForm(const char *textForm) {
	// Build the lines form out of the text form
	const char **linesForm = 0;
	int countQuotes = 0;
	int strings=1;
	int j=0;
	for (; countQuotes < (2*strings) && textForm[j] != '\0'; j++) {
		if (textForm[j] == '\"') {
			if (countQuotes == 0) {
				// First field: width, height, number of colors, chars per pixel
				const char *line0 = textForm + j + 1;
				// Skip width
				line0 = NextField(line0);
				// Add 1 line for each pixel of height
				strings += atoi(line0);
				line0 = NextField(line0);
				// Add 1 line for each colour
				strings += atoi(line0);
				linesForm = new const char *[strings];
				if (linesForm == 0) {
					break;	// Memory error!
				}
			}
			if (countQuotes / 2 >= strings) {
				break;	// Bad height or number of colors!
			}
			if ((countQuotes & 1) == 0) {
				linesForm[countQuotes / 2] = textForm + j + 1;
			}
			countQuotes++;
		}
	}
	if (textForm[j] == '\0' || countQuotes / 2 > strings) {
		// Malformed XPM! Height + number of colors too high or too low
		delete []linesForm;
		linesForm = 0;
	}
	return linesForm;
}

// In future, may want to minimize search time by sorting and using a binary search.

XPMSet::XPMSet() : set(0), len(0), maximum(0), height(-1), width(-1) {
}

XPMSet::~XPMSet() {
	Clear();
}

void XPMSet::Clear() {
	for (int i = 0; i < len; i++) {
		delete set[i];
	}
	delete []set;
	set = 0;
	len = 0;
	maximum = 0;
	height = -1;
	width = -1;
}

void XPMSet::Add(int id, const char *textForm) {
	// Invalidate cached dimensions
	height = -1;
	width = -1;

	// Replace if this id already present
	for (int i = 0; i < len; i++) {
		if (set[i]->GetId() == id) {
			set[i]->Init(textForm);
			set[i]->CopyDesiredColours();
			return;
		}
	}

	// Not present, so add to end
	XPM *pxpm = new XPM(textForm);
	if (pxpm) {
		pxpm->SetId(id);
		pxpm->CopyDesiredColours();
		if (len == maximum) {
			maximum += 64;
			XPM **setNew = new XPM *[maximum];
			for (int i = 0; i < len; i++) {
				setNew[i] = set[i];
			}
			delete []set;
			set = setNew;
		}
		set[len] = pxpm;
		len++;
	}
}

XPM *XPMSet::Get(int id) {
	for (int i = 0; i < len; i++) {
		if (set[i]->GetId() == id) {
			return set[i];
		}
	}
	return 0;
}

int XPMSet::GetHeight() {
	if (height < 0) {
		for (int i = 0; i < len; i++) {
			if (height < set[i]->GetHeight()) {
				height = set[i]->GetHeight();
			}
		}
	}
	return (height > 0) ? height : 0;
}

int XPMSet::GetWidth() {
	if (width < 0) {
		for (int i = 0; i < len; i++) {
			if (width < set[i]->GetWidth()) {
				width = set[i]->GetWidth();
			}
		}
	}
	return (width > 0) ? width : 0;
}