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Move viewport functions. 

Move viewportChange(), getCleanDirtyReset(), absX() and absY() to the
public API section. Also add some function comments.
This commit is contained in:
Joel Martin 2011-09-26 17:09:29 -05:00
parent 490d471c53
commit 7cd6118ce5
1 changed files with 31 additions and 26 deletions
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57
include/display.js
View File

@ -182,6 +182,26 @@ rescale = function(factor) {
c.style[tp] = "scale(" + conf.scale + ") translate(-" + x + "px, -" + y + "px)";
};
setFillColor = function(color) {
var rgb, newStyle;
if (conf.true_color) {
rgb = color;
} else {
rgb = conf.colourMap[color[0]];
}
newStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
if (newStyle !== c_prevStyle) {
c_ctx.fillStyle = newStyle;
c_prevStyle = newStyle;
}
};
//
// Public API interface functions
//
// Shift and/or resize the visible viewport
that.viewportChange = function(deltaX, deltaY, width, height) {
var c = conf.target, v = viewport, cr = cleanRect,
saveImg = null, saveStyle, x1, y1, vx2, vy2, w, h;
@ -314,6 +334,12 @@ that.viewportChange = function(deltaX, deltaY, width, height) {
c_ctx.fillStyle = saveStyle;
};
// Return a map of clean and dirty areas of the viewport and reset the
// tracking of clean and dirty areas.
//
// Returns: {'cleanBox': {'x': x, 'y': y, 'w': w, 'h': h},
// 'dirtyBoxes': [{'x': x, 'y': y, 'w': w, 'h': h}, ...]}
that.getCleanDirtyReset = function() {
var v = viewport, c = cleanRect, cleanBox, dirtyBoxes = [],
vx2 = v.x + v.w - 1, vy2 = v.y + v.h - 1;
@ -357,6 +383,7 @@ that.getCleanDirtyReset = function() {
return {'cleanBox': cleanBox, 'dirtyBoxes': dirtyBoxes};
};
// Translate viewport coordinates to absolute coordinates
that.absX = function(x) {
return x + viewport.x;
}
@ -365,25 +392,6 @@ that.absY = function(y) {
}
setFillColor = function(color) {
var rgb, newStyle;
if (conf.true_color) {
rgb = color;
} else {
rgb = conf.colourMap[color[0]];
}
newStyle = "rgb(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ")";
if (newStyle !== c_prevStyle) {
c_ctx.fillStyle = newStyle;
c_prevStyle = newStyle;
}
};
//
// Public API interface functions
//
that.resize = function(width, height) {
c_prevStyle = "";
@ -419,13 +427,8 @@ that.copyImage = function(old_x, old_y, new_x, new_y, w, h) {
c_ctx.drawImage(conf.target, x1, y1, w, h, x2, y2, w, h);
};
/*
* Tile rendering functions optimized for rendering engines.
*
* - In Chrome/webkit, Javascript image data array manipulations are
* faster than direct Canvas fillStyle, fillRect rendering. In
* gecko, Javascript array handling is much slower.
*/
// Start updating a tile
that.startTile = function(x, y, width, height, color) {
var data, rgb, red, green, blue, i;
tile_x = x;
@ -456,6 +459,7 @@ that.startTile = function(x, y, width, height, color) {
}
};
// Update sub-rectangle of the current tile
that.subTile = function(x, y, w, h, color) {
var data, p, rgb, red, green, blue, width, j, i, xend, yend;
if (conf.prefer_js) {
@ -485,6 +489,7 @@ that.subTile = function(x, y, w, h, color) {
}
};
// Draw the current tile to the screen
that.finishTile = function() {
if (conf.prefer_js) {
c_ctx.putImageData(tile, tile_x - viewport.x, tile_y - viewport.y)