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(svn r14027) -Codechange: Document a bit the DoDrawString function while removing yet som more magic numbers and one "false" colour

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This commit is contained in:
belugas 2008-08-09 02:11:46 +00:00
parent 788b625553
commit e3ea3c8fbe
3 changed files with 40 additions and 30 deletions
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59
src/gfx.cpp
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@ -627,7 +627,7 @@ void DrawStringMultiCenter(int x, int y, StringID str, int maxw)
for (;;) {
w = GetStringBoundingBox(src).width;
DoDrawString(src, x - (w >> 1), y, 0xFE);
DoDrawString(src, x - (w >> 1), y, TC_FROMSTRING, false);
_cur_fontsize = _last_fontsize;
for (;;) {
@ -677,7 +677,7 @@ uint DrawStringMultiLine(int x, int y, StringID str, int maxw, int maxh)
src = buffer;
for (;;) {
DoDrawString(src, x, y, 0xFE);
DoDrawString(src, x, y, TC_FROMSTRING, false);
_cur_fontsize = _last_fontsize;
for (;;) {
@ -762,40 +762,49 @@ void DrawCharCentered(WChar c, int x, int y, uint16 real_color)
GfxMainBlitter(GetGlyph(size, c), x - w / 2, y, BM_COLOUR_REMAP);
}
/** Draw a string at the given coordinates with the given colour
/** Draw a string at the given coordinates with the given colour.
* While drawing the string, parse it in case some formatting is specified,
* like new colour, new size or even positionning.
* @param string The string to draw
* @param x Offset from left side of the screen, if negative offset from the right side
* @param y Offset from top side of the screen, if negative offset from the bottom
* @param real_color Colour of the string, see _string_colormap in
* @param real_colour Colour of the string, see _string_colormap in
* table/palettes.h or docs/ottd-colourtext-palette.png or the enum TextColour in gfx_type.h
* @return the x-coordinates where the drawing has finished. If nothing is drawn
* the originally passed x-coordinate is returned */
int DoDrawString(const char *string, int x, int y, uint16 real_color)
* @param multiline_skipping By default, always test the available space where to draw the string.
When in multipline drawing, it would already be done,
so no need to re-perform the same kind (more or less) of verifications.
It's not only an optimisation, it's also a way to ensures the string will be parsed
* @return the x-coordinates where the drawing has finished.
* If nothing is drawn, the originally passed x-coordinate is returned
*/
int DoDrawString(const char *string, int x, int y, uint16 real_colour, bool multiline_skipping)
{
DrawPixelInfo *dpi = _cur_dpi;
FontSize size = _cur_fontsize;
WChar c;
int xo = x, yo = y;
byte color = real_color & 0xFF;
byte previous_color = color;
byte colour = real_colour & 0xFF; // extract the 8 bits colour index that is required for the mapping
byte previous_colour = colour;
if (color != 0xFE) {
if (!multiline_skipping) {
/* in "mode multiline", the available space have been verified. Not in regular one.
* So if the string cannot be drawn, return the original start to say so.*/
if (x >= dpi->left + dpi->width ||
x + _screen.width * 2 <= dpi->left ||
y >= dpi->top + dpi->height ||
y + _screen.height <= dpi->top)
return x;
if (color != 0xFF) {
switch_color:;
if (real_color & IS_PALETTE_COLOR) {
_string_colorremap[1] = color;
if (colour != TC_INVALID) { // the invalid colour flag test should not really occur. But better be safe
switch_colour:;
if (real_colour & IS_PALETTE_COLOR) {
_string_colorremap[1] = colour;
_string_colorremap[2] = _use_dos_palette ? 1 : 215;
} else {
uint palette = _use_dos_palette ? 1 : 0;
_string_colorremap[1] = _string_colormap[palette][color].text;
_string_colorremap[2] = _string_colormap[palette][color].shadow;
_string_colorremap[1] = _string_colormap[palette][colour].text;
_string_colorremap[2] = _string_colormap[palette][colour].shadow;
}
_color_remap_ptr = _string_colorremap;
}
@ -815,7 +824,7 @@ skip_char:;
skip_cont:;
if (c == 0) {
_last_fontsize = size;
return x;
return x; // Nothing more to draw, get out. And here is the new x position
}
if (IsPrintable(c)) {
if (x >= dpi->left + dpi->width) goto skip_char;
@ -824,16 +833,16 @@ skip_cont:;
}
x += GetCharacterWidth(size, c);
} else if (c == '\n') { // newline = {}
x = xo;
x = xo; // We require a new line, so the x coordinate is reset
y += GetCharacterHeight(size);
goto check_bounds;
} else if (c >= SCC_BLUE && c <= SCC_BLACK) { // change color?
previous_color = color;
color = (byte)(c - SCC_BLUE);
goto switch_color;
} else if (c == SCC_PREVIOUS_COLOUR) { // revert to the previous color
Swap(color, previous_color);
goto switch_color;
} else if (c >= SCC_BLUE && c <= SCC_BLACK) { // change colour?
previous_colour = colour;
colour = (byte)(c - SCC_BLUE);
goto switch_colour;
} else if (c == SCC_PREVIOUS_COLOUR) { // revert to the previous colour
Swap(colour, previous_colour);
goto switch_colour;
} else if (c == SCC_SETX) { // {SETX}
x = xo + (byte)*string++;
} else if (c == SCC_SETXY) {// {SETXY}

2
src/gfx_func.h
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@ -87,7 +87,7 @@ int DoDrawStringCentered(int x, int y, const char *str, uint16 color);
int DrawString(int x, int y, StringID str, uint16 color);
int DrawStringTruncated(int x, int y, StringID str, uint16 color, uint maxw);
int DoDrawString(const char *string, int x, int y, uint16 color);
int DoDrawString(const char *string, int x, int y, uint16 real_colour, bool multiline_skipping = true);
int DoDrawStringTruncated(const char *str, int x, int y, uint16 color, uint maxw);
void DrawStringCenterUnderline(int x, int y, StringID str, uint16 color);

1
src/gfx_type.h
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@ -214,6 +214,7 @@ enum TextColour {
TC_GREY = 0x0E,
TC_DARK_BLUE = 0x0F,
TC_BLACK = 0x10,
TC_INVALID = 0xFF,
};
/** Defines a few values that are related to animations using palette changes */