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multicolor text support #42

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473f6cc
initial commit from own version
henlo-birb May 23, 2022
534e1e9
made less janky?
henlo-birb May 29, 2022
f951585
fixed stupid bitmasking
henlo-birb May 29, 2022
adf404b
removed redundant include
henlo-birb May 29, 2022
73f8638
switched to tabs
henlo-birb Jun 29, 2022
c09525d
fixed bugs, cleaned up formatting more
henlo-birb Jun 30, 2022
da286c9
account for using c2d_withcolor and c2d_multicolor at the same time
henlo-birb Jun 30, 2022
7e4611f
fixed typo
henlo-birb Jun 30, 2022
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14 changes: 8 additions & 6 deletions include/c2d/text.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,19 +22,21 @@ typedef struct
float width; ///< Width of the text in pixels, according to 1x scale metrics.
u32 lines; ///< Number of lines in the text.
u32 words; ///< Number of words in the text.
u32 chars; ///< Number of characters (including whitespace) in the text
C2D_Font font; ///< Font used to draw the text, or NULL for system font
} C2D_Text;

enum
{
C2D_AtBaseline = BIT(0), ///< Matches the Y coordinate with the baseline of the font.
C2D_WithColor = BIT(1), ///< Draws text with color. Requires a u32 color value.
C2D_AlignLeft = 0 << 2, ///< Draws text aligned to the left. This is the default.
C2D_AlignRight = 1 << 2, ///< Draws text aligned to the right.
C2D_AlignCenter = 2 << 2, ///< Draws text centered.
C2D_AlignJustified = 3 << 2, ///< Draws text justified. When C2D_WordWrap is not specified, right edge is x + scaleX*text->width. Otherwise, right edge is x + the width specified for those values.
C2D_AlignMask = 3 << 2, ///< Bitmask for alignment values.
C2D_WordWrap = BIT(4), ///< Draws text with wrapping of full words before specified width. Requires a float value, passed after color if C2D_WithColor is specified.
C2D_MultiColor = BIT(2), ///< Draws text with multiple colors. Requires a u32* with values alternating between the index a color starts at and then the new color, and then a u32 with the length of that array. This is similar to coloredtext tables in Love2D.
C2D_AlignLeft = 0 << 3, ///< Draws text aligned to the left. This is the default.
C2D_AlignRight = 1 << 3, ///< Draws text aligned to the right.
C2D_AlignCenter = 2 << 3, ///< Draws text centered.
C2D_AlignJustified = 3 << 3, ///< Draws text justified. When C2D_WordWrap is not specified, right edge is x + scaleX*text->width. Otherwise, right edge is x + the width specified for those values.
C2D_AlignMask = 3 << 3, ///< Bitmask for alignment values.
C2D_WordWrap = BIT(5), ///< Draws text with wrapping of full words before specified width. Requires a float value, passed after color values if C2D_WithColor or C2D_MultiColor is specified.
};

/** @brief Creates a new text buffer.
Expand Down
82 changes: 81 additions & 1 deletion source/text.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ typedef struct C2Di_Glyph_s
{
float left, top, right, bottom;
} texcoord;
u32 charNo;
u32 wordNo;
} C2Di_Glyph;

Expand Down Expand Up @@ -145,9 +146,12 @@ const char* C2D_TextFontParseLine(C2D_Text* text, C2D_Font font, C2D_TextBuf buf
text->begin = buf->glyphCount;
text->width = 0.0f;
u32 wordNum = 0;
u32 charNum = text->chars;

bool lastWasWhitespace = true;
while (buf->glyphCount < buf->glyphBufSize)
{
++charNum;
uint32_t code;
ssize_t units = decode_utf8(&code, p);
if (units == -1)
Expand Down Expand Up @@ -175,6 +179,7 @@ const char* C2D_TextFontParseLine(C2D_Text* text, C2D_Font font, C2D_TextBuf buf
glyph->xPos = text->width + glyphData.xOffset;
glyph->lineNo = lineNo;
glyph->wordNo = wordNum;
glyph->charNo = charNum - 1;
glyph->width = glyphData.width;
glyph->texcoord.left = glyphData.texcoord.left;
glyph->texcoord.top = glyphData.texcoord.top;
Expand All @@ -193,6 +198,7 @@ const char* C2D_TextFontParseLine(C2D_Text* text, C2D_Font font, C2D_TextBuf buf
text->width *= s_textScale;
text->lines = 1;
text->words = wordNum;
text->chars = charNum;
return (const char*)p;
}

Expand All @@ -208,13 +214,16 @@ const char* C2D_TextFontParse(C2D_Text* text, C2D_Font font, C2D_TextBuf buf, co
text->begin = buf->glyphCount;
text->width = 0.0f;
text->words = 0;
text->chars = 0;
text->lines = 0;

for (;;)
{
C2D_Text temp;
temp.chars = text->chars;
str = C2D_TextFontParseLine(&temp, font, buf, str, text->lines++);
text->words += temp.words;
text->chars = temp.chars;
if (temp.width > text->width)
text->width = temp.width;
if (!str || *str != '\n')
Expand Down Expand Up @@ -338,6 +347,9 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
dispY = ceilf(scaleY*fontGetInfo(systemFont)->lineFeed);
}
u32 color = 0xFF000000;
u32* colors = NULL;
u32 lenColors = 0;

float maxWidth = scaleX*text->width;

va_list va;
Expand All @@ -352,6 +364,13 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
}
if (flags & C2D_WithColor)
color = va_arg(va, u32);

if (flags & C2D_MultiColor)
{
colors = va_arg(va, u32*);
lenColors = va_arg(va, u32);
}

if (flags & C2D_WordWrap)
maxWidth = va_arg(va, double); // Passed as float, but varargs promotes to double.

Expand Down Expand Up @@ -384,7 +403,7 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
// And set the new line number based off the last word's
words[i].newLineNumber = words[i-1].newLineNumber + 1;
}
// Otherwise both X offset and new line number should be the same as the last word's
// Otherwise, both X offset and new line number should be the same as the last word's
else
{
words[i].wrapXOffset = words[i-1].wrapXOffset;
Expand All @@ -393,6 +412,7 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
}
}

u32 lastColorIdx = 0;
switch (flags & C2D_AlignMask)
{
case C2D_AlignLeft:
Expand All @@ -413,6 +433,21 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
glyphY = y+dispY*cur->lineNo;
}

if (colors != NULL){
if(cur->charNo >= colors[lastColorIdx] && cur->charNo < colors[lastColorIdx+2]) {
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color = colors[lastColorIdx+1];
}
else{
for(size_t i = 0; i < lenColors; i += 2) {
if (cur->charNo >= colors[i] && (i + 2 >= lenColors || cur->charNo < colors[i+2])) {
color = colors[i+1];
lastColorIdx = i;
break;
}
}
}
}

C2Di_SetTex(cur->sheet);
C2Di_Update();
C2Di_AppendQuad();
Expand Down Expand Up @@ -444,6 +479,21 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
glyphY = y + dispY*cur->lineNo;
}

if (colors != NULL){
if(cur->charNo >= colors[lastColorIdx] && cur->charNo < colors[lastColorIdx+2]) {
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color = colors[lastColorIdx+1];
}
else{
for(size_t i = 0; i < lenColors; i += 2) {
if (cur->charNo >= colors[i] && (i + 2 >= lenColors || cur->charNo < colors[i+2])) {
color = colors[i+1];
lastColorIdx = i;
break;
}
}
}
}

C2Di_SetTex(cur->sheet);
C2Di_Update();
C2Di_AppendQuad();
Expand Down Expand Up @@ -476,6 +526,21 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
glyphY = y + dispY*cur->lineNo;
}

if (colors != NULL){
if(cur->charNo >= colors[lastColorIdx] && cur->charNo < colors[lastColorIdx+2]) {
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color = colors[lastColorIdx+1];
}
else{
for(size_t i = 0; i < lenColors; i += 2) {
if (cur->charNo >= colors[i] && (i + 2 >= lenColors || cur->charNo < colors[i+2])) {
color = colors[i+1];
lastColorIdx = i;
break;
}
}
}
}

C2Di_SetTex(cur->sheet);
C2Di_Update();
C2Di_AppendQuad();
Expand Down Expand Up @@ -548,6 +613,21 @@ void C2D_DrawText(const C2D_Text* text, u32 flags, float x, float y, float z, fl
float glyphX = x + scaleX*wordPositions[consecutiveWordNum].xBegin + scaleX*(cur->xPos - words[consecutiveWordNum].start->xPos) + justifiedLineInfo[words[consecutiveWordNum].newLineNumber].whitespaceWidth*(consecutiveWordNum - justifiedLineInfo[words[consecutiveWordNum].newLineNumber].wordStart);
float glyphY = y + dispY*words[consecutiveWordNum].newLineNumber;

if (colors != NULL){
if(cur->charNo >= colors[lastColorIdx] && cur->charNo < colors[lastColorIdx+2]) {
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color = colors[lastColorIdx+1];
}
else{
for(size_t i = 0; i < lenColors; i += 2) {
if (cur->charNo >= colors[i] && (i + 2 >= lenColors || cur->charNo < colors[i+2])) {
color = colors[i+1];
lastColorIdx = i;
break;
}
}
}
}

C2Di_SetTex(cur->sheet);
C2Di_Update();
C2Di_AppendQuad();
Expand Down