shithub: choc

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textscreen: Add API to change color palette.

This is possible under DOS as well by writing to the appropriate VGA
registers, and the vanilla setup tool actually does this in earlier
versions to set "Romero Blue".

--- a/textscreen/txt_main.h

+++ b/textscreen/txt_main.h

@@ -149,6 +149,9 @@

 // Update the whole screen

 void TXT_UpdateScreen(void);

+// Set the RGB value for a particular entry in the color palette:

+void TXT_SetColor(txt_color_t color, int r, int g, int b);

+

 // Read a character from the keyboard

 int TXT_GetChar(void);

--- a/textscreen/txt_sdl.c

+++ b/textscreen/txt_sdl.c

@@ -85,7 +85,7 @@

 // Unicode key mapping; see codepage.h.

 static const short code_page_to_unicode[] = CODE_PAGE_TO_UNICODE;

-static SDL_Color ega_colors[] =

+static const SDL_Color ega_colors[] =

 {

     {0x00, 0x00, 0x00, 0xff},          // 0: Black

     {0x00, 0x00, 0xa8, 0xff},          // 1: Blue

@@ -306,6 +306,15 @@

     SDL_FreeSurface(screenbuffer);

     screenbuffer = NULL;

     SDL_QuitSubSystem(SDL_INIT_VIDEO);

+}

+

+void TXT_SetColor(txt_color_t color, int r, int g, int b)

+{

+    SDL_Color c = {r, g, b, 0xff};

+

+    SDL_LockSurface(screenbuffer);

+    SDL_SetPaletteColors(screenbuffer->format->palette, &c, color, 1);

+    SDL_UnlockSurface(screenbuffer);

 }

 unsigned char *TXT_GetScreenData(void)