SCR (Amstrad CPC) file format
- Implements Test_SCR() / Load_SCR() for standard formats pictures - Save .PAL file in Save_SCR()
This commit is contained in:
Thomas Bernard
parent
bf461a8a52
commit
67a1220085
@ -112,6 +112,8 @@ void Load_C64(T_IO_Context *);
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void Save_C64(T_IO_Context *);
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// -- SCR (Amstrad CPC)
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void Test_SCR(T_IO_Context *, FILE *);
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void Load_SCR(T_IO_Context *);
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void Save_SCR(T_IO_Context *);
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// -- CM5 (Amstrad CPC)
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@ -64,6 +64,7 @@ unsigned char mode3interlace(T_IO_Context * context, unsigned char x, unsigned c
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return mode3pixel[Get_pixel(context, x,y) & 3] << 3 | mode3pixel[Get_pixel(context,x+1,y) & 3] << 2;
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}
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///@ingroup cpc
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unsigned char *raw2crtc(T_IO_Context *context, unsigned char mode, unsigned char r9, unsigned long *outSize, unsigned char *r1, unsigned char r12, unsigned char r13)
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{
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unsigned char *outBuffer;
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@ -90,6 +90,7 @@ const T_Format File_formats[] = {
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{FORMAT_ALL_IMAGES, "(all)", NULL, NULL, NULL, 0, 0, 0, "",
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"gif;png;bmp;2bp;pcx;pkm;iff;lbm;ilbm;sham;ham;ham6;ham8;acbm;pic;anim;img;sci;scq;scf;scn;sco;pi1;pc1;cel;neo;"
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"c64;p64;a64;pi;rp;aas;art;dd;iph;ipt;hpc;ocp;koa;koala;fli;bml;cdu;prg;pmg;rpm;"
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"cpc;scr;win;"
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"tga;pnm;xpm;xcf;jpg;jpeg;tif;tiff;ico;ic2;cur;cm5;pph;info;flc;bin;map"},
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{FORMAT_ALL_PALETTES, "(pal)", NULL, NULL, NULL, 1, 0, 0, "", "kcf;pal;gpl"},
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{FORMAT_ALL_FILES, "(*.*)", NULL, NULL, NULL, 0, 0, 0, "", "*"},
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@ -114,7 +115,7 @@ const T_Format File_formats[] = {
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{FORMAT_GPL, " gpl", Test_GPL, Load_GPL, Save_GPL, 1, 0, 0, "gpl", "gpl"},
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{FORMAT_C64, " c64", Test_C64, Load_C64, Save_C64, 0, 1, 0, "c64",
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"c64;p64;a64;pi;rp;aas;art;dd;iph;ipt;hpc;ocp;koa;koala;fli;bml;cdu;prg;pmg;rpm"},
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{FORMAT_SCR, " cpc", NULL, NULL, Save_SCR, 0, 0, 0, "cpc", "cpc;scr"},
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{FORMAT_SCR, " cpc", Test_SCR, Load_SCR, Save_SCR, 0, 0, 0, "scr", "cpc;scr;win"},
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{FORMAT_CM5, " cm5", Test_CM5, Load_CM5, Save_CM5, 0, 0, 1, "cm5", "cm5"},
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{FORMAT_PPH, " pph", Test_PPH, Load_PPH, Save_PPH, 0, 0, 1, "pph", "pph"},
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{FORMAT_XPM, " xpm", NULL, NULL, Save_XPM, 0, 0, 0, "xpm", "xpm"},
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@ -3733,24 +3733,65 @@ void Save_C64(T_IO_Context * context)
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/**
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* Test for SCR file (Amstrad CPC)
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*
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* TODO
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* SCR file format is from "Advanced OCP Art Studio" :
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* http://www.cpcwiki.eu/index.php/Format:Advanced_OCP_Art_Studio_File_Formats
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*
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* For now we check the presence of a valid PAL file.
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* If the PAL file is not there the pixel data may still be valid.
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* The file size depends on the screen resolution.
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* An AMSDOS header would be a good indication but in some cases it may not
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* be there.
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*/
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void Test_SCR(T_IO_Context * context, FILE * file)
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{
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/**
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* Mmh... not sure what we could test. Any idea ?
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* The palette file can be tested, if it exists and have the right size it's
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* ok. But if it's not there the pixel data may still be valid. And we can't
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* use the filesize as this depends on the screen format.
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FILE * pal_file;
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unsigned long pal_size;
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byte mode, color_anim_flag;
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* An AMSDOS header would be a good indication but in some cases it may not
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* be there */
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(void)context; // unused
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(void)file;
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File_error = 1;
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// requires the PAL file
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pal_file = Open_file_read_with_alternate_ext(context, "pal");
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if (pal_file == NULL)
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return;
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pal_size = File_length_file(pal_file);
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if (pal_size == 239+128)
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{
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if (!CPC_check_AMSDOS(pal_file, NULL, NULL))
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{
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fclose(pal_file);
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return;
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}
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fseek(pal_file, 128, SEEK_SET); // right after AMSDOS header
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}
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else if (pal_size != 239)
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{
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fclose(pal_file);
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return;
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}
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if (!Read_byte(pal_file, &mode) || !Read_byte(pal_file, &color_anim_flag))
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{
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fclose(pal_file);
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return;
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}
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GFX2_Log(GFX2_DEBUG, "Test_SCR() mode=%d color animation flag %02X\n", mode, color_anim_flag);
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if (mode <= 2 && (color_anim_flag == 0 || color_anim_flag == 0xff))
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File_error = 0;
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fclose(pal_file);
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}
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/**
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* TODO
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* Load Advanced OCP Art Studio files (Amstrad CPC)
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*
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* Only standard resolution files (Mode 0 160x200, mode 1 320x200 and
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* mode 2 640x200) are supported. The .PAL file presence is required.
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* "MJH" RLE packing is supported.
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*
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* @todo Ask user for screen size (or register values) in order to support
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* non standard resolutions.
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*/
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void Load_SCR(T_IO_Context * context)
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{
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@ -3772,31 +3813,204 @@ void Load_SCR(T_IO_Context * context)
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// All this mess enforces us to load (and unpack if needed) the file to a
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// temporary 32k buffer before actually decoding it.
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FILE * pal_file, * file;
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unsigned long file_size, amsdos_file_size = 0;
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byte mode, color_anim_flag, color_anim_delay;
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byte pal_data[236]; // 12 palettes of 16+1 colors + 16 excluded inks + 16 protected inks
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word width, height = 200;
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byte bpp;
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enum PIXEL_RATIO ratio;
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byte * pixel_data;
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word x, y;
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int i;
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// 1) Seek for a palette
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// 2) If palette found get screenmode from there, else ask user
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// 3) ask user for screen size (or register values)
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// 4) Load color data from palette (if found)
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// 5) Close palette
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// 6) Open the file
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// 7) Run around the screen to untangle the pixeldata
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// 8) Close the file
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(void)context; // unused
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File_error = 1;
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// requires the PAL file
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pal_file = Open_file_read_with_alternate_ext(context, "pal");
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if (pal_file == NULL)
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return;
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file_size = File_length_file(pal_file);
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if (file_size == 239+128)
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{
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if (!CPC_check_AMSDOS(pal_file, NULL, NULL))
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{
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fclose(pal_file);
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return;
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}
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fseek(pal_file, 128, SEEK_SET); // right after AMSDOS header
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}
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if (!Read_byte(pal_file, &mode) || !Read_byte(pal_file, &color_anim_flag)
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|| !Read_byte(pal_file, &color_anim_delay) || !Read_bytes(pal_file, pal_data, 236))
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{
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GFX2_Log(GFX2_WARNING, "Load_SCR() failed to load .PAL file\n");
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fclose(pal_file);
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return;
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}
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fclose(pal_file);
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GFX2_Log(GFX2_DEBUG, "Load_SCR() mode=%d color animation flag=%02X delay=%u\n",
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mode, color_anim_flag, color_anim_delay);
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switch (mode)
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{
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case 0:
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width = 160;
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bpp = 4;
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ratio = PIXEL_WIDE;
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break;
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case 1:
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width = 320;
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bpp = 2;
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ratio = PIXEL_SIMPLE;
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break;
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case 2:
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width = 640;
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bpp = 1;
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ratio = PIXEL_TALL;
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break;
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default:
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return; // unsupported
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}
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if (Config.Clear_palette)
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memset(context->Palette,0,sizeof(T_Palette));
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// Setup the palette (amstrad hardware palette)
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CPC_set_HW_palette(context->Palette + 0x40);
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// Set the palette for this picture
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for (i = 0; i < 16; i++)
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context->Palette[i] = context->Palette[pal_data[12*i]];
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file = Open_file_read(context);
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if (file == NULL)
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return;
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file_size = File_length_file(file);
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if (CPC_check_AMSDOS(file, NULL, &amsdos_file_size))
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{
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if (file_size < (amsdos_file_size + 128))
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{
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GFX2_Log(GFX2_ERROR, "Load_SCR() mismatch in file size. AMSDOS file size %lu, should be %lu\n", amsdos_file_size, file_size - 128);
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fclose(file);
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return;
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}
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else if (file_size > (amsdos_file_size + 128))
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GFX2_Log(GFX2_INFO, "Load_SCR() %lu extra bytes at end of file\n", file_size - 128 - amsdos_file_size);
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fseek(file, 128, SEEK_SET); // right after AMSDOS header
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}
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else
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fseek(file, 0, SEEK_SET);
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Pre_load(context, width, height, file_size, FORMAT_SCR, ratio, bpp);
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if(amsdos_file_size != 0)
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file_size = amsdos_file_size;
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pixel_data = malloc(16384);
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if (file_size >= 16336 && file_size <= 16384)
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Read_bytes(file, pixel_data, file_size);
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else
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{
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byte sig[3];
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word block_length;
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// MJH packed format
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i = 0;
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do
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{
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if (!Read_bytes(file, sig, 3) || !Read_word_le(file, &block_length))
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break;
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if (0 != memcmp(sig, "MJH", 3))
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break;
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GFX2_Log(GFX2_DEBUG, " %.3s %u\n", sig, block_length);
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file_size -= 5;
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while (block_length > 0)
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{
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byte code;
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if (!Read_byte(file, &code))
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break;
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file_size--;
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if (code == 1)
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{
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byte repeat, value;
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if (!Read_byte(file, &repeat) || !Read_byte(file, &value))
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break;
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file_size -= 2;
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do
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{
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pixel_data[i++] = value;
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block_length--;
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}
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while(--repeat != 0);
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}
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else
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{
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pixel_data[i++] = code;
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block_length--;
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}
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}
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}
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while(file_size > 0 && i < 16384);
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}
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fclose(file);
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for (y = 0; y < height; y++)
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{
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const byte * line;
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line = pixel_data + ((y & 7) << 11) + ((y >> 3) * 80);
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x = 0;
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for (i = 0; i < 80; i++)
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{
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byte pixels = line[i];
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switch (mode)
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{
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case 0:
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Set_pixel(context, x++, y, (pixels & 0x80) >> 7 | (pixels & 0x08) >> 2 | (pixels & 0x20) >> 3 | (pixels & 0x02) << 2);
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Set_pixel(context, x++, y, (pixels & 0x40) >> 6 | (pixels & 0x04) >> 1 | (pixels & 0x10) >> 2 | (pixels & 0x01) << 3);
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break;
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case 1:
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do {
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// upper nibble is 4 lower color bits, lower nibble is 4 upper color bits
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Set_pixel(context, x++, y, (pixels & 0x80) >> 7 | (pixels & 0x08) >> 2);
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pixels <<= 1;
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}
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while ((x & 3) != 0);
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break;
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case 2:
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do {
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Set_pixel(context, x++, y, (pixels & 0x80) >> 7);
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pixels <<= 1;
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}
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while ((x & 7) != 0);
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}
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}
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}
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free(pixel_data);
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File_error = 0;
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}
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/**
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* Save Amstrad SCR file
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*
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* guess mode from aspect ratio :
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* - normal pixels are mode 1
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* - wide pixels are mode 0
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* - tall pixels are mode 2
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*
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* Mode and palette are stored in a .PAL file.
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*
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* The picture color index should be 0-15,
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* The CPC Hardware palette is expected to be set (indexes 64 to 95)
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*
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* @todo Add possibility to set R9, R12, R13 values
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* @todo Add OCP packing support
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* @todo Add possibility to include AMSDOS header, with proper loading
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* address guessed from r12/r13 values.
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*/
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void Save_SCR(T_IO_Context * context)
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{
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// TODO : Add possibility to set R9, R12, R13 values
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// TODO : Add OCP packing support
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// TODO : Add possibility to include AMSDOS header, with proper loading
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// address guessed from r12/r13 values.
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int i, j;
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unsigned char* output;
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unsigned long outsize;
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unsigned char r1;
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unsigned long outsize = 0;
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unsigned char r1 = 0;
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int cpc_mode;
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FILE* file;
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@ -3817,16 +4031,65 @@ void Save_SCR(T_IO_Context * context)
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break;
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}
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output = raw2crtc(context, cpc_mode, 7, &outsize, &r1, 0x0C, 0);
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file = Open_file_write(context);
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Write_bytes(file, output, outsize);
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file = Open_file_write_with_alternate_ext(context, "pal");
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if (file == NULL)
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return;
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if (!Write_byte(file, cpc_mode) || !Write_byte(file, 0) || !Write_byte(file, 0))
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{
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fclose(file);
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return;
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}
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for (i = 0; i < 16; i++)
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{
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// search for the color in the HW palette (0x40-0x5F)
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byte index = 0x40;
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while ((index < 0x60) &&
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(0 != memcmp(context->Palette + i, context->Palette + index, sizeof(T_Components))))
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index++;
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if (index >= 0x60)
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{
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GFX2_Log(GFX2_WARNING, "Save_SCR() color #%i not found in CPC HW palette.\n", i);
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index = 0x54 - i; // default
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}
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for (j = 0; j < 12; j++) // write the same color for the 12 frames
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{
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Write_byte(file, index);
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}
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}
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// border
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for (j = 0; j < 12; j++)
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{
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Write_byte(file, 0x54); // black
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}
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// excluded inks
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for (i = 0; i < 16; i++)
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{
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Write_byte(file, 0);
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}
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// protected inks
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for (i = 0; i < 16; i++)
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{
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Write_byte(file, 0);
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}
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fclose(file);
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free (output);
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output = NULL;
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output = raw2crtc(context, cpc_mode, 7, &outsize, &r1, 0x0C, 0);
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GFX2_Log(GFX2_DEBUG, "Save_SCR() output=%p outsize=%lu r1=$%02X\n", output, outsize, r1);
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if (output == NULL)
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return;
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file = Open_file_write(context);
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if (file == NULL)
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File_error = 1;
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else
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{
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File_error = 0;
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if (!Write_bytes(file, output, outsize))
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File_error = 1;
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fclose(file);
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}
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free (output);
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}
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/**
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35
src/oldies.c
35
src/oldies.c
@ -504,6 +504,41 @@ void CPC_set_HW_palette(T_Components * palette)
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memcpy(palette, CPC_Hw_Palette, sizeof(CPC_Hw_Palette));
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}
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int CPC_check_AMSDOS(FILE * file, word * loading_address, unsigned long * file_length)
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{
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int i;
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byte data[128];
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word checksum = 0;
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fseek(file, 0, SEEK_SET);
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if (!Read_bytes(file, data, 128))
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return 0;
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for (i = 1; i <= 11; i++) // check filename and extension
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{
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if (data[i] < ' ' || data[i] >= 0x7F)
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return 0;
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}
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for (i = 0; i < 67; i++)
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checksum += (word)data[i];
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if (checksum != (data[67] | (data[68] << 8)))
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{
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GFX2_Log(GFX2_INFO, "AMSDOS header checksum mismatch %04X != %04X\n",
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checksum, data[67] | (data[68] << 8));
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return 0;
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}
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GFX2_Log(GFX2_DEBUG, "AMSDOS : user=%02X %.8s.%.3s %d %u(%u) bytes, load at $%04X checksum $%04X\n",
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data[0],
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(char *)(data + 1), (char *)(data + 9), data[18],
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data[24] | (data[25] << 8), data[64] | (data[65] << 8) | (data[66] << 16),
|
||||
data[26] | (data[27] << 8), checksum);
|
||||
if (loading_address)
|
||||
*loading_address = data[26] | (data[27] << 8);
|
||||
if (file_length)
|
||||
*file_length = data[64] | (data[65] << 8) | (data[66] << 16); // 24bit size
|
||||
// *file_length = data[24] | (data[25] << 8); // 16bit size
|
||||
return 1;
|
||||
}
|
||||
|
||||
int DECB_Check_binary_file(FILE * f)
|
||||
{
|
||||
byte code;
|
||||
|
||||
13
src/oldies.h
13
src/oldies.h
@ -73,6 +73,19 @@ void ZX_Spectrum_set_palette(T_Components * palette);
|
||||
*/
|
||||
void CPC_set_HW_palette(T_Components * palette);
|
||||
|
||||
/**
|
||||
* Check AMSDOS header
|
||||
*
|
||||
* see http://www.cpcwiki.eu/index.php/AMSDOS_Header
|
||||
*
|
||||
* @param[in] file an open file
|
||||
* @param[out] loading_address the loading address from the header
|
||||
* @param[out] file_length the file length written in the header
|
||||
* @return 0 if the file does not contain a valid AMSDOS header
|
||||
* @return 1 if it does.
|
||||
*/
|
||||
int CPC_check_AMSDOS(FILE * file, word * loading_address, unsigned long * file_length);
|
||||
|
||||
/** @}*/
|
||||
|
||||
/** @defgroup decb DECB binary format
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user