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Implement a more generic "rasters" mode for CPC

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This is similar to mode 5, but with less constraints:
- All inks can have split rasters
- Split rasters have a min width of 32 pixels

Note that this is nowhere near enough to make sure the image will be
renderable (number of colors should be limited, unless there is a span
without rasters allowing to reload registers with new colors, and
moving from one pen to another also has a cost). The goal is to offer no
over-restriction (everything that can be shown on the real machine is
drawable). Additional constraints may be checked from a lua script that
will generate the code and data for displaying the picture.
This commit is contained in:
Adrien Destugues 2018-06-29 11:02:34 +02:00
parent 1d71a0759f
commit 9d46d1e90f
6 changed files with 138 additions and 59 deletions
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143
src/brush.c
View File

@ -120,7 +120,8 @@ void Display_paintbrush(short x,short y,byte color)
if (Mouse_K) // pas de curseur si on est en preview et
return; // en train de cliquer
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5 && Main.current_layer < 4)
if ((Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5
|| Main.backups->Pages->Image_mode == IMAGE_MODE_RASTER) && Main.current_layer < 4)
{
goto single_pixel;
}
@ -284,7 +285,8 @@ void Draw_paintbrush(short x,short y,byte color)
int position;
byte old_color;
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5 && Main.current_layer < 4)
if ((Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5
|| Main.backups->Pages->Image_mode == IMAGE_MODE_RASTER) && Main.current_layer < 4)
{
// Flood-fill the enclosing area
if (x<Main.image_width && y<Main.image_height && x>= 0 && y >= 0
@ -296,40 +298,109 @@ void Draw_paintbrush(short x,short y,byte color)
short min_x,width,min_y,height;
short xx,yy;
// determine area
switch(Main.current_layer)
{
case 0:
default:
// Full layer
min_x=0;
min_y=0;
width=Main.image_width;
height=Main.image_height;
break;
case 1:
case 2:
// Line
min_x=0;
min_y=y;
width=Main.image_width;
height=1;
break;
case 3:
// Segment
min_x=x / 48 * 48;
min_y=y;
width=48;
height=1;
break;
//case 4:
// // 8x8
// min_x=x / 8 * 8;
// min_y=y / 8 * 8;
// width=8;
// height=8;
// break;
}
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5)
{
// determine area
switch(Main.current_layer)
{
case 0:
default:
// Full layer
min_x=0;
min_y=0;
width=Main.image_width;
height=Main.image_height;
break;
case 1:
case 2:
// Line
min_x=0;
min_y=y;
width=Main.image_width;
height=1;
break;
case 3:
// Segment
min_x=x / 48 * 48;
min_y=y;
width=48;
height=1;
break;
}
} else {
int prev_x;
// Raster mode
// No matter what, you can always edit only 1 line at a time here, and you will always
// draw on "nops" boundaries (8 pixels in mode 1)
height=1;
min_y=y;
min_x=x / 8 * 8;
width = 8;
// ????????
// ^
// A
// First look for the previous span to see if it is the same color
prev_x = min_x - 8;
old_color = Read_pixel_from_current_screen(prev_x, y);
if (old_color == color) {
// aaaA????
// ^
// A
// We are just making the previous span larger
width = 8;
while ((min_x >= 0) && (width < 32)
&& (Read_pixel_from_current_screen(min_x, y) == color))
{
min_x -= 8;
width += 8;
}
} else {
// ???B????
// ^
// A
// We are creating a new span. We need to check if the previous span is still large
// enough to be allowed. If it is less than 32 pixels, there is no way to render it
// on the real hardware (this is the time the OUT instruction to change the palette
// needs)
while ((min_x - prev_x < 48)
&& (prev_x <= 0 || old_color == Read_pixel_from_current_screen(prev_x, y)))
{
prev_x -= 8;
}
prev_x += 8;
// CBBB????
// p ^
// A
// The previous span is too small, so eat it
if (min_x - prev_x < 32) {
width += min_x - prev_x;
min_x = prev_x;
}
if (width < 32)
width = 32;
}
// Now, we also need to check if the next span is still large enough, as we are going to
// remove 8 pixels from it. If it is not, we just replace it with the current color and
// let the user figure out how to reinsert it without breaking everything.
prev_x = min_x + width;
old_color = Read_pixel_from_current_screen(prev_x, y);
if (old_color != color) {
while ((prev_x - (min_x + width) < 40)
&& (prev_x > Main.image_width || old_color == Read_pixel_from_current_screen(prev_x, y)))
{
prev_x += 8;
}
if (prev_x - (min_x + width) < 32)
width = prev_x - min_x;
}
}
// Clip the bottom edge.
// (Necessary if image height is not a multiple)
if (min_y+height>=Main.image_height)

16
src/buttons_effects.c
View File

@ -180,19 +180,26 @@ void Button_Constraint_mode(void)
if (Selected_Constraint_Mode <= IMAGE_MODE_ANIMATION)
Selected_Constraint_Mode = IMAGE_MODE_EGX;
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5)
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5 && (Main.image_width%48))
{
Verbose_message("Error!", "Emulation of Amstrad CPC's Mode5 can only be used on an image whose width is a multiple of 48.");
return;
}
if (Selected_Constraint_Mode == IMAGE_MODE_MODE5 || Selected_Constraint_Mode == IMAGE_MODE_RASTER)
{
/* TODO it would be great to auto-create extra layers */
if (Main.backups->Pages->Image_mode != IMAGE_MODE_LAYERED ||
Main.backups->Pages->Nb_layers!=5 || (Main.image_width%48))
Main.backups->Pages->Nb_layers!=5)
{
Verbose_message("Error!", "This emulation of Amstrad CPC's Mode5 can only be used on a 5-layer image whose width is a multiple of 48.");
Verbose_message("Error!", "Emulation of Amstrad CPC's rasters requires a 5-layer image.");
return;
}
for (pixel=0; pixel < Main.image_width*Main.image_height; pixel++)
{
if (Main.backups->Pages->Image[4].Pixels[pixel]>3)
{
Verbose_message("Error!", "This emulation of Amstrad CPC's Mode5 needs all pixels of layer 5 to use colors 0-3.");
Verbose_message("Error!", "Emulation of Amstrad CPC's rasters needs all pixels of layer 5 to use colors 0-3.");
return;
}
}
@ -220,6 +227,7 @@ void Button_Constraint_menu(void)
{IMAGE_MODE_EGX, "EGX (CPC)"},
{IMAGE_MODE_EGX2, "EGX2 (CPC)"},
{IMAGE_MODE_MODE5, "Mode 5 (CPC)"},
{IMAGE_MODE_RASTER, "Rasters (CPC)"},
};
Open_window(154,79,"8-bit constraints");

1
src/const.h
View File

@ -614,6 +614,7 @@ enum IMAGE_MODES
IMAGE_MODE_EGX, ///< CPC EGX
IMAGE_MODE_EGX2, ///< CPC EGX2
IMAGE_MODE_MODE5, ///< CPC mode 5
IMAGE_MODE_RASTER, ///< CPC generic rasters
};
/// Circle / Ellipse Modes

7
src/graph.c
View File

@ -3213,7 +3213,8 @@ byte Read_pixel_from_current_screen (word x,word y)
return *((y)*Main.image_width+(x)+Main.backups->Pages->Image[Main.current_layer].Pixels);
}
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5)
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5
|| Main.backups->Pages->Image_mode == IMAGE_MODE_RASTER)
if (Main.current_layer==4)
return *(Main.backups->Pages->Image[Main.current_layer].Pixels + x+y*Main.image_width);
@ -3632,7 +3633,7 @@ void Update_pixel_renderer(void)
Pixel_in_current_screen = Pixel_in_screen_zx;
Pixel_in_current_screen_with_preview = Pixel_in_screen_zx_with_preview;
}
// Implicit else : Image_mode must be IMAGE_MODE_MODE5
// Implicit else : Image_mode must be IMAGE_MODE_MODE5 or IMAGE_MODE_RASTER
else if ( Main.current_layer == 4)
{
// overlay
@ -3647,7 +3648,7 @@ void Update_pixel_renderer(void)
}
else
{
// layered (again, for layers > 4 in MODE5)
// layered (again, for layers > 4 in MODE5 and RASTER)
Pixel_in_current_screen = Pixel_in_screen_layered;
Pixel_in_current_screen_with_preview = Pixel_in_screen_layered_with_preview;
}

17
src/pages.c
View File

@ -203,7 +203,8 @@ void Redraw_layered_image(void)
// Re-construct the image with the visible layers
byte layer=0;
// First layer
if (Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5 && Main.layers_visible & (1<<4))
if ((Main.backups->Pages->Image_mode == IMAGE_MODE_MODE5
|| Main.backups->Pages->Image_mode == IMAGE_MODE_RASTER) && Main.layers_visible & (1<<4))
{
// The raster result layer is visible: start there
// Copy it in Main_visible_image
@ -1466,6 +1467,7 @@ byte Delete_layer(T_List_of_pages *list, int layer)
return 0;
}
/// Merges the current layer onto the one below it.
byte Merge_layer()
{
@ -1479,6 +1481,7 @@ byte Merge_layer()
return Delete_layer(Main.backups,Main.current_layer);
}
void Switch_layer_mode(enum IMAGE_MODES new_mode)
{
if (new_mode == Main.backups->Pages->Image_mode)
@ -1486,18 +1489,12 @@ void Switch_layer_mode(enum IMAGE_MODES new_mode)
Main.backups->Pages->Image_mode = new_mode;
switch (new_mode)
if (new_mode != IMAGE_MODE_ANIMATION)
{
case IMAGE_MODE_MODE5:
case IMAGE_MODE_LAYERED:
default:
Update_buffers(Main.image_width, Main.image_height);
Redraw_layered_image();
break;
case IMAGE_MODE_ANIMATION:
// nothing to do.
// Eventually, we may clear the buffers to save a bit of memory...
break;
}
// TODO Eventually, in animation mode we may clear the buffers to save a bit of memory...
Update_pixel_renderer();
}

3
src/palette.c
View File

@ -345,7 +345,8 @@ void Remap_image_highlevel(byte * conversion_table)
// Remap the flatenned image view
if (Main.backups->Pages->Image_mode != IMAGE_MODE_ANIMATION
&& Main.backups->Pages->Image_mode != IMAGE_MODE_MODE5)
&& Main.backups->Pages->Image_mode != IMAGE_MODE_MODE5
&& Main.backups->Pages->Image_mode != IMAGE_MODE_RASTER)
{
Remap_general_lowlevel(conversion_table,Main.visible_image.Image,Main.visible_image.Image,
Main.image_width,Main.image_height,Main.image_width);