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Added the capability to generate multicolor sprites.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5606 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2012-03-11 12:17:48 +00:00
parent 4a0a76b012
commit b599fe5793
1 changed files with 85 additions and 17 deletions
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102
src/sp65/vic2sprite.c
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@ -38,6 +38,7 @@
#include "print.h"
/* sp65 */
#include "attr.h"
#include "error.h"
#include "vic2sprite.h"
@ -49,9 +50,17 @@
/* Sprite mode */
enum Mode {
smAuto,
smHighRes,
smMultiColor
};
/* Screen size of a koala picture */
#define WIDTH 24U
#define HEIGHT 21U
#define WIDTH_HR 24U
#define WIDTH_MC 12U
#define HEIGHT 21U
@ -61,12 +70,33 @@
StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A attribute ((unused)))
static enum Mode GetMode (const Collection* A)
/* Return the sprite mode from the attribute collection A */
{
/* Check for a mode attribute */
const char* Mode = GetAttrVal (A, "mode");
if (Mode) {
if (strcmp (Mode, "highres") == 0) {
return smHighRes;
} else if (strcmp (Mode, "multicolor") == 0) {
return smMultiColor;
} else {
Error ("Invalid value for attribute `mode'");
}
} else {
return smAuto;
}
}
StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A)
/* Generate binary output in VICII sprite format for the bitmap B. The output
* is stored in a string buffer (which is actually a dynamic char array) and
* returned.
*/
{
enum Mode M;
StrBuf* D;
unsigned X, Y;
@ -76,14 +106,38 @@ StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A attribute ((unused))
GetBitmapWidth (B), GetBitmapHeight (B), GetBitmapColors (B),
BitmapIsIndexed (B)? " (indexed)" : "");
/* Sprites pictures are always 24x21 in size with 2 colors */
if (!BitmapIsIndexed (B) ||
GetBitmapColors (B) != 2 ||
GetBitmapHeight (B) != HEIGHT ||
GetBitmapWidth (B) != WIDTH) {
/* Get the sprite mode */
M = GetMode (A);
Error ("Bitmaps converted to vic2 sprite format must be in indexed "
"mode with a size of %ux%u and two colors", WIDTH, HEIGHT);
/* Check the height of the bitmap */
if (GetBitmapHeight (B) != HEIGHT) {
Error ("Invalid bitmap height (%u) for conversion to vic2 sprite",
GetBitmapHeight (B));
}
/* If the mode wasn't given, determine it from the image properties */
if (M == smAuto) {
switch (GetBitmapWidth (B)) {
case WIDTH_HR:
M = smHighRes;
break;
case WIDTH_MC:
M = smMultiColor;
break;
default:
Error ("Cannot determine mode from image properties");
}
}
/* Now check if mode and the image properties match */
if (M == smMultiColor) {
if (GetBitmapWidth (B) != WIDTH_MC || GetBitmapColors (B) > 4) {
Error ("Invalid image properties for multicolor sprite");
}
} else {
if (GetBitmapWidth (B) != WIDTH_HR || GetBitmapColors (B) > 2) {
Error ("Invalid image properties for highres sprite");
}
}
/* Create the output buffer and resize it to the required size. */
@ -93,15 +147,29 @@ StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A attribute ((unused))
/* Convert the image */
for (Y = 0; Y < HEIGHT; ++Y) {
unsigned char V = 0;
for (X = 0; X < WIDTH; ++X) {
if (M == smHighRes) {
for (X = 0; X < WIDTH_HR; ++X) {
/* Fetch next bit into byte buffer */
V = (V << 1) | (GetPixel (B, X, Y).Index != 0);
/* Fetch next bit into byte buffer */
V = (V << 1) | (GetPixel (B, X, Y).Index & 0x01);
/* Store full bytes into the output buffer */
if ((X & 0x07) == 0x07) {
SB_AppendChar (D, V);
V = 0;
/* Store full bytes into the output buffer */
if ((X & 0x07) == 0x07) {
SB_AppendChar (D, V);
V = 0;
}
}
} else {
for (X = 0; X < WIDTH_MC; ++X) {
/* Fetch next bit into byte buffer */
V = (V << 2) | (GetPixel (B, X, Y).Index & 0x03);
/* Store full bytes into the output buffer */
if ((X & 0x03) == 0x03) {
SB_AppendChar (D, V);
V = 0;
}
}
}
}