cleanup / added comments / code unification
svn-id: r8235
This commit is contained in:
Max Horn
parent
a29074ed08
commit
9cbcde684b
6 changed files with 92 additions and 105 deletions
150
scumm/bomp.cpp
150
scumm/bomp.cpp
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@ -28,7 +28,6 @@ static void bompScaleFuncX(byte *line_buffer, byte *scaling_x_ptr, byte skip, in
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static void bompDecodeLineReverse(byte *dst, const byte *src, int size);
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static void bompApplyMask(byte *line_buffer, byte *mask_out, byte maskbit, int32 size);
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static void bompApplyShadow0(const byte *line_buffer, byte *dst, int32 size, byte transparency);
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static void bompApplyShadow1(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency);
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static void bompApplyShadow3(const byte *shadowPalette, const byte *line_buffer, byte *dst, int32 size, byte transparency);
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@ -97,13 +96,13 @@ void bompDecodeLineReverse(byte *dst, const byte *src, int size) {
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}
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}
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void bompApplyMask(byte *line_buffer, byte *mask, byte maskbit, int32 size) {
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void bompApplyMask(byte *line_buffer, byte *mask, byte maskbit, int32 size, byte transparency) {
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while(1) {
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do {
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if (size-- == 0)
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return;
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if (*mask & maskbit) {
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*line_buffer = 255;
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*line_buffer = transparency;
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}
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line_buffer++;
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maskbit >>= 1;
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@ -176,35 +175,37 @@ void bompApplyActorPalette(byte *actorPalette, byte *line_buffer, int32 size) {
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}
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void bompScaleFuncX(byte *line_buffer, byte *scaling_x_ptr, byte skip, int32 size) {
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byte * line_ptr1 = line_buffer;
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byte * line_ptr2 = line_buffer;
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byte *line_ptr1 = line_buffer;
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byte *line_ptr2 = line_buffer;
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byte tmp = *(scaling_x_ptr++);
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byte tmp = *scaling_x_ptr++;
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while (size--) {
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if ((skip & tmp) == 0) {
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*(line_ptr1++) = *(line_ptr2);
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*line_ptr1++ = *line_ptr2;
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}
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line_ptr2++;
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skip >>= 1;
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if (skip == 0) {
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skip = 128;
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tmp = *(scaling_x_ptr++);
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tmp = *scaling_x_ptr++;
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}
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}
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}
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void Scumm::drawBomp(const BompDrawData &bd, int decode_mode, int mask) {
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byte skip_y = 128;
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byte skip_y_new = 0;
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byte maskbit;
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byte *mask_out = 0;
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byte *charset_mask;
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byte tmp;
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void Scumm::drawBomp(const BompDrawData &bd, bool mirror) {
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const byte *src;
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byte *dst;
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int32 clip_left, clip_right, clip_top, clip_bottom, tmp_x, tmp_y, mask_offset;
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byte maskbit;
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byte *mask = 0;
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int mask_offset;
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byte *charset_mask;
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int clip_left, clip_right, clip_top, clip_bottom;
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byte *scalingYPtr = bd.scalingYPtr;
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byte skip_y_bits = 0x80;
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byte skip_y_new = 0;
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byte tmp;
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if (bd.x < 0) {
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clip_left = -bd.x;
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@ -219,44 +220,50 @@ void Scumm::drawBomp(const BompDrawData &bd, int decode_mode, int mask) {
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}
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clip_right = bd.srcwidth;
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tmp_x = bd.x + bd.srcwidth;
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if (tmp_x > bd.outwidth) {
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clip_right -= tmp_x - bd.outwidth;
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if (clip_right > bd.outwidth - bd.x) {
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clip_right = bd.outwidth - bd.x;
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}
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clip_bottom = bd.srcheight;
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tmp_y = bd.y + bd.srcheight;
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if (tmp_y > bd.outheight) {
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clip_bottom -= tmp_y - bd.outheight;
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if (clip_bottom > bd.outheight - bd.y) {
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clip_bottom = bd.outheight - bd.y;
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}
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src = bd.dataptr;
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dst = bd.out + bd.y * bd.outwidth + bd.x + clip_left;
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mask_offset = _screenStartStrip + (bd.y * gdi._numStrips) + ((bd.x + clip_left) >> 3);
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charset_mask = getResourceAddress(rtBuffer, 9) + mask_offset;
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maskbit = revBitMask[(bd.x + clip_left) & 7];
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if (mask == 1) {
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mask_out = bd.maskPtr + mask_offset;
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// Always mask against the charset mask
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charset_mask = getResourceAddress(rtBuffer, 9) + mask_offset;
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// Also mask against any additionally imposed mask
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if (bd.maskPtr) {
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mask = bd.maskPtr + mask_offset;
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}
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if (mask == 3) {
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if (scalingYPtr != NULL) {
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skip_y_new = *(scalingYPtr++);
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}
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// Setup vertical scaling
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if (bd.scale_y != 255) {
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assert(scalingYPtr);
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if (clip_right > bd.scaleRight) {
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clip_right = bd.scaleRight;
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}
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skip_y_new = *scalingYPtr++;
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skip_y_bits = 0x80;
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if (clip_bottom > bd.scaleBottom) {
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clip_bottom = bd.scaleBottom;
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}
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}
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int width = clip_right - clip_left;
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// Setup horizontal scaling
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if (bd.scale_x != 255) {
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assert(bd.scalingXPtr);
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if (clip_right > bd.scaleRight) {
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clip_right = bd.scaleRight;
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}
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}
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const int width = clip_right - clip_left;
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if (width <= 0)
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return;
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@ -266,58 +273,59 @@ void Scumm::drawBomp(const BompDrawData &bd, int decode_mode, int mask) {
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byte *line_ptr = line_buffer + clip_left;
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// Loop over all lines
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while (pos_y < clip_bottom) {
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switch(decode_mode) {
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case 0:
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memcpy(line_buffer, src, bd.srcwidth);
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src += bd.srcwidth;
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break;
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case 1:
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bompDecodeLine(line_buffer, src + 2, bd.srcwidth);
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src += READ_LE_UINT16(src) + 2;
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break;
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case 3:
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// Decode a single (bomp encoded) line, reversed if we are in mirror mode
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if (mirror)
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bompDecodeLineReverse(line_buffer, src + 2, bd.srcwidth);
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src += READ_LE_UINT16(src) + 2;
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break;
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default:
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error("Unknown bomp decode_mode %d", decode_mode);
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}
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else
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bompDecodeLine(line_buffer, src + 2, bd.srcwidth);
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src += READ_LE_UINT16(src) + 2;
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if (mask == 3) {
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if (bd.scale_y != 255) {
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tmp = skip_y_new & skip_y;
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skip_y >>= 1;
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if (skip_y == 0) {
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skip_y = 128;
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skip_y_new = *(scalingYPtr++);
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}
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if (tmp != 0)
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continue;
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// If vertical scaling is enabled, do it
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if (bd.scale_y != 255) {
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// A bit set means we should skip this line...
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tmp = skip_y_new & skip_y_bits;
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// Advance the scale-skip bit mask, if it's 0, get the next scale-skip byte
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skip_y_bits >>= 1;
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if (skip_y_bits == 0) {
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skip_y_bits = 0x80;
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skip_y_new = *scalingYPtr++;
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}
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if (bd.scale_x != 255) {
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bompScaleFuncX(line_buffer, bd.scalingXPtr, 128, bd.srcwidth);
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}
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// Skip the current line if the above check tells us to
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if (tmp != 0)
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continue;
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}
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// Perform horizontal scaling
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if (bd.scale_x != 255) {
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bompScaleFuncX(line_buffer, bd.scalingXPtr, 0x80, bd.srcwidth);
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}
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// The first clip_top lines are to be clipped, i.e. not drawn
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if (clip_top > 0) {
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clip_top--;
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} else {
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if (mask == 1) {
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bompApplyMask(line_ptr, mask_out, maskbit, width);
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}
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// Replace the parts of the line which are masked with the transparency color
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if (bd.maskPtr)
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bompApplyMask(line_ptr, mask, maskbit, width, 255);
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bompApplyMask(line_ptr, charset_mask, maskbit, width, 255);
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bompApplyMask(line_ptr, charset_mask, maskbit, width);
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bompApplyActorPalette(_bompActorPalettePtr, line_ptr, width);
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// Apply custom color map, if available
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if (_bompActorPalettePtr)
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bompApplyActorPalette(_bompActorPalettePtr, line_ptr, width);
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// Finally, draw the decoded, scaled, masked and recolored line onto
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// the target surface, using the specified shadow mode
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bompApplyShadow(bd.shadowMode, _shadowPalette, line_ptr, dst, width, 255);
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}
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mask_out += gdi._numStrips;
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charset_mask += gdi._numStrips;
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// Advance to the next line
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pos_y++;
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mask += gdi._numStrips;
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charset_mask += gdi._numStrips;
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dst += bd.outwidth;
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}
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}
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