/**
* Apply the Scale effect on a bitmap.
* This function is simply a common interface for ::scale2x(), ::scale3x() and ::scale4x().
* \param scale Scale factor. 2, 3 or 4.
* \param void_dst Pointer at the first pixel of the destination bitmap.
* \param dst_slice Size in bytes of a destination bitmap row.
* \param void_src Pointer at the first pixel of the source bitmap.
* \param src_slice Size in bytes of a source bitmap row.
* \param pixel Bytes per pixel of the source and destination bitmap.
* \param width Horizontal size in pixels of the source bitmap.
* \param height Vertical size in pixels of the source bitmap.
*/
void scale(unsigned scale, void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
{
switch (scale) {
case 2 : scale2x(void_dst, dst_slice, void_src, src_slice, pixel, width, height); break;
case 3 : scale3x(void_dst, dst_slice, void_src, src_slice, pixel, width, height); break;
case 4 : scale4x(void_dst, dst_slice, void_src, src_slice, pixel, width, height); break;
}
}
/**
* Apply the Scale effect on a bitmap.
* This function is simply a common interface for ::scale2x(), ::scale3x() and ::scale4x().
* \param scale Scale factor. 2, 203 (fox 2x3), 204 (for 2x4), 3 or 4.
* \param void_dst Pointer at the first pixel of the destination bitmap.
* \param dst_slice Size in bytes of a destination bitmap row.
* \param void_src Pointer at the first pixel of the source bitmap.
* \param src_slice Size in bytes of a source bitmap row.
* \param pixel Bytes per pixel of the source and destination bitmap.
* \param width Horizontal size in pixels of the source bitmap.
* \param height Vertical size in pixels of the source bitmap.
*/
void scale(unsigned scale, void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned width, unsigned height)
{
switch (scale) {
case 202 :
case 2 :
scale2x(void_dst, dst_slice, void_src, src_slice, width, height);
break;
case 203 :
scale2x3(void_dst, dst_slice, void_src, src_slice, 4, width, height);
break;
case 204 :
scale2x4(void_dst, dst_slice, void_src, src_slice, 4, width, height);
break;
case 303 :
case 3 :
scale3x(void_dst, dst_slice, void_src, src_slice, width, height);
break;
case 404 :
case 4 :
scale4x(void_dst, dst_slice, void_src, src_slice, width, height);
break;
}
}
void drawPNG() {
double h = gHeight;
double w = gWidth;
glClearColor(0.0, 0.0, 0.0, 0.0);
double max;
if (gHeight > gWidth) {
max = gHeight;
} else {
max = gWidth;
}
/*
* This is for pressing the key '1'. It renders the png image as it is.
* It can be blown up to whatever size the user desires, and the pixels/pixel
* size will be scaled accordingly with no algorithm attempted to depixel the
* png image.
*
*/
if (gDrawMode == 1) {
glClearColor(0.0, 0.0, 0.0, 0.0);
double pointSize = int(yRes/h) + 1.0;
glPointSize(pointSize);
glBegin(GL_POINTS);
glVertex3f(0.95,-0.95,0);
for(int y=0; y<h; y++) {
for (int x = 0; x < gWidth; x ++) {
int index = 4 * x + (4 * w * y);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0) ;
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max, -1 + (pointSize / yRes)+ 2*y/max, 0);
}
}
glEnd();
}
/*
* This is for pressing the key '2'. It renders the png image using the EPX algorithm. Basically,
* we break down each pixel into a 2x2 (so 4 pixels). If two same-color pixels of the original
* png image are adjacent to a pixel of the original png image such that the three pixels form
* a 90 degree angle, then the corresponding pixel in the blown up 2x2 is that color as well. So,
* for example, let's say that pixel A and pixel B are the same color white such that pixel A
* is adjacently above pixel C and pixel B is adjacently to the right of pixel C. We then blow up
* pixel C into a 2x2 set of pixels. Since pixels A and B are above and right of pixel C, we would
* then render the top right pixel of the 2x2 with the same color, white. This is essentially the
* EPX algorithm.
*
*/
else if (gDrawMode == 2) {
glClearColor(0.0, 0.0, 0.0, 0.0);
double pointSize = round(0.5 * yRes/h + 0.5);
glPointSize(pointSize);
glBegin(GL_POINTS);
glVertex3f(0.95,-0.95,0);
for(int y=0; y<h; y++) {
for (int x = 0; x < gWidth; x ++) {
int index = 4 * x + (4 * w * y);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0) ;
int upIndex = getUpNeighbor(x,y, gWidth, gHeight);
int downIndex = getDownNeighbor(x,y, gWidth, gHeight);
int leftIndex = getLeftNeighbor(x,y, gWidth, gHeight);
int rightIndex = getRightNeighbor(x,y, gWidth, gHeight);
// this is for the corner cases
if ((upIndex == -1 && leftIndex == -1) ||
(upIndex == -1 && rightIndex == -1) ||
(downIndex == -1 && leftIndex == -1) ||
(downIndex == -1 && rightIndex == -1))
{
// bottom-left pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max, -1 + (pointSize / yRes)+ 2*y/max, 0);
// bottom-right pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max + 2*pointSize/xRes, -1 + (pointSize / yRes)+ 2*y/max , 0);
// top-left pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max, -1 + (pointSize / yRes)+ 2*y/max + 2*pointSize/yRes, 0);
// top-right pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max + 2*pointSize/xRes, -1 + (pointSize / yRes)+ 2*y/max + 2*pointSize/yRes, 0);
}
else
{
Vec3 up, down, left, right;
up.x = gData[upIndex];
up.y = gData[upIndex+1];
up.z = gData[upIndex+2];
down.x = gData[downIndex];
down.y = gData[downIndex+1];
down.z = gData[downIndex+2];
right.x = gData[rightIndex];
right.y = gData[rightIndex+1];
right.z = gData[rightIndex+2];
left.x = gData[leftIndex];
left.y = gData[leftIndex+1];
left.z = gData[leftIndex+2];
bool upLeft = (up == left);
bool upRight = (up == right);
bool downLeft = (down == left);
bool downRight = (down == right);
//std::cout << upLeft << std::endl;
//std::cout << upRight << std::endl;
//std::cout << downLeft << std::endl;
//std::cout << downRight << std::endl;
if (downLeft) {
glColor4d(down.x / 256.0, down.y / 256.0, down.z / 256.0, int(gData[downIndex+3]) / 256.0);
}
// bottom-left pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max, -1 + (pointSize / yRes)+ 2*y/max, 0);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0);
if (downRight) {
glColor4d(down.x / 256.0, down.y / 256.0, down.z / 256.0, int(gData[downIndex+3]) / 256.0);
}
// bottom-right pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max + 2*pointSize/xRes, -1 + (pointSize / yRes)+ 2*y/max , 0);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0);
if (upLeft) {
glColor4d(up.x / 256.0, up.y / 256.0, up.z / 256.0, int(gData[upIndex+3]) / 256.0);
}
// top-left pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max, -1 + (pointSize / yRes)+ 2*y/max + 2*pointSize/yRes, 0);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0);
if (upRight) {
glColor4d(up.x / 256.0, up.y / 256.0, up.z / 256.0, int(gData[downIndex+3]) / 256.0);
}
// top-right pixel of the 2x2
glVertex3f(-1 + (pointSize / xRes) + 2*(x)/max + 2*pointSize/xRes, -1 + (pointSize / yRes)+ 2*y/max + 2*pointSize/yRes, 0);
glColor4d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0, int(gData[index+3]) / 256.0);
}
}
}
glEnd();
}
// glDrawPixels, no EPX, just regular image
else if (gDrawMode == 3) {
glClearColor(0.0, 0.0, 0.0, 0.0);
glColor3f(0.0f, 0.0f, 0.0f);
//GLubyte color[2][2][4];
GLubyte color[gHeight][gWidth][4];
for(int y = 0; y < gHeight; y++) {
for (int x = 0; x < gWidth; x ++) {
int index = 4 * x + (4 * w * y);
color[y][x][0] = int(gData[index]);
color[y][x][1] = int(gData[index+1]);
color[y][x][2] = int(gData[index+2]);
color[y][x][3] = int(gData[index+3]);
//std::cout << "X: " << x/3 << " Y: " << y << " rgb: " << int(gData[index]) << " " << int(gData[index + 1]) << " " << int(gData[index+2]) << std::endl;
//glColor3d(int(gData[index]) / 256.0, int(gData[index+1]) / 256.0, int(gData[index+2]) / 256.0);
//glVertex3f(-1 + (pointSize / xRes) + 2*(x/3)/max, -1 + (pointSize / yRes)+ 2*y/max, 0);
}
}
//GLfloat scaleX = 1.0f * xRes / 2;
//GLfloat scaleY = 1.0f * yRes / 2;
//std::cout << scaleX << " " << scaleY << std::endl;
//glPixelZoom(scaleX/15.99, scaleY/15.99);
glPixelZoom(floor(xRes/max), floor(yRes/max));
//glPixelZoom(5,5);
glRasterPos2d(-1.0, -1.0);
glClear(GL_COLOR_BUFFER_BIT);
glDrawPixels( gWidth, gHeight, GL_RGBA, GL_UNSIGNED_BYTE, color );
glFlush();
}
/* EPX algorithm with gldrawPixels */
else if (gDrawMode == 4) {
epx(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* scale2x algorithm with gldrawPixels */
else if (gDrawMode == 5) {
scale2x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* scale3x algorithm with gldrawPixels */
else if (gDrawMode == 6) {
scale3x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* scale4x algorithm with gldrawPixels */
else if (gDrawMode == 7) {
scale4x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* eagle algorithm with gldrawPixels */
else if (gDrawMode == 8) {
eagle(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* bilinear interpolation! */
else if (gDrawMode == 9) {
bilinear2x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* bicubic interpolation! */
else if (gDrawMode == 10) {
bicubic2x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
/* eagle3x! */
else if (gDrawMode == 11) {
eagle3x(gHeight, gWidth, h, w, xRes, yRes, max, gData);
}
// no matter what draw mode, draw nearest neighbor on the right side
// Set matrix mode
glMatrixMode(GL_PROJECTION);
// push current projection matrix on the matrix stack
glPushMatrix();
// Set an ortho projection based on window size
glLoadIdentity();
glOrtho(0, xRes * 2, 0, yRes, 0, 1);
// Switch back to model-view matrix
glMatrixMode(GL_MODELVIEW);
// Store current model-view matrix on the stack
glPushMatrix();
// Clear the model-view matrix
glLoadIdentity();
// You can specify this in window coordinates now
glRasterPos2i(2*xRes,0);
glPixelZoom(floor(xRes/max), floor(yRes/max));
glDrawPixels(gWidth, gHeight, GL_RGBA, GL_UNSIGNED_BYTE, gData);
// Restore the model-view matrix
glPopMatrix();
// Switch to projection matrix and restore it
glMatrixMode(GL_PROJECTION);
glPopMatrix();
}