// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
package org.cef.browser;
import org.cef.CefApp;
import javax.media.opengl.GL2;
import java.awt.*;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
class CefRenderer {
private boolean transparent_;
private GL2 initialized_context_ = null;
private int[] texture_id_ = new int[1];
private int view_width_ = 0;
private int view_height_ = 0;
private float spin_x_ = 0f;
private float spin_y_ = 0f;
private Rectangle popup_rect_ = new Rectangle(0, 0, 0, 0);
private Rectangle original_popup_rect_ = new Rectangle(0, 0, 0, 0);
private boolean use_draw_pixels_ = false;
protected CefRenderer(boolean transparent) {
transparent_ = transparent;
}
protected boolean isTransparent() {
return transparent_;
}
@SuppressWarnings("static-access")
protected void initialize(GL2 gl2) {
if (initialized_context_ == gl2) {
return;
}
initialized_context_ = gl2;
if (!gl2.getContext().isHardwareRasterizer()) {
// Workaround for Windows Remote Desktop which requires pot textures.
CefApp.getLogger().info("opengl rendering may be slow as hardware rendering isn't available");
use_draw_pixels_ = true;
return;
}
gl2.glHint(gl2.GL_POLYGON_SMOOTH_HINT, gl2.GL_NICEST);
gl2.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Necessary for non-power-of-2 textures to render correctly.
gl2.glPixelStorei(gl2.GL_UNPACK_ALIGNMENT, 1);
// Create the texture.
gl2.glGenTextures(1, texture_id_, 0);
assert (texture_id_[0] != 0);
gl2.glBindTexture(gl2.GL_TEXTURE_2D, texture_id_[0]);
gl2.glTexParameteri(gl2.GL_TEXTURE_2D, gl2.GL_TEXTURE_MIN_FILTER, gl2.GL_NEAREST);
gl2.glTexParameteri(gl2.GL_TEXTURE_2D, gl2.GL_TEXTURE_MAG_FILTER, gl2.GL_NEAREST);
gl2.glTexEnvf(gl2.GL_TEXTURE_ENV, gl2.GL_TEXTURE_ENV_MODE, gl2.GL_MODULATE);
}
protected void cleanup(GL2 gl2) {
if (texture_id_[0] != 0) {
gl2.glDeleteTextures(1, texture_id_, 0);
}
}
@SuppressWarnings("static-access")
protected void render(GL2 gl2) {
if (use_draw_pixels_ || view_width_ == 0 || view_height_ == 0) {
return;
}
assert (initialized_context_ != null);
final float[] vertex_data = {
//tu, tv, x, y, z
0.0f, 1.0f, -1.0f, -1.0f, 0.0f, 1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f };
FloatBuffer vertices = FloatBuffer.wrap(vertex_data);
gl2.glClear(gl2.GL_COLOR_BUFFER_BIT | gl2.GL_DEPTH_BUFFER_BIT);
gl2.glMatrixMode(gl2.GL_MODELVIEW);
gl2.glLoadIdentity();
// Match GL units to screen coordinates.
gl2.glViewport(0, 0, view_width_, view_height_);
gl2.glMatrixMode(gl2.GL_PROJECTION);
gl2.glLoadIdentity();
// Draw the background gradient.
gl2.glPushAttrib(gl2.GL_ALL_ATTRIB_BITS);
gl2.glBegin(gl2.GL_QUADS);
gl2.glColor4f(1.0f, 0.0f, 0.0f, 1.0f); // red
gl2.glVertex2f(-1.0f, -1.0f);
gl2.glVertex2f(1.0f, -1.0f);
gl2.glColor4f(0.0f, 0.0f, 1.0f, 1.0f); // blue
gl2.glVertex2f(1.0f, 1.0f);
gl2.glVertex2f(-1.0f, 1.0f);
gl2.glEnd();
gl2.glPopAttrib();
// Rotate the view based on the mouse spin.
if (spin_x_ != 0) {
gl2.glRotatef(-spin_x_, 1.0f, 0.0f, 0.0f);
}
if (spin_y_ != 0) {
gl2.glRotatef(-spin_y_, 0.0f, 1.0f, 0.0f);
}
if (transparent_) {
// Alpha blending style. Texture values have premultiplied alpha.
gl2.glBlendFunc(gl2.GL_ONE, gl2.GL_ONE_MINUS_SRC_ALPHA);
// Enable alpha blending.
gl2.glEnable(gl2.GL_BLEND);
}
// Enable 2D textures.
gl2.glEnable(gl2.GL_TEXTURE_2D);
// Draw the facets with the texture.
assert (texture_id_[0] != 0);
gl2.glBindTexture(gl2.GL_TEXTURE_2D, texture_id_[0]);
gl2.glInterleavedArrays(gl2.GL_T2F_V3F, 0, vertices);
gl2.glDrawArrays(gl2.GL_QUADS, 0, 4);
// Disable 2D textures.
gl2.glDisable(gl2.GL_TEXTURE_2D);
if (transparent_) {
// Disable alpha blending.
gl2.glDisable(gl2.GL_BLEND);
}
}
protected void onPopupSize(Rectangle rect) {
if (rect.width <= 0 || rect.height <= 0) {
return;
}
original_popup_rect_ = rect;
popup_rect_ = getPopupRectInWebView(original_popup_rect_);
}
protected Rectangle getPopupRect() {
return (Rectangle) popup_rect_.clone();
}
protected Rectangle getPopupRectInWebView(Rectangle original_rect) {
Rectangle rc = original_rect;
// if x or y are negative, move them to 0.
if (rc.x < 0) {
rc.x = 0;
}
if (rc.y < 0) {
rc.y = 0;
}
// if popup goes outside the view, try to reposition origin
if (rc.x + rc.width > view_width_) {
rc.x = view_width_ - rc.width;
}
if (rc.y + rc.height > view_height_) {
rc.y = view_height_ - rc.height;
}
// if x or y became negative, move them to 0 again.
if (rc.x < 0) {
rc.x = 0;
}
if (rc.y < 0) {
rc.y = 0;
}
return rc;
}
protected void clearPopupRects() {
popup_rect_.setBounds(0, 0, 0, 0);
original_popup_rect_.setBounds(0, 0, 0, 0);
}
@SuppressWarnings("static-access")
protected void onPaint(GL2 gl2, boolean popup, Rectangle[] dirtyRects, ByteBuffer buffer, int width, int height) {
initialize(gl2);
if (use_draw_pixels_) {
gl2.glRasterPos2f(-1, 1);
gl2.glPixelZoom(1, -1);
gl2.glDrawPixels(width, height, GL2.GL_BGRA, GL2.GL_UNSIGNED_BYTE, buffer);
return;
}
if (transparent_) {
// Enable alpha blending.
gl2.glEnable(gl2.GL_BLEND);
}
// Enable 2D textures.
gl2.glEnable(gl2.GL_TEXTURE_2D);
assert (texture_id_[0] != 0);
gl2.glBindTexture(gl2.GL_TEXTURE_2D, texture_id_[0]);
if (!popup) {
int old_width = view_width_;
int old_height = view_height_;
view_width_ = width;
view_height_ = height;
gl2.glPixelStorei(gl2.GL_UNPACK_ROW_LENGTH, view_width_);
if (old_width != view_width_ || old_height != view_height_) {
// Update/resize the whole texture.
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_PIXELS, 0);
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_ROWS, 0);
gl2.glTexImage2D(gl2.GL_TEXTURE_2D, 0, gl2.GL_RGBA, view_width_, view_height_, 0, gl2.GL_BGRA, gl2.GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
}
else {
// Update just the dirty rectangles.
for (int i = 0; i < dirtyRects.length; ++i) {
Rectangle rect = dirtyRects[i];
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_PIXELS, rect.x);
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_ROWS, rect.y);
gl2.glTexSubImage2D(gl2.GL_TEXTURE_2D, 0, rect.x, rect.y, rect.width, rect.height, gl2.GL_BGRA, gl2.GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
}
}
}
else if (popup && popup_rect_.width > 0 && popup_rect_.height > 0) {
int skip_pixels = 0, x = popup_rect_.x;
int skip_rows = 0, y = popup_rect_.y;
int w = width;
int h = height;
// Adjust the popup to fit inside the view.
if (x < 0) {
skip_pixels = -x;
x = 0;
}
if (y < 0) {
skip_rows = -y;
y = 0;
}
if (x + w > view_width_) {
w -= x + w - view_width_;
}
if (y + h > view_height_) {
h -= y + h - view_height_;
}
// Update the popup rectangle.
gl2.glPixelStorei(gl2.GL_UNPACK_ROW_LENGTH, width);
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_PIXELS, skip_pixels);
gl2.glPixelStorei(gl2.GL_UNPACK_SKIP_ROWS, skip_rows);
gl2.glTexSubImage2D(gl2.GL_TEXTURE_2D, 0, x, y, w, h, gl2.GL_BGRA, gl2.GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
}
// Disable 2D textures.
gl2.glDisable(gl2.GL_TEXTURE_2D);
if (transparent_) {
// Disable alpha blending.
gl2.glDisable(gl2.GL_BLEND);
}
}
protected void setSpin(float spinX, float spinY) {
spin_x_ = spinX;
spin_y_ = spinY;
}
protected void incrementSpin(float spinDX, float spinDY) {
spin_x_ -= spinDX;
spin_y_ -= spinDY;
}
}
